{"api_version":"1","generated_at":"2026-05-13T21:18:50+00:00","cve":"CVE-2026-31556","urls":{"html":"https://cve.report/CVE-2026-31556","api":"https://cve.report/api/cve/CVE-2026-31556.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31556","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31556"},"summary":{"title":"xfs: scrub: unlock dquot before early return in quota scrub","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: scrub: unlock dquot before early return in quota scrub\n\nxchk_quota_item can return early after calling xchk_fblock_process_error.\nWhen that helper returns false, the function returned immediately without\ndropping dq->q_qlock, which can leave the dquot lock held and risk lock\nleaks or deadlocks in later quota operations.\n\nFix this by unlocking dq->q_qlock before the early return.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-24 15:16:29","updated_at":"2026-04-27 20:14:18"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b","name":"https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af","name":"https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900","name":"https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f","name":"https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31556","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31556","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7d1f0e167a067ed741dec08b7614d76893422b04 e822f535273af0e8968eab7acc0cea0b90dd25af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7d1f0e167a067ed741dec08b7614d76893422b04 3b0c3414b308e6822cda90bf99f7eac94d4cca2b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7d1f0e167a067ed741dec08b7614d76893422b04 d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7d1f0e167a067ed741dec08b7614d76893422b04 268378b6ad20569af0d1957992de1c8b16c6e900 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.80 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"31556","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31556","cve":"CVE-2026-31556","epss":"0.000180000","percentile":"0.046080000","score_date":"2026-04-27","updated_at":"2026-04-28 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the Linux kernel, the following vulnerability has been resolved:\n\nxfs: scrub: unlock dquot before early return in quota scrub\n\nxchk_quota_item can return early after calling xchk_fblock_process_error.\nWhen that helper returns false, the function returned immediately without\ndropping dq->q_qlock, which can leave the dquot lock held and risk lock\nleaks or deadlocks in later quota operations.\n\nFix this by unlocking dq->q_qlock before the early return."}],"providerMetadata":{"dateUpdated":"2026-04-24T14:35:39.880Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af"},{"url":"https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b"},{"url":"https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f"},{"url":"https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900"}],"title":"xfs: scrub: unlock dquot before early return in quota scrub","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31556","datePublished":"2026-04-24T14:35:39.880Z","dateReserved":"2026-03-09T15:48:24.115Z","dateUpdated":"2026-04-24T14:35:39.880Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-24 15:16:29","lastModifiedDate":"2026-04-27 20:14:18","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.1","versionEndExcluding":"6.12.80","matchCriteriaId":"5D6E7FC1-C351-46F7-8992-750C075964CD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.21","matchCriteriaId":"ED39847A-3B46-4729-B7CA-B2C30B9FA8FE"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.11","matchCriteriaId":"4CA2E747-A9EC-4518-9AA2-B4247FC748B7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*","matchCriteriaId":"41E47F32-BA80-4333-96FD-4D25082B0FDD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*","matchCriteriaId":"F253B622-8837-4245-BCE5-A7BF8FC76A16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*","matchCriteriaId":"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*","matchCriteriaId":"F666C8D8-6538-46D4-B318-87610DE64C34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*","matchCriteriaId":"02259FDA-961B-47BC-AE7F-93D7EC6E90C2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*","matchCriteriaId":"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*","matchCriteriaId":"1D2315C0-D46F-4F85-9754-F9E5E11374A6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*","matchCriteriaId":"512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31556","Ordinal":"1","Title":"xfs: scrub: unlock dquot before early return in quota scrub","CVE":"CVE-2026-31556","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31556","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: scrub: unlock dquot before early return in quota scrub\n\nxchk_quota_item can return early after calling xchk_fblock_process_error.\nWhen that helper returns false, the function returned immediately without\ndropping dq->q_qlock, which can leave the dquot lock held and risk lock\nleaks or deadlocks in later quota operations.\n\nFix this by unlocking dq->q_qlock before the early return.","Type":"Description","Title":"xfs: scrub: unlock dquot before early return in quota scrub"}]}}}