{ "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-2026-23467", "tracking": { "current_release_date": "2026-04-03T16:49:31.916349Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-23467", "initial_release_date": "2026-04-03T15:39:56.628407Z", "revision_history": [ { "date": "2026-04-03T15:39:56.628407Z", "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": "2026-04-03T15:40:08.363523Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-04-03T16:49:30.568173Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (3)." } ], "status": "interim", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/88c1f9a4d36de61f87cc52aac670020b13d1ccaa|<0b35d11fbbcfd1079c8489282a341944228835e3", "product": { "name": "vers:git/88c1f9a4d36de61f87cc52aac670020b13d1ccaa|<0b35d11fbbcfd1079c8489282a341944228835e3", "product_id": "CSAFPID-5992287" } }, { "category": "product_version_range", "name": "vers:git/88c1f9a4d36de61f87cc52aac670020b13d1ccaa|<631317825d44283abfe7a8374f13a76ce2032bb8", "product": { "name": "vers:git/88c1f9a4d36de61f87cc52aac670020b13d1ccaa|<631317825d44283abfe7a8374f13a76ce2032bb8", "product_id": "CSAFPID-5992288" } }, { "category": "product_version_range", "name": "vers:git/88c1f9a4d36de61f87cc52aac670020b13d1ccaa| {skl,bxt,icl}_display_core_init() ->\ngen9_set_dc_state() -> intel_dmc_update_dc6_allowed_count(), as\nintel_power_domains_init_hw() is called *before* intel_dmc_init().\n\nHowever, gen9_set_dc_state() calls intel_dmc_update_dc6_allowed_count()\nconditionally, depending on the current and target DC states. At probe,\nthe target is disabled, but if DC6 is enabled, the function is called,\nand an oops follows. Apparently it's quite unlikely that DC6 is enabled\nat probe, as we haven't seen this failure mode before.\n\nIt is also strange to have DC6 enabled at boot, since that would require\nthe DMC firmware (loaded by BIOS); the BIOS loading the DMC firmware and\nthe driver stopping / reprogramming the firmware is a poorly specified\nsequence and as such unlikely an intentional BIOS behaviour. It's more\nlikely that BIOS is leaving an unintentionally enabled DC6 HW state\nbehind (without actually loading the required DMC firmware for this).\n\nThe tracking of the DC6 allowed counter only works if starting /\nstopping the counter depends on the _SW_ DC6 state vs. the current _HW_\nDC6 state (since stopping the counter requires the DC5 counter captured\nwhen the counter was started). Thus, using the HW DC6 state is incorrect\nand it also leads to the above oops. Fix both issues by using the SW DC6\nstate for the tracking.\n\nThis is v2 of the fix originally sent by Jani, updated based on the\nfirst Link: discussion below.\n\n(cherry picked from commit 2344b93af8eb5da5d496b4e0529d35f0f559eaf0)", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23467.json" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/dmc: Fix an unlikely NULL pointer deference at probe\n\nintel_dmc_update_dc6_allowed_count() oopses when DMC hasn't been\ninitialized, and dmc is thus NULL.\n\nThat would be the case when the call path is\nintel_power_domains_init_hw() -> {skl,bxt,icl}_display_core_init() ->\ngen9_set_dc_state() -> intel_dmc_update_dc6_allowed_count(), as\nintel_power_domains_init_hw() is called *before* intel_dmc_init().\n\nHowever, gen9_set_dc_state() calls intel_dmc_update_dc6_allowed_count()\nconditionally, depending on the current and target DC states. At probe,\nthe target is disabled, but if DC6 is enabled, the function is called,\nand an oops follows. Apparently it's quite unlikely that DC6 is enabled\nat probe, as we haven't seen this failure mode before.\n\nIt is also strange to have DC6 enabled at boot, since that would require\nthe DMC firmware (loaded by BIOS); the BIOS loading the DMC firmware and\nthe driver stopping / reprogramming the firmware is a poorly specified\nsequence and as such unlikely an intentional BIOS behaviour. It's more\nlikely that BIOS is leaving an unintentionally enabled DC6 HW state\nbehind (without actually loading the required DMC firmware for this).\n\nThe tracking of the DC6 allowed counter only works if starting /\nstopping the counter depends on the _SW_ DC6 state vs. the current _HW_\nDC6 state (since stopping the counter requires the DC5 counter captured\nwhen the counter was started). Thus, using the HW DC6 state is incorrect\nand it also leads to the above oops. Fix both issues by using the SW DC6\nstate for the tracking.\n\nThis is v2 of the fix originally sent by Jani, updated based on the\nfirst Link: discussion below.\n\n(cherry picked from commit 2344b93af8eb5da5d496b4e0529d35f0f559eaf0)", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23467" }, { "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-3063686", "CSAFPID-5992287", "CSAFPID-5992288", "CSAFPID-5992289" ], "known_not_affected": [ "CSAFPID-3063687", "CSAFPID-5905005", "CSAFPID-5905006", "CSAFPID-5905027" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23467.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23467" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/0b35d11fbbcfd1079c8489282a341944228835e3" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/631317825d44283abfe7a8374f13a76ce2032bb8" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/ac57eb3b7d2ad649025b5a0fa207315f755ac4f6" } ], "title": "CVE-2026-23467" } ] }