CVE-2026-63820

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63820", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.014Z", "datePublished": "2026-07-19T12:02:18.211Z", "dateUpdated": "2026-08-17T04:51:27.881Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:27.881Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix missing read bio submission on large folio error\n\nf2fs_read_data_large_folio() can keep a read bio across multiple\nreadahead folios. If a later folio hits an error before any of its\nblocks are added to the bio, folio_in_bio is false and the current error\npath returns immediately after ending that folio.\n\nThis can leave the bio accumulated for earlier folios unsubmitted. Those\nfolios then never receive read completion, and readers can wait\nindefinitely on the locked folios.\n\nRoute errors through the common out path so any pending bio is submitted\nbefore returning. Stop consuming more readahead folios once an error is\nseen, and only wait on and clear the current folio when it was actually\nadded to the bio."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/data.c"], "versions": [{"version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd", "lessThan": "48c92559e7b66fdc3cbc74f6e152e66ec0150a0a", "status": "affected", "versionType": "git"}, {"version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd", "lessThan": "74c8d2ec95c59a5651ecd975c466998af1961fd4", "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/f2fs/data.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "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": "7.0", "versionEndExcluding": "7.1.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/48c92559e7b66fdc3cbc74f6e152e66ec0150a0a"}, {"url": "https://git.kernel.org/stable/c/74c8d2ec95c59a5651ecd975c466998af1961fd4"}], "title": "f2fs: fix missing read bio submission on large folio error", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/f2fs/data.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "48c92559e7b66fdc3cbc74f6e152e66ec0150a0a", "status": "affected", "version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd", "versionType": "git"}, {"lessThan": "74c8d2ec95c59a5651ecd975c466998af1961fd4", "status": "affected", "version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/f2fs/data.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "63CFDFF9-82B8-4490-8239-D88ABC42DF23", "versionEndExcluding": "7.1.3", "versionStartIncluding": "7.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix missing read bio submission on large folio error\n\nf2fs_read_data_large_folio() can keep a read bio across multiple\nreadahead folios. If a later folio hits an error before any of its\nblocks are added to the bio, folio_in_bio is false and the current error\npath returns immediately after ending that folio.\n\nThis can leave the bio accumulated for earlier folios unsubmitted. Those\nfolios then never receive read completion, and readers can wait\nindefinitely on the locked folios.\n\nRoute errors through the common out path so any pending bio is submitted\nbefore returning. Stop consuming more readahead folios once an error is\nseen, and only wait on and clear the current folio when it was actually\nadded to the bio."}], "id": "CVE-2026-63820", "lastModified": "2026-11-10T17:25:06.713", "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"}]}, "published": "2026-07-19T12:16:55.103", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48c92559e7b66fdc3cbc74f6e152e66ec0150a0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74c8d2ec95c59a5651ecd975c466998af1961fd4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-404"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: fix missing read bio submission on large folio error", "id": "2502201", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502201"}, "csaw": false, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix missing read bio submission on large folio error\nf2fs_read_data_large_folio() can keep a read bio across multiple\nreadahead folios. If a later folio hits an error before any of its\nblocks are added to the bio, folio_in_bio is false and the current error\npath returns immediately after ending that folio.\nThis can leave the bio accumulated for earlier folios unsubmitted. Those\nfolios then never receive read completion, and readers can wait\nindefinitely on the locked folios.\nRoute errors through the common out path so any pending bio is submitted\nbefore returning. Stop consuming more readahead folios once an error is\nseen, and only wait on and clear the current folio when it was actually\nadded to the bio.", "A flaw was found in the Linux kernel's f2fs (Flash-Friendly File System) component. This vulnerability occurs when the `f2fs_read_data_large_folio()` function fails to submit a read block I/O (bio) request if an error is encountered on a subsequent memory page (folio). This can cause earlier folios to remain locked indefinitely, leading to a denial of service (DoS) where affected readers are unable to proceed."], "name": "CVE-2026-63820", "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": "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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63820\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63820\nhttps://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63820-1fc3@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd,48c92559e7b66fdc3cbc74f6e152e66ec0150a0a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd,74c8d2ec95c59a5651ecd975c466998af1961fd4)"}}], "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": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.3,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "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": "2026-07-21T13:30:07.002783+00:00", "updated": "2026-07-30T22:15:13.613652+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}