CVE-2022-50300

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Though it's\nreference counted structure, in that function it's the first and last\nallocation so this would lead to a potential use-after-free.\n\nThe error can happen eg. when chunk is stored on a missing device and\nthe degraded mount option is missing.\n\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path runs only during btrfs mount (open_ctree \u2192 btrfs_read_sys_array/btrfs_read_chunk_tree \u2192 read_one_chunk), reached via a local mount of a crafted or incomplete multi-device image, not via network packet processing.\nAC:L - An attacker can reliably trigger the UAF by supplying a filesystem whose chunk stripe references a missing device and ensuring mount without the non-default degraded option; the freshly allocated extent_map always has refcount 1 so free_extent_map unconditionally frees map before the PTR_ERR read.\nPR:N - btrfs lacks FS_USERNS_MOUNT so the attacker need not hold privileges on the victim host; crafting and delivering a malicious image (USB, download, shared disk) is sufficient, matching other mount-time filesystem UAF scores.\nUI:R - Exploitation requires a user or administrator to mount the attacker-controlled btrfs image, which is the necessary interaction that enters open_ctree and reaches read_one_chunk.\nS:U - Impact is confined to kernel memory in the host's btrfs mount path; this is standard kernel memory corruption without crossing a VM, IOMMU, or other security authority boundary.\nC:H - This is a genuine use-after-free of the kmalloc'd map_lookup and extent_map objects; per CVSS kernel guidance a UAF enables reclaim and disclosure of freed object contents for arbitrary kernel memory read.\nI:H - Use-after-free of heap objects during mount enables heap grooming and write/control-flow primitives once the freed map_lookup/extent_map slabs are reused, so integrity impact is High.\nA:H - The UAF on freed map_lookup memory can cause kernel oops/panic (including via inconsistent mount continuation if a reused object yields a misleading return code), so availability impact is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/volumes.c"], "versions": [{"version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "lessThan": "b8e7ed42bc3ca0d0e4191ee394d34962d3624c22", "status": "affected", "versionType": "git"}, {"version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "lessThan": "fce3713197ebba239e1c7e02174ed216ea1ee014", "status": "affected", "versionType": "git"}, {"version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "lessThan": "169a4cf46882974d4db6d85eb623ec898e51bbc0", "status": "affected", "versionType": "git"}, {"version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "lessThan": "1742e1c90c3da344f3bb9b1f1309b3f47482756a", "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/volumes.c"], "versions": [{"version": "4.15", "status": "affected"}, {"version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.18", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.4", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2", "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": "4.15", "versionEndExcluding": "5.15.87"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.0.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22"}, {"url": "https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014"}, {"url": "https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0"}, {"url": "https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a"}], "title": "btrfs: fix extent map use-after-free when handling missing device in read_one_chunk", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/volumes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b8e7ed42bc3ca0d0e4191ee394d34962d3624c22", "status": "affected", "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "versionType": "git"}, {"lessThan": "fce3713197ebba239e1c7e02174ed216ea1ee014", "status": "affected", "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "versionType": "git"}, {"lessThan": "169a4cf46882974d4db6d85eb623ec898e51bbc0", "status": "affected", "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "versionType": "git"}, {"lessThan": "1742e1c90c3da344f3bb9b1f1309b3f47482756a", "status": "affected", "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/volumes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.87", "versionType": "semver"}, {"lessThanOrEqual": "6.0.*", "status": "unaffected", "version": "6.0.18", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B5E4BB44-E0A4-4635-8AF7-4A3DF104A47D", "versionEndExcluding": "5.15.87", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "08D38C5F-9644-4549-BBA6-F0860F024D14", "versionEndExcluding": "6.0.18", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BC4189D9-5478-4E88-A78D-9C1DE29B217C", "versionEndExcluding": "6.1.4", "versionStartIncluding": "6.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix extent map use-after-free when handling missing device in read_one_chunk\n\nStore the error code before freeing the extent_map. Though it's\nreference counted structure, in that function it's the first and last\nallocation so this would lead to a potential use-after-free.\n\nThe error can happen eg. when chunk is stored on a missing device and\nthe degraded mount option is missing.\n\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721"}], "id": "CVE-2022-50300", "lastModified": "2026-08-04T10:18:10.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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"}, {"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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-09-15T15:15:41.483", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix extent map use-after-free when handling missing device in read_one_chunk", "id": "2395243", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395243"}, "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-2022-50300", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "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"}], "public_date": "2025-09-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50300\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50300\nhttps://lore.kernel.org/linux-cve-announce/2025091558-CVE-2022-50300-203c@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-17T10:07:29.760031+00:00", "updated": "2025-09-17T10:07:29.760086+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}