{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-23277", "tracking": { "current_release_date": "2026-03-28T12:20:02.392331Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-23277", "initial_release_date": "2026-03-20T18:28:00.438291Z", "revision_history": [ { "date": "2026-03-20T18:28:00.438291Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products created (3).| Products connected (5).| References created (3)." }, { "date": "2026-03-20T18:28:09.599952Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:28:42.394984Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (3)." }, { "date": "2026-03-20T18:32:36.733430Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (11)." }, { "date": "2026-03-20T18:32:39.712632Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:44:40.285864Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-20T18:44:44.343943Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-20T22:18:34.918782Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T22:18:44.999438Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-21T00:27:47.584923Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (13).| Product Identifiers created (5).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-21T00:27:54.365171Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-21T06:43:45.977432Z", "number": "12", "summary": "Description created for source." }, { "date": "2026-03-21T12:20:02.948207Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1)." }, { "date": "2026-03-21T12:20:06.830459Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-25T10:40:28.985884Z", "number": "15", "summary": "Products created (3).| Products connected (3).| References created (3)." }, { "date": "2026-03-25T10:40:36.887173Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-25T11:28:16.868899Z", "number": "17", "summary": "References created (3)." }, { "date": "2026-03-28T12:19:58.807363Z", "number": "18", "summary": "Product Remediations created (1)." }, { "date": "2026-03-28T12:20:01.467471Z", "number": "19", "summary": "NCSC Score updated." } ], "status": "interim", "version": "19" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/039f50629b7f860f36644ed1f34b27da9aa62f43|<0bad9c86edd22dec4df83c2b29872d66fd8a2ff4", "product": { "name": 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Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1453379" } } ], "category": "product_name", "name": "kernel" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1453380" } } ], "category": "product_name", "name": "kernel-rt" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1453381" } } ], "category": "product_name", "name": "kernel" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1453382" } } ], "category": "product_name", "name": "kernel-rt" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5761981", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_kernel_6.6.126.1-1:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 kernel 6.6.126.1-1 on Azure Linux 3.0" } ], "category": "product_family", "name": "Open Source Software" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2036024" } } ], "category": "product_name", "name": "linux" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2036021" } } ], "category": "product_name", "name": "linux" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-23277", "cwe": { "id": "CWE-476", "name": "NULL Pointer Dereference" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit\n\nteql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit\nthrough slave devices, but does not update skb->dev to the slave device\nbeforehand.\n\nWhen a gretap tunnel is a TEQL slave, the transmit path reaches\niptunnel_xmit() which saves dev = skb->dev (still pointing to teql0\nmaster) and later calls iptunnel_xmit_stats(dev, pkt_len). This\nfunction does:\n\n get_cpu_ptr(dev->tstats)\n\nSince teql_master_setup() does not set dev->pcpu_stat_type to\nNETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats\nfor teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes\nNULL + __per_cpu_offset[cpu], resulting in a page fault.\n\n BUG: unable to handle page fault for address: ffff8880e6659018\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 68bc067 P4D 68bc067 PUD 0\n Oops: Oops: 0002 [#1] SMP KASAN PTI\n RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89)\n Call Trace:\n \n ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847)\n __gre_xmit (net/ipv4/ip_gre.c:478)\n gre_tap_xmit (net/ipv4/ip_gre.c:779)\n teql_master_xmit (net/sched/sch_teql.c:319)\n dev_hard_start_xmit (net/core/dev.c:3887)\n sch_direct_xmit (net/sched/sch_generic.c:347)\n __dev_queue_xmit (net/core/dev.c:4802)\n neigh_direct_output (net/core/neighbour.c:1660)\n ip_finish_output2 (net/ipv4/ip_output.c:237)\n __ip_finish_output.part.0 (net/ipv4/ip_output.c:315)\n ip_mc_output (net/ipv4/ip_output.c:369)\n ip_send_skb (net/ipv4/ip_output.c:1508)\n udp_send_skb (net/ipv4/udp.c:1195)\n udp_sendmsg (net/ipv4/udp.c:1485)\n inet_sendmsg (net/ipv4/af_inet.c:859)\n __sys_sendto (net/socket.c:2206)\n\nFix this by setting skb->dev = slave before calling\nnetdev_start_xmit(), so that tunnel xmit functions see the correct\nslave device with properly allocated tstats.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23277.json" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit\n\nteql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit\nthrough slave devices, but does not update skb->dev to the slave device\nbeforehand.\n\nWhen a gretap tunnel is a TEQL slave, the transmit path reaches\niptunnel_xmit() which saves dev = skb->dev (still pointing to teql0\nmaster) and later calls iptunnel_xmit_stats(dev, pkt_len). This\nfunction does:\n\n get_cpu_ptr(dev->tstats)\n\nSince teql_master_setup() does not set dev->pcpu_stat_type to\nNETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats\nfor teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes\nNULL + __per_cpu_offset[cpu], resulting in a page fault.\n\n BUG: unable to handle page fault for address: ffff8880e6659018\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 68bc067 P4D 68bc067 PUD 0\n Oops: Oops: 0002 [#1] SMP KASAN PTI\n RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89)\n Call Trace:\n \n ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847)\n __gre_xmit (net/ipv4/ip_gre.c:478)\n gre_tap_xmit (net/ipv4/ip_gre.c:779)\n teql_master_xmit (net/sched/sch_teql.c:319)\n dev_hard_start_xmit (net/core/dev.c:3887)\n sch_direct_xmit (net/sched/sch_generic.c:347)\n __dev_queue_xmit (net/core/dev.c:4802)\n neigh_direct_output (net/core/neighbour.c:1660)\n ip_finish_output2 (net/ipv4/ip_output.c:237)\n __ip_finish_output.part.0 (net/ipv4/ip_output.c:315)\n ip_mc_output (net/ipv4/ip_output.c:369)\n ip_send_skb (net/ipv4/ip_output.c:1508)\n udp_send_skb (net/ipv4/udp.c:1195)\n udp_sendmsg (net/ipv4/udp.c:1485)\n inet_sendmsg (net/ipv4/af_inet.c:859)\n __sys_sendto (net/socket.c:2206)\n\nFix this by setting skb->dev = slave before calling\nnetdev_start_xmit(), so that tunnel xmit functions see the correct\nslave device with properly allocated tstats.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23277" }, { "category": "description", "text": "A flaw was found in the Linux kernel. A null pointer dereference vulnerability exists in the Traffic Equalizer (TEQL) module's interaction with the IP tunneling framework. When a Generic Routing Encapsulation (GRE) tap tunnel acts as a TEQL slave, the system attempts to access uninitialized statistics data, leading to a system crash. This can result in a Denial of Service (DoS).", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23277.json" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved: net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit teql_master_xmit() calls netdev_start_xmit(skb, slave) to transmit through slave devices, but does not update skb->dev to the slave device beforehand. When a gretap tunnel is a TEQL slave, the transmit path reaches iptunnel_xmit() which saves dev = skb->dev (still pointing to teql0 master) and later calls iptunnel_xmit_stats(dev, pkt_len). This function does: get_cpu_ptr(dev->tstats) Since teql_master_setup() does not set dev->pcpu_stat_type to NETDEV_PCPU_STAT_TSTATS, the core network stack never allocates tstats for teql0, so dev->tstats is NULL. get_cpu_ptr(NULL) computes NULL + __per_cpu_offset[cpu], resulting in a page fault. BUG: unable to handle page fault for address: ffff8880e6659018 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 68bc067 P4D 68bc067 PUD 0 Oops: Oops: 0002 [#1] SMP KASAN PTI RIP: 0010:iptunnel_xmit (./include/net/ip_tunnels.h:664 net/ipv4/ip_tunnel_core.c:89) Call Trace: ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847) __gre_xmit (net/ipv4/ip_gre.c:478) gre_tap_xmit (net/ipv4/ip_gre.c:779) teql_master_xmit (net/sched/sch_teql.c:319) dev_hard_start_xmit (net/core/dev.c:3887) sch_direct_xmit (net/sched/sch_generic.c:347) __dev_queue_xmit (net/core/dev.c:4802) neigh_direct_output (net/core/neighbour.c:1660) ip_finish_output2 (net/ipv4/ip_output.c:237) __ip_finish_output.part.0 (net/ipv4/ip_output.c:315) ip_mc_output (net/ipv4/ip_output.c:369) ip_send_skb (net/ipv4/ip_output.c:1508) udp_send_skb (net/ipv4/udp.c:1195) udp_sendmsg (net/ipv4/udp.c:1485) inet_sendmsg (net/ipv4/af_inet.c:859) __sys_sendto (net/socket.c:2206) Fix this by setting skb->dev = slave before calling netdev_start_xmit(), so that tunnel xmit functions see the correct slave device with properly allocated tstats.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-23277" }, { "category": "description", "text": "net/sched: teql: fix NULL pointer dereference in iptunnel\\_xmit on TEQL slave xmit", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "other", "text": "0.00017", "title": "EPSS" }, { "category": "other", "text": "4.0", "title": "NCSC Score" }, { "category": "other", "text": "VENDOR FIX as product remediation category", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to a product by vendor Linux, Is related to a product by vendor Debian, The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-1289522", "CSAFPID-5874568", "CSAFPID-5874569", "CSAFPID-5874570", "CSAFPID-1330297", "CSAFPID-2036021", "CSAFPID-2036024", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-1453376", "CSAFPID-1453377", "CSAFPID-1453378", "CSAFPID-1453379", "CSAFPID-1453380", "CSAFPID-5761981", "CSAFPID-5904910", "CSAFPID-5904911", "CSAFPID-5904912" ], "known_not_affected": [ "CSAFPID-1289523", "CSAFPID-5844856", "CSAFPID-5874533", "CSAFPID-5874534", "CSAFPID-1439319", "CSAFPID-1453381", "CSAFPID-1453382", "CSAFPID-2858634", "CSAFPID-2858635", "CSAFPID-5904647", "CSAFPID-5904654", "CSAFPID-5904671" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23277.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23277" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0809.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-23277" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23277.json" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/0bad9c86edd22dec4df83c2b29872d66fd8a2ff4" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/21ea283c2750c8307aa35ee832b0951cc993c27d" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/0cc0c2e661af418bbf7074179ea5cfffc0a5c466" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0809.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0809" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032031-CVE-2026-23271-657a@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032034-CVE-2026-23272-8ad1@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032034-CVE-2026-23273-3669@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032034-CVE-2026-23274-ba1d@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032035-CVE-2026-23275-33fe@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032035-CVE-2026-23276-7fd3@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032036-CVE-2026-23277-e478@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032036-CVE-2026-23278-4dcc@gregkh/" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-23277" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23277" }, { "category": "external", "summary": "Reference - redhat", "url": "https://lore.kernel.org/linux-cve-announce/2026032036-CVE-2026-23277-e478@gregkh/T" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/57c153249143333bbf4ecf927bdf8aa2696ee397" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/59b06d8b9bdb6b64b3c534c18da68bce5ccd31be" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/81a43e8005366f16e629d8c95dfe05beaa8d36a7" } ], "remediations": [ { "category": "vendor_fix", "details": "CBL-Mariner Releases", "product_ids": [ "CSAFPID-5761981" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.9, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1289522", "CSAFPID-1330297", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-1453376", "CSAFPID-1453377", "CSAFPID-1453378", "CSAFPID-1453379", "CSAFPID-1453380", "CSAFPID-2036021", "CSAFPID-2036024", "CSAFPID-5761981", "CSAFPID-5874568", "CSAFPID-5874569", "CSAFPID-5874570", "CSAFPID-5904910", "CSAFPID-5904911", "CSAFPID-5904912" ] } ], "title": "CVE-2026-23277" } ] }