Answer in brief
CVE-2026-63800 records a Critical severity (CVSS 9.8) vulnerability in pNFS: Fix use-after-free in pnfs_update_layout(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06f58dbc49a23c99e5c0f246879ed16667f7bf8f <4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <9c0fb5c09ae5bd68dc0038692af8127029cb0385 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <2883ddd7542b4437a2ab4908fe2773f690e20889 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <200e7637f4d6a1342987045eea72641524f909dc || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <9645aaf689aff57427ece3b9fa47d5b5399417f4 || >=2c8d5fc37fe2384a9bdb6965443ab9224d46f704 <13e198a90ca4050f4bee8a3f23680389a6563ccc || aa2399f55eff4ec78330bb6fe55f9df53e5cae0c || >=5.10.9 <5.10.260 || >=5.4.91 <5.5 | 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98, 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2, 9c0fb5c09ae5bd68dc0038692af8127029cb0385, 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1, 2883ddd7542b4437a2ab4908fe2773f690e20889, 200e7637f4d6a1342987045eea72641524f909dc, 9645aaf689aff57427ece3b9fa47d5b5399417f4, 13e198a90ca4050f4bee8a3f23680389a6563ccc, 5.10.260, 5.5 |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).
Quoted source text, attributed separately from HOL analysis.