CVE-2022-50286

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If not, the block is delayed\nallocated, and otherwise, it isn't. However, if the inline option is\nalso used, and if the file containing the block is marked as able to\nstore data inline, there isn't a valid extent tree associated with\nthe file. The current code in ext4_clu_mapped() calls\next4_find_extent() to search the non-existent tree for a previously\nallocated cluster anyway, which typically finds nothing, as desired.\nHowever, a side effect of the search can be to cache invalid content\nfrom the non-existent tree (garbage) in the extent status tree,\nincluding bogus entries in the pending reservation tree.\n\nTo fix this, avoid searching the extent tree when allocating blocks\nfor bigalloc + inline files that are being converted from inline to\nextent mapped."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via local write(2) on an ext4 filesystem with bigalloc+inline_data during delayed-allocation inline-to-extent conversion (ext4_da_write_begin \u2192 ext4_da_get_block_prep \u2192 ext4_clu_mapped). Not network-facing kernel code.\nAC:L - An unprivileged writer can reliably trigger the bug by creating a small inline file and writing past the inline size on a bigalloc+inline filesystem; no race or unpredictable conditions are required.\nPR:L - Only requires an unprivileged local account with write access to a file on the affected filesystem; no CAP_SYS_ADMIN or init-namespace root is needed.\nUI:N - The attacker triggers the vulnerability directly through their own write syscalls; no separate victim action is required.\nS:U - Impact is confined to the local kernel/host authority (DoS, kernel memory corruption, possible privilege impact on the same system); there is no VM/IOMMU/sandbox boundary crossing.\nC:H - ext4_clu_mapped() calls ext4_find_extent() on i_data that still holds attacker-controlled inline file contents, which can poison the extent status cache and (as shown by related CVE-2023-53692 on the same path) cause use-after-free reads.\nI:H - Interpreting inline data as an extent tree yields bogus ES/pending-reservation state and UAF-class memory corruption on the same find_extent path, enabling heap corruption primitives consistent with integrity compromise and control-flow hijacking.\nA:H - The fix commit explicitly documents kernel memory leaks and potential kernel panics from invalid extent-status/pending-reservation state; UAF on this path also crashes the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "d40e09f701cf7a44e595a558b067b2b4f67fbf87", "lessThan": "f83391339d8493b9ff24167516aaa5a5e88d8f81", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "6f4200ec76a0d31200c308ec5a71c68df5417004", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "9404839e0c9db5a517ea83c0ca3388b39d105fdf", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "d440d6427a5e3a877c1c259b8d2b216ddb65e185", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "81b915181c630ee1cffa052e52874fe4e1ba91ac", "status": "affected", "versionType": "git"}, {"version": "0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6", "lessThan": "131294c35ed6f777bd4e79d42af13b5c41bf2775", "status": "affected", "versionType": "git"}, {"version": "4.19.270", "lessThan": "4.19.271", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.271", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.163", "lessThanOrEqual": "5.10.*", "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": "4.19.270", "versionEndExcluding": "4.19.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.4.229"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.10.163"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.87"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.0.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f83391339d8493b9ff24167516aaa5a5e88d8f81"}, {"url": "https://git.kernel.org/stable/c/6f4200ec76a0d31200c308ec5a71c68df5417004"}, {"url": "https://git.kernel.org/stable/c/9404839e0c9db5a517ea83c0ca3388b39d105fdf"}, {"url": "https://git.kernel.org/stable/c/d440d6427a5e3a877c1c259b8d2b216ddb65e185"}, {"url": "https://git.kernel.org/stable/c/c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193"}, {"url": "https://git.kernel.org/stable/c/81b915181c630ee1cffa052e52874fe4e1ba91ac"}, {"url": "https://git.kernel.org/stable/c/131294c35ed6f777bd4e79d42af13b5c41bf2775"}], "title": "ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline", "x_generator": {"engine": "bippy-1.2.0"}}}}

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If not, the block is delayed\nallocated, and otherwise, it isn't. However, if the inline option is\nalso used, and if the file containing the block is marked as able to\nstore data inline, there isn't a valid extent tree associated with\nthe file. The current code in ext4_clu_mapped() calls\next4_find_extent() to search the non-existent tree for a previously\nallocated cluster anyway, which typically finds nothing, as desired.\nHowever, a side effect of the search can be to cache invalid content\nfrom the non-existent tree (garbage) in the extent status tree,\nincluding bogus entries in the pending reservation tree.\n\nTo fix this, avoid searching the extent tree when allocating blocks\nfor bigalloc + inline files that are being converted from inline to\nextent mapped."}], "id": "CVE-2022-50286", "lastModified": "2026-08-04T10:18:09.990", "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"}, {"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"}]}, "published": "2025-09-15T15:15:39.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/131294c35ed6f777bd4e79d42af13b5c41bf2775"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f4200ec76a0d31200c308ec5a71c68df5417004"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81b915181c630ee1cffa052e52874fe4e1ba91ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9404839e0c9db5a517ea83c0ca3388b39d105fdf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d440d6427a5e3a877c1c259b8d2b216ddb65e185"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f83391339d8493b9ff24167516aaa5a5e88d8f81"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline", "id": "2395325", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395325"}, "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-2022-50286", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2025-09-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50286\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50286\nhttps://lore.kernel.org/linux-cve-announce/2025091508-CVE-2022-50286-b313@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-17T10:07:28.000869+00:00", "updated": "2025-09-17T10:07:28.000920+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}