VulnSocial

CVE-2026-63800Patch(linux / linux_kernel)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch linux linux_kernel systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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).

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0.5/ 10 priority

Sources & remediation

Patch / fix
Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • linux_kernel

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
linux
Products
linux_kernel

1 version affected across 1 product

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-25: 1Patch / Workaround · 2026-07-25: 1Technical Details · 2026-07-25: 107-25
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • SecAlerts@SecAlertsCo
    Patch

    🐧 Linux Kernel CVE-2026-63800: use-after-free in pnfs_update_layout() via NFS_LAYOUT_RETURN branch. CVSS 9.8, no auth, no user interaction needed. Full C/I/A impact. Patch your kernel now. #cybersecurity #ciso #cto #vulnerabilities #msp #mssp https://secalerts.co/vulnerability/CVE-2026-63800?utm_campaign=x https://t.co/cDSCQUbSZl

    Post summary

    The tweet announces a critical Linux Kernel CVE‑2026‑63800 use‑after‑free vulnerability, provides technical details, and urges immediate kernel patching.

    00000183
    869 followersView on X
CPE platform detail6 entries

6 of 6 entries

PartVendorProductVersionTarget SWTarget HW
OSlinuxlinux_kernel---
OSlinuxlinux_kernel5.11--
OSlinuxlinux_kernel5.11--
OSlinuxlinux_kernel5.11--
OSlinuxlinux_kernel5.11--
OSlinuxlinux_kernel5.11--

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