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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-63800] Fix use-after-free in pnfs_update_layout

This high-severity Red Hat Linux advisory covers CVE-2026-63800 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-63800 Source published Source updated

VulniPulse record published Record updated

CVE-2026-63800
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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).

A flaw was found in the Linux kernel's parallel Network File System (pNFS) component. An issue in the `pnfs_update_layout()` function causes a use-after-free vulnerability due to incorrect ordering of memory management operations.

This flaw can be triggered when the system attempts to update a pNFS layout, potentially leading to system instability, crashes, or a denial of service. In some scenarios, this type of memory corruption could be exploited by a local attacker to achieve arbitrary code execution.

Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-825.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6.

Affected products named by the advisory: Red Hat package: kernel-rt.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.50.1.el10_2
  • kernel-rt-0:4.18.0-553.159.1.rt7.500.el8_10
  • kernel-0:4.18.0-553.159.1.el8_10
  • kernel-0:5.14.0-687.44.1.el9_8
  • RHSA-2026:61887
  • RHSA-2026:63013
  • RHSA-2026:63014
  • RHSA-2026:63129

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.50.1.el10_2, kernel-rt-0:4.18.0-553.159.1.rt7.500.el8_10, kernel-0:4.18.0-553.159.1.el8_10, kernel-0:5.14.0-687.44.1.el9_8, RHSA-2026:61887, RHSA-2026:63013. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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