CVE-2026-23002

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23002", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.938Z", "datePublished": "2026-01-25T14:36:16.713Z", "dateUpdated": "2026-11-05T21:23:14.922Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:58:06.332Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/buildid: use __kernel_read() for sleepable context\n\nPrevent a \"BUG: unable to handle kernel NULL pointer dereference in\nfilemap_read_folio\".\n\nFor the sleepable context, convert freader to use __kernel_read() instead\nof direct page cache access via read_cache_folio(). This simplifies the\nfaultable code path by using the standard kernel file reading interface\nwhich handles all the complexity of reading file data.\n\nAt the moment we are not changing the code for non-sleepable context which\nuses filemap_get_folio() and only succeeds if the target folios are\nalready in memory and up-to-date. The reason is to keep the patch simple\nand easier to backport to stable kernels.\n\nSyzbot repro does not crash the kernel anymore and the selftests run\nsuccessfully.\n\nIn the follow up we will make __kernel_read() with IOCB_NOWAIT work for\nnon-sleepable contexts. In addition, I would like to replace the\nsecretmem check with a more generic approach and will add fstest for the\nbuildid code."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/buildid.c"], "versions": [{"version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "b11dfb7708f212b96c7973a474014c071aa02e05", "status": "affected", "versionType": "git"}, {"version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "568aeb3476c770a3863c755dd2a199c212434286", "status": "affected", "versionType": "git"}, {"version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "777a8560fd29738350c5094d4166fe5499452409", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/buildid.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.67", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.7", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b11dfb7708f212b96c7973a474014c071aa02e05"}, {"url": "https://git.kernel.org/stable/c/568aeb3476c770a3863c755dd2a199c212434286"}, {"url": "https://git.kernel.org/stable/c/777a8560fd29738350c5094d4166fe5499452409"}], "title": "lib/buildid: use __kernel_read() for sleepable context", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23002", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T21:18:20.306589Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T21:23:14.922Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23002", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T21:18:20.306589Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T21:18:21.347Z"}}], "cna": {"title": "lib/buildid: use __kernel_read() for sleepable context", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "b11dfb7708f212b96c7973a474014c071aa02e05", "versionType": "git"}, {"status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "568aeb3476c770a3863c755dd2a199c212434286", "versionType": "git"}, {"status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "lessThan": "777a8560fd29738350c5094d4166fe5499452409", "versionType": "git"}], "programFiles": ["lib/buildid.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"status": "unaffected", "version": "0", "lessThan": "6.12", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.67", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.7", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["lib/buildid.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/b11dfb7708f212b96c7973a474014c071aa02e05"}, {"url": "https://git.kernel.org/stable/c/568aeb3476c770a3863c755dd2a199c212434286"}, {"url": "https://git.kernel.org/stable/c/777a8560fd29738350c5094d4166fe5499452409"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/buildid: use __kernel_read() for sleepable context\n\nPrevent a \"BUG: unable to handle kernel NULL pointer dereference in\nfilemap_read_folio\".\n\nFor the sleepable context, convert freader to use __kernel_read() instead\nof direct page cache access via read_cache_folio(). This simplifies the\nfaultable code path by using the standard kernel file reading interface\nwhich handles all the complexity of reading file data.\n\nAt the moment we are not changing the code for non-sleepable context which\nuses filemap_get_folio() and only succeeds if the target folios are\nalready in memory and up-to-date. The reason is to keep the patch simple\nand easier to backport to stable kernels.\n\nSyzbot repro does not crash the kernel anymore and the selftests run\nsuccessfully.\n\nIn the follow up we will make __kernel_read() with IOCB_NOWAIT work for\nnon-sleepable contexts. In addition, I would like to replace the\nsecretmem check with a more generic approach and will add fstest for the\nbuildid code."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.67", "versionStartIncluding": "6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.7", "versionStartIncluding": "6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:58:06.332Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23002", "state": "PUBLISHED", "dateUpdated": "2026-11-05T21:23:14.922Z", "dateReserved": "2026-01-13T15:37:45.938Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-01-25T14:36:16.713Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["lib/buildid.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b11dfb7708f212b96c7973a474014c071aa02e05", "status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "versionType": "git"}, {"lessThan": "568aeb3476c770a3863c755dd2a199c212434286", "status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "versionType": "git"}, {"lessThan": "777a8560fd29738350c5094d4166fe5499452409", "status": "affected", "version": "ad41251c290dfe3c01472c94d2439a59de23fe97", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["lib/buildid.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.67", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26C9CFAB-AE12-4395-997A-22AC98AF8490", "versionEndExcluding": "6.12.67", "versionStartIncluding": "6.12.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "99FF3E05-0E7A-44E9-8E47-BF6F1F8EC436", "versionEndExcluding": "6.18.7", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:-:*:*:*:*:*:*", "matchCriteriaId": "0E698080-7669-4132-8817-4C674EEBCE54", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*", "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*", "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/buildid: use __kernel_read() for sleepable context\n\nPrevent a \"BUG: unable to handle kernel NULL pointer dereference in\nfilemap_read_folio\".\n\nFor the sleepable context, convert freader to use __kernel_read() instead\nof direct page cache access via read_cache_folio(). This simplifies the\nfaultable code path by using the standard kernel file reading interface\nwhich handles all the complexity of reading file data.\n\nAt the moment we are not changing the code for non-sleepable context which\nuses filemap_get_folio() and only succeeds if the target folios are\nalready in memory and up-to-date. The reason is to keep the patch simple\nand easier to backport to stable kernels.\n\nSyzbot repro does not crash the kernel anymore and the selftests run\nsuccessfully.\n\nIn the follow up we will make __kernel_read() with IOCB_NOWAIT work for\nnon-sleepable contexts. In addition, I would like to replace the\nsecretmem check with a more generic approach and will add fstest for the\nbuildid code."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlib/buildid: usar __kernel_read() para contexto 'sleepable'\n\nPrevenir un 'BUG: unable to handle kernel NULL pointer dereference in filemap_read_folio'.\n\nPara el contexto 'sleepable', convertir freader para usar __kernel_read() en lugar del acceso directo a la cach\u00e9 de p\u00e1ginas a trav\u00e9s de read_cache_folio(). Esto simplifica la ruta de c\u00f3digo 'faultable' al usar la interfaz est\u00e1ndar de lectura de archivos del kernel que maneja toda la complejidad de la lectura de datos de archivos.\n\nPor el momento no estamos cambiando el c\u00f3digo para el contexto 'non-sleepable' que usa filemap_get_folio() y solo tiene \u00e9xito si los folios objetivo ya est\u00e1n en memoria y actualizados. La raz\u00f3n es mantener el parche simple y m\u00e1s f\u00e1cil de 'backportear' a kernels estables.\n\nLa reproducci\u00f3n de Syzbot ya no bloquea el kernel y las pruebas autom\u00e1ticas se ejecutan con \u00e9xito.\n\nEn el seguimiento haremos que __kernel_read() con IOCB_NOWAIT funcione para contextos 'non-sleepable'. Adem\u00e1s, me gustar\u00eda reemplazar la verificaci\u00f3n de secretmem con un enfoque m\u00e1s gen\u00e9rico y a\u00f1adir\u00e9 fstest para el c\u00f3digo buildid."}], "id": "CVE-2026-23002", "lastModified": "2026-11-05T22:17:59.347", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23002", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:18:20.306589Z", "version": "2.0.3"}}]}, "published": "2026-01-25T15:15:55.070", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/568aeb3476c770a3863c755dd2a199c212434286"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/777a8560fd29738350c5094d4166fe5499452409"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b11dfb7708f212b96c7973a474014c071aa02e05"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: lib/buildid: use __kernel_read() for sleepable context", "id": "2432666", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432666"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23002", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23002\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23002\nhttps://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23002-ffa4@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-18T15:06:51.761533+00:00", "value": {"mitigation_remediation": ["Upgrade the kernel to a release that includes the__kernel_read() patch for the buildid module (e.g., the latest 6.12 or 6.19 releases).", "Reboot the system to load the updated kernel.", "Run a test that triggers a buildid read operation (for example, accessing an ELF file) and confirm that no kernel BUG or crash occurs."], "summary": {"action": "Patch Update", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Linux kernel builds that include the buildid module, notably version 6.12 and the 6.19 series, including pre\u2011release candidates 6.19\u2011rc1 through rc8. Any system running these kernels with the buildid functionality active is potentially impacted.", "description_and_impact": "This kernel bug occurs in the buildid module where direct page cache access via read_cache_folio() can dereference a NULL pointer in sleepable contexts. The resulting kernel crash, reported as \"BUG: unable to handle kernel NULL pointer dereference,\" disrupts system availability. The flaw is identified as a NULL pointer dereference (CWE-476).", "risk_and_exploitability": "The CVSS score of 5.5 indicates a moderate risk, while an EPSS score of less than 1\u202f% suggests a very low probability of exploitation under current threat data. The vulnerability is not listed in the CISA KEV catalog. Attackers would need to trigger the faulty read path, typically via local privilege or code that accesses buildid data, to cause a crash."}}}}, "created": "2026-04-18T15:15:03.689505+00:00", "title": "Null Pointer Dereference in Linux Kernel Buildid Module Causing Crash", "updated": "2026-04-18T15:15:03.689515+00:00", "vendors": []}