CVE-2026-43065

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If it is then remounted with nodiscard, the\n> EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is\n> neither cancelled nor flushed.\n\n[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/\n[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev\n\nThe concern was valid, but it had nothing to do with the patch[1].\nOne of the problems with Sashiko in its current (early) form is that\nit will detect pre-existing issues and report it as a problem with the\npatch that it is reviewing.\n\nIn practice, it would be hard to hit deliberately (unless you are a\nmalicious syzkaller fuzzer), since it would involve mounting the file\nsystem with -o discard, and then deleting a large number of files,\nremounting the file system with -o nodiscard, and then immediately\nunmounting the file system before the queued discard work has a change\nto drain on its own.\n\nFix it because it's a real bug, and to avoid Sashiko from raising this\nconcern when analyzing future patches to mballoc.c."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "55cdd0af2bc5ffc92a2deb745627755aecd5db33", "lessThan": "e96c2354b170aaa53300c8e8fd59e41b133160f7", "status": "affected", "versionType": "git"}, {"version": "55cdd0af2bc5ffc92a2deb745627755aecd5db33", "lessThan": "c360e9d0def4f4ae03254a67c683103908555b75", "status": "affected", "versionType": "git"}, {"version": "55cdd0af2bc5ffc92a2deb745627755aecd5db33", "lessThan": "1c82f863f090ab899085bdfade073313384b514b", "status": "affected", "versionType": "git"}, {"version": "55cdd0af2bc5ffc92a2deb745627755aecd5db33", "lessThan": "9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8", "status": "affected", "versionType": "git"}, {"version": "55cdd0af2bc5ffc92a2deb745627755aecd5db33", "lessThan": 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If it is then remounted with nodiscard, the\n> EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is\n> neither cancelled nor flushed.\n\n[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/\n[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev\n\nThe concern was valid, but it had nothing to do with the patch[1].\nOne of the problems with Sashiko in its current (early) form is that\nit will detect pre-existing issues and report it as a problem with the\npatch that it is reviewing.\n\nIn practice, it would be hard to hit deliberately (unless you are a\nmalicious syzkaller fuzzer), since it would involve mounting the file\nsystem with -o discard, and then deleting a large number of files,\nremounting the file system with -o nodiscard, and then immediately\nunmounting the file system before the queued discard work has a change\nto drain on its own.\n\nFix it because it's a real bug, and to avoid Sashiko from raising this\nconcern when analyzing future patches to mballoc.c."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.131", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.80", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.21", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.11", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:17:02.221Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43065", "state": "PUBLISHED", "dateUpdated": "2026-11-06T15:32:29.604Z", "dateReserved": "2026-05-01T14:12:55.981Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-05T15:23:25.326Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If it is then remounted with nodiscard, the\n> EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is\n> neither cancelled nor flushed.\n\n[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/\n[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev\n\nThe concern was valid, but it had nothing to do with the patch[1].\nOne of the problems with Sashiko in its current (early) form is that\nit will detect pre-existing issues and report it as a problem with the\npatch that it is reviewing.\n\nIn practice, it would be hard to hit deliberately (unless you are a\nmalicious syzkaller fuzzer), since it would involve mounting the file\nsystem with -o discard, and then deleting a large number of files,\nremounting the file system with -o nodiscard, and then immediately\nunmounting the file system before the queued discard work has a change\nto drain on its own.\n\nFix it because it's a real bug, and to avoid Sashiko from raising this\nconcern when analyzing future patches to mballoc.c."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\next4: siempre vaciar el trabajo de descarte en cola en ext4_mb_release()\n\nMientras revisaba un parche reciente de ext4[1], Sashiko plante\u00f3 la siguiente preocupaci\u00f3n[2]:\n\n\u2019Si el sistema de archivos se monta inicialmente con la opci\u00f3n discard, eliminar archivos poblar\u00e1 sbi -> s_discard_list y pondr\u00e1 en cola s_discard_work. Si luego se vuelve a montar con nodiscard, la bandera EXT4_MOUNT_DISCARD se borra, pero el s_discard_work pendiente no se cancela ni se vac\u00eda.\u2019\n\n[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/\n[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev\n\nLa preocupaci\u00f3n era v\u00e1lida, pero no ten\u00eda nada que ver con el parche[1]. Uno de los problemas con Sashiko en su forma actual (temprana) es que detectar\u00e1 problemas preexistentes y los reportar\u00e1 como un problema con el parche que est\u00e1 revisando.\n\nEn la pr\u00e1ctica, ser\u00eda dif\u00edcil de activar deliberadamente (a menos que seas un fuzzer syzkaller malicioso), ya que implicar\u00eda montar el sistema de archivos con -o discard, y luego eliminar un gran n\u00famero de archivos, volver a montar el sistema de archivos con -o nodiscard, y luego desmontar inmediatamente el sistema de archivos antes de que el trabajo de descarte en cola tenga la oportunidad de vaciarse por s\u00ed solo.\n\nSe corrige porque es un error real, y para evitar que Sashiko plantee esta preocupaci\u00f3n al analizar futuros parches para mballoc.c."}], "id": "CVE-2026-43065", "lastModified": "2026-11-11T21:10:00.200", "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-2026-43065", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:27:46.955616Z", "version": "2.0.3"}}]}, "published": "2026-05-05T16:16:15.683", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c82f863f090ab899085bdfade073313384b514b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ee29d20aab228adfb02ca93f87fb53c56c2f3af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c360e9d0def4f4ae03254a67c683103908555b75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e96c2354b170aaa53300c8e8fd59e41b133160f7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ext4: always drain queued discard work in ext4_mb_release()", "id": "2466801", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466801"}, "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"}, "cwe": "CWE-772", "details": ["A flaw was found in the ext4 filesystem within the Linux kernel. When an ext4 filesystem is initially mounted with the 'discard' option and then remounted with 'nodiscard', pending discard operations may not be properly cancelled or flushed. This can lead to unhandled resource operations if the filesystem is unmounted before these operations complete, potentially causing system instability or unexpected behavior under specific, difficult-to-trigger conditions."], "name": "CVE-2026-43065", "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": "Out of support scope", "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": "2026-05-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43065\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43065\nhttps://lore.kernel.org/linux-cve-announce/2026050532-CVE-2026-43065-4766@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,e96c2354b170aaa53300c8e8fd59e41b133160f7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,c360e9d0def4f4ae03254a67c683103908555b75)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,1c82f863f090ab899085bdfade073313384b514b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[55cdd0af2bc5ffc92a2deb745627755aecd5db33,9ee29d20aab228adfb02ca93f87fb53c56c2f3af)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-05T17:30:05.993480+00:00", "updated": "2026-05-29T20:30:07.363841+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}