CVE-2026-63800
Last modified
CVE-2026-63800 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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'. EPSS estimates a 0.50% chance of exploitation in the next 30 days.
Description
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).
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.4.91, < 5.5 |
| Linux | Linux Kernel | >= 5.10.9, < 5.10.260 |
| Linux | Linux Kernel | >= 5.11.1, < 5.15.211 |
| Linux | Linux Kernel | >= 5.16, < 6.1.177 |
| Linux | Linux Kernel | >= 6.2, < 6.6.144 |
| Linux | Linux Kernel | >= 6.7, < 6.12.95 |
| Linux | Linux Kernel | >= 6.13, < 6.18.38 |
| Linux | Linux Kernel | >= 6.19, < 7.1.3 |
| Linux | Linux Kernel | 5.11 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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