{"id":"CVE-2026-63800","title":"In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo).…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo).…","severity":"critical","published":"2026-07-19","updated":"2026-07-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63800","references":[{"url":"https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-07-20T00:35:12.318Z","epss":0.00644,"epssPercentile":0.50687,"vendor":"Linux","product":"Linux","affected":["Linux >= 06f58dbc49a23c99e5c0f246879ed16667f7bf8f < 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 9c0fb5c09ae5bd68dc0038692af8127029cb0385","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 2883ddd7542b4437a2ab4908fe2773f690e20889","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 200e7637f4d6a1342987045eea72641524f909dc","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 9645aaf689aff57427ece3b9fa47d5b5399417f4","Linux >= 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 13e198a90ca4050f4bee8a3f23680389a6563ccc","Linux aa2399f55eff4ec78330bb6fe55f9df53e5cae0c","Linux >= 5.10.9 < 5.10.260","Linux >= 5.4.91 < 5.5","Linux 5.11"],"cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:30:40.400910Z"},"cvssSource":"cna","slug":"CVE-2026-63800","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":223134,"id":"CVE-2026-63800","ts":1792172308519,"field":"cvss","old":null,"new":"9.8"},{"seq":223133,"id":"CVE-2026-63800","ts":1792172308519,"field":"severity","old":"none","new":"critical"}]}