{ "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-2026-23458", "tracking": { "current_release_date": "2026-04-03T16:54:47.979402Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-23458", "initial_release_date": "2026-04-03T15:40:44.667641Z", "revision_history": [ { "date": "2026-04-03T15:40:44.667641Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products created (6).| Products connected (8).| References created (6)." }, { "date": "2026-04-03T15:40:52.170917Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-04-03T16:49:06.062551Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (6)." } ], "status": "interim", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/e844a928431fa8f1359d1f4f2cef53d9b446bf52|<04c8907ce4e3d3e26c5e1a3e47aa5d17082cbb56", "product": { "name": "vers:git/e844a928431fa8f1359d1f4f2cef53d9b446bf52|<04c8907ce4e3d3e26c5e1a3e47aa5d17082cbb56", "product_id": "CSAFPID-5992411" } }, { "category": "product_version_range", "name": "vers:git/e844a928431fa8f1359d1f4f2cef53d9b446bf52|<5cb81eeda909dbb2def209dd10636b51549a3f8a", "product": { "name": "vers:git/e844a928431fa8f1359d1f4f2cef53d9b446bf52|<5cb81eeda909dbb2def209dd10636b51549a3f8a", "product_id": "CSAFPID-5992413" } }, { "category": "product_version_range", "name": "vers:git/e844a928431fa8f1359d1f4f2cef53d9b446bf52|data for the\nnetlink dump callback ctnetlink_exp_ct_dump_table(), but drops the\nconntrack reference immediately after netlink_dump_start(). When the\ndump spans multiple rounds, the second recvmsg() triggers the dump\ncallback which dereferences the now-freed conntrack via nfct_help(ct),\nleading to a use-after-free on ct->ext.\n\nThe bug is that the netlink_dump_control has no .start or .done\ncallbacks to manage the conntrack reference across dump rounds. Other\ndump functions in the same file (e.g. ctnetlink_get_conntrack) properly\nuse .start/.done callbacks for this purpose.\n\nFix this by adding .start and .done callbacks that hold and release the\nconntrack reference for the duration of the dump, and move the\nnfct_help() call after the cb->args[0] early-return check in the dump\ncallback to avoid dereferencing ct->ext unnecessarily.\n\n BUG: KASAN: slab-use-after-free in ctnetlink_exp_ct_dump_table+0x4f/0x2e0\n Read of size 8 at addr ffff88810597ebf0 by task ctnetlink_poc/133\n\n CPU: 1 UID: 0 PID: 133 Comm: ctnetlink_poc Not tainted 7.0.0-rc2+ #3 PREEMPTLAZY\n Call Trace:\n \n ctnetlink_exp_ct_dump_table+0x4f/0x2e0\n netlink_dump+0x333/0x880\n netlink_recvmsg+0x3e2/0x4b0\n ? aa_sk_perm+0x184/0x450\n sock_recvmsg+0xde/0xf0\n\n Allocated by task 133:\n kmem_cache_alloc_noprof+0x134/0x440\n __nf_conntrack_alloc+0xa8/0x2b0\n ctnetlink_create_conntrack+0xa1/0x900\n ctnetlink_new_conntrack+0x3cf/0x7d0\n nfnetlink_rcv_msg+0x48e/0x510\n netlink_rcv_skb+0xc9/0x1f0\n nfnetlink_rcv+0xdb/0x220\n netlink_unicast+0x3ec/0x590\n netlink_sendmsg+0x397/0x690\n __sys_sendmsg+0xf4/0x180\n\n Freed by task 0:\n slab_free_after_rcu_debug+0xad/0x1e0\n rcu_core+0x5c3/0x9c0", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23458.json" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct()\n\nctnetlink_dump_exp_ct() stores a conntrack pointer in cb->data for the\nnetlink dump callback ctnetlink_exp_ct_dump_table(), but drops the\nconntrack reference immediately after netlink_dump_start(). When the\ndump spans multiple rounds, the second recvmsg() triggers the dump\ncallback which dereferences the now-freed conntrack via nfct_help(ct),\nleading to a use-after-free on ct->ext.\n\nThe bug is that the netlink_dump_control has no .start or .done\ncallbacks to manage the conntrack reference across dump rounds. Other\ndump functions in the same file (e.g. ctnetlink_get_conntrack) properly\nuse .start/.done callbacks for this purpose.\n\nFix this by adding .start and .done callbacks that hold and release the\nconntrack reference for the duration of the dump, and move the\nnfct_help() call after the cb->args[0] early-return check in the dump\ncallback to avoid dereferencing ct->ext unnecessarily.\n\n BUG: KASAN: slab-use-after-free in ctnetlink_exp_ct_dump_table+0x4f/0x2e0\n Read of size 8 at addr ffff88810597ebf0 by task ctnetlink_poc/133\n\n CPU: 1 UID: 0 PID: 133 Comm: ctnetlink_poc Not tainted 7.0.0-rc2+ #3 PREEMPTLAZY\n Call Trace:\n \n ctnetlink_exp_ct_dump_table+0x4f/0x2e0\n netlink_dump+0x333/0x880\n netlink_recvmsg+0x3e2/0x4b0\n ? aa_sk_perm+0x184/0x450\n sock_recvmsg+0xde/0xf0\n\n Allocated by task 133:\n kmem_cache_alloc_noprof+0x134/0x440\n __nf_conntrack_alloc+0xa8/0x2b0\n ctnetlink_create_conntrack+0xa1/0x900\n ctnetlink_new_conntrack+0x3cf/0x7d0\n nfnetlink_rcv_msg+0x48e/0x510\n netlink_rcv_skb+0xc9/0x1f0\n nfnetlink_rcv+0xdb/0x220\n netlink_unicast+0x3ec/0x590\n netlink_sendmsg+0x397/0x690\n __sys_sendmsg+0xf4/0x180\n\n Freed by task 0:\n slab_free_after_rcu_debug+0xad/0x1e0\n rcu_core+0x5c3/0x9c0", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23458" }, { "category": "other", "text": "4.1", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent CVSS (V3) score, Is related to a product by vendor Linux", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-1287432", "CSAFPID-5992408", "CSAFPID-5992409", "CSAFPID-5992410", "CSAFPID-5992411", "CSAFPID-5992412", "CSAFPID-5992413" ], "known_not_affected": [ "CSAFPID-1287433", "CSAFPID-5904647", "CSAFPID-5904654", "CSAFPID-5904671", "CSAFPID-5905005", "CSAFPID-5905006", "CSAFPID-5905027" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23458.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23458" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/bdf2724eefd4455a66863abb025bab8d3aa98c57" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/f04cc86d59906513d2d62183b882966fc0ae0390" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/f025171feef2ac65663d7986f1d5ff0c28d6b2a9" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/04c8907ce4e3d3e26c5e1a3e47aa5d17082cbb56" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/cd541f15b60e2257441398cf495d978f816d09f8" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/5cb81eeda909dbb2def209dd10636b51549a3f8a" } ], "title": "CVE-2026-23458" } ] }