CVE-2026-68442

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no remote protocol data is involved.\nAC:L - Although the flag is only mis-propagated while an fsync has an extent map flagged for logging, the attacker controls both sides of the race - one thread loops fsync() while another loops writes/punch-hole on the same file - and the resulting bogus map is then freed deterministically by any later drop of that range.\nPR:L - Any unprivileged local user who can create and write a file on a btrfs filesystem (btrfs is the default root fs on several major distros, and /tmp or a home directory suffices) can drive the splitting and logging paths; no capabilities are required.\nUI:N - The attacker performs all the required operations itself (write, punch hole, fsync on its own file); no victim action or administrator involvement is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or other boundary.\nC:H - The freed extent_map stays linked in the inode's modified_extents list, so later traversal in btrfs_log_changed_extents() dereferences freed slab memory; an attacker who reallocates the object controls what is read back, giving a use-after-free read primitive usable to disclose kernel memory.\nI:H - The dangling list node is written through by list_del_init()/list_add_tail() during fsync, writing attacker-influenced pointers into and from a freed heap object; such list-corruption use-after-frees are the classic basis for arbitrary write and privilege escalation.\nA:H - The bug already trips WARN_ON(!list_empty(&em->list)) and then operates on freed memory, causing list corruption and an oops or panic (immediately fatal with panic_on_warn or list debugging enabled), which an unprivileged user can trigger repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/extent_map.c"], "versions": [{"version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "2a9246a424f45f33a1b8367052611ebe874868ad", "status": "affected", "versionType": "git"}, {"version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "9304713b70e7e1450e3a76e758836fe5391bfa95", "status": "affected", "versionType": "git"}, {"version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "0e465c63f103a5ce6849614d6bda048d70eebec8", "status": "affected", "versionType": "git"}, {"version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "5eff4d5b17fa1950e80bfd1ba43dc0699e61a644", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/extent_map.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.8", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad"}, {"url": "https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95"}, {"url": "https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8"}, {"url": "https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"}], "title": "btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68442", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:48:58.466646Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T21:09:10.486Z"}}]}}

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no remote protocol data is involved.\nAC:L - Although the flag is only mis-propagated while an fsync has an extent map flagged for logging, the attacker controls both sides of the race - one thread loops fsync() while another loops writes/punch-hole on the same file - and the resulting bogus map is then freed deterministically by any later drop of that range.\nPR:L - Any unprivileged local user who can create and write a file on a btrfs filesystem (btrfs is the default root fs on several major distros, and /tmp or a home directory suffices) can drive the splitting and logging paths; no capabilities are required.\nUI:N - The attacker performs all the required operations itself (write, punch hole, fsync on its own file); no victim action or administrator involvement is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or other boundary.\nC:H - The freed extent_map stays linked in the inode's modified_extents list, so later traversal in btrfs_log_changed_extents() dereferences freed slab memory; an attacker who reallocates the object controls what is read back, giving a use-after-free read primitive usable to disclose kernel memory.\nI:H - The dangling list node is written through by list_del_init()/list_add_tail() during fsync, writing attacker-influenced pointers into and from a freed heap object; such list-corruption use-after-frees are the classic basis for arbitrary write and privilege escalation.\nA:H - The bug already trips WARN_ON(!list_empty(&em->list)) and then operates on freed memory, causing list corruption and an oops or panic (immediately fatal with panic_on_warn or list debugging enabled), which an unprivileged user can trigger repeatedly."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "2a9246a424f45f33a1b8367052611ebe874868ad", "versionType": "git"}, {"status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "9304713b70e7e1450e3a76e758836fe5391bfa95", "versionType": "git"}, {"status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "0e465c63f103a5ce6849614d6bda048d70eebec8", "versionType": "git"}, {"status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "lessThan": "5eff4d5b17fa1950e80bfd1ba43dc0699e61a644", "versionType": "git"}], "programFiles": ["fs/btrfs/extent_map.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.101", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/btrfs/extent_map.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad"}, {"url": "https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95"}, {"url": "https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8"}, {"url": "https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps\n\nWhen btrfs_drop_extent_map_range() splits an extent map, the new split\nmaps inherit the original map's flags through a local 'flags' variable.\nCommit f86f7a75e2fb (\"btrfs: use the flags of an extent map to identify\nthe compression type\") changed the EXTENT_FLAG_LOGGING clearing to\noperate on em->flags instead of that local 'flags' copy, so a split of\nan extent map that is currently being logged wrongly inherits\nEXTENT_FLAG_LOGGING.\n\nThe flag is then never cleared on the split, and when it is freed while\nstill on the inode's modified_extents list (for example by the extent\nmap shrinker) it trips the WARN_ON(!list_empty(&em->list)) in\nbtrfs_free_extent_map() and leads to a use-after-free.\n\nClear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the\nsplits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the\nbehaviour prior to f86f7a75e2fb."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:05:39.676Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68442", "state": "PUBLISHED", "dateUpdated": "2026-10-19T21:09:10.486Z", "dateReserved": "2026-07-30T09:28:09.394Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-12T00:07:31.981Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/extent_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2a9246a424f45f33a1b8367052611ebe874868ad", "status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "versionType": "git"}, {"lessThan": "9304713b70e7e1450e3a76e758836fe5391bfa95", "status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "versionType": "git"}, {"lessThan": "0e465c63f103a5ce6849614d6bda048d70eebec8", "status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "versionType": "git"}, {"lessThan": "5eff4d5b17fa1950e80bfd1ba43dc0699e61a644", "status": "affected", "version": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/extent_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps\n\nWhen btrfs_drop_extent_map_range() splits an extent map, the new split\nmaps inherit the original map's flags through a local 'flags' variable.\nCommit f86f7a75e2fb (\"btrfs: use the flags of an extent map to identify\nthe compression type\") changed the EXTENT_FLAG_LOGGING clearing to\noperate on em->flags instead of that local 'flags' copy, so a split of\nan extent map that is currently being logged wrongly inherits\nEXTENT_FLAG_LOGGING.\n\nThe flag is then never cleared on the split, and when it is freed while\nstill on the inode's modified_extents list (for example by the extent\nmap shrinker) it trips the WARN_ON(!list_empty(&em->list)) in\nbtrfs_free_extent_map() and leads to a use-after-free.\n\nClear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the\nsplits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the\nbehaviour prior to f86f7a75e2fb."}], "id": "CVE-2026-68442", "lastModified": "2026-10-19T22:17:19.330", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68442", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:48:58.466646Z", "version": "2.0.3"}}]}, "published": "2026-08-12T00:17:44.477", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps", "id": "2514449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514449"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps\nWhen btrfs_drop_extent_map_range() splits an extent map, the new split\nmaps inherit the original map's flags through a local 'flags' variable.\nCommit f86f7a75e2fb (\"btrfs: use the flags of an extent map to identify\nthe compression type\") changed the EXTENT_FLAG_LOGGING clearing to\noperate on em->flags instead of that local 'flags' copy, so a split of\nan extent map that is currently being logged wrongly inherits\nEXTENT_FLAG_LOGGING.\nThe flag is then never cleared on the split, and when it is freed while\nstill on the inode's modified_extents list (for example by the extent\nmap shrinker) it trips the WARN_ON(!list_empty(&em->list)) in\nbtrfs_free_extent_map() and leads to a use-after-free.\nClear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the\nsplits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the\nbehaviour prior to f86f7a75e2fb.", "A flaw was found in the btrfs filesystem component of the Linux kernel. When an extent map is split, a flag (EXTENT_FLAG_LOGGING) is incorrectly propagated to the new split maps. This issue occurs because the flag clearing operation was applied to the wrong variable during the splitting process. Consequently, if a split extent map with this flag is freed while still in use, it can lead to a use-after-free vulnerability, potentially causing system instability or a denial of service."], "name": "CVE-2026-68442", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68442\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68442\nhttps://lore.kernel.org/linux-cve-announce/2026081256-CVE-2026-68442-db7a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9,2a9246a424f45f33a1b8367052611ebe874868ad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9,9304713b70e7e1450e3a76e758836fe5391bfa95)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9,0e465c63f103a5ce6849614d6bda048d70eebec8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9,5eff4d5b17fa1950e80bfd1ba43dc0699e61a644)"}}], "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": "6.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "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": "2026-08-12T16:00:04.248362+00:00", "updated": "2026-10-20T10:30:06.310911+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}