CVE-2022-50746

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This patch addresses\nthe second issue by checking the extent length validity."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only after a local EROFS mount and read/mmap/open (z_erofs_read_folio \u2192 z_erofs_do_map_blocks \u2192 z_erofs_transform_plain); erofs has FS_REQUIRES_DEV and no network-protocol entry into the decompressor.\nAC:L - A crafted image with a PLAIN pcluster whose logical extent length exceeds its physical length deterministically drives outpages > inpages and the oversized memcpy on ordinary file open/read, with no race or attacker-uncontrollable condition.\nPR:N - The attacker only needs to supply the malicious image; mounting is performed by an automated consumer (container/composefs/APEX/OTA image runtime or removable-media automounter) and requires no account or capability on the target.\nUI:N - In those deployments the mount and subsequent open/read (including IMA measurement on open as in the syzbot crash) happen as part of image pull/run or media insertion, with no separate interactive victim step required.\nS:U - The OOB/UAF copy and resulting kernel memory corruption stay within the host kernel's security authority; no VM escape, IOMMU bypass, or other cross-boundary impact occurs.\nC:H - KASAN reports a use-after-free read of 4096 bytes where memcpy copies adjacent/freed kernel memory into the file's page cache, which userspace can then read\u2014an arbitrary kernel-memory disclosure.\nI:H - The same path is a UAF/OOB memory-corruption class bug (and can take the memmove path that writes past the source page), which per kernel guidance enables heap corruption and control-flow hijacking primitives.\nA:H - The demonstrated KASAN use-after-free/out-of-bounds access can oops or panic the kernel even when not fully exploited, which is Availability High under kernel CVSS guidance."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/erofs/zmap.c"], "versions": [{"version": "02827e1796b33f1794966f5c3101f8da2dfa9c1d", "lessThan": "dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9e", "status": "affected", "versionType": "git"}, {"version": "02827e1796b33f1794966f5c3101f8da2dfa9c1d", "lessThan": "40c73b2ea9611b5388807be406f30f5e4e1162da", "status": "affected", "versionType": "git"}, {"version": "02827e1796b33f1794966f5c3101f8da2dfa9c1d", "lessThan": "c505feba4c0d76084e56ec498ce819f02a7043ae", "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/erofs/zmap.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.2", "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": "4.19", "versionEndExcluding": "6.0.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9e"}, {"url": "https://git.kernel.org/stable/c/40c73b2ea9611b5388807be406f30f5e4e1162da"}, {"url": "https://git.kernel.org/stable/c/c505feba4c0d76084e56ec498ce819f02a7043ae"}], "title": "erofs: validate the extent length for uncompressed pclusters", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-50746", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:32:20.485898Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:23.468Z"}}]}}

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{"bugzilla": {"description": "kernel: erofs: validate the extent length for uncompressed pclusters", "id": "2425197", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2425197"}, "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-2022-50746", "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": "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": "2025-12-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50746\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50746\nhttps://lore.kernel.org/linux-cve-announce/2025122450-CVE-2022-50746-7cbf@gregkh/T"], "threat_severity": "Low"}

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