Vulnary
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Critical· 9.8official fix available

CVE-2025-21796

CVE-2025-21796 is a critical vulnerability in the Linux kernel's NFS daemon where improper handling of access control lists (ACLs) can cause a use-after-free error, leading to kernel panics. The issue arises when ACLs are released without properly clearing pointers, risking system instability.

publishedFeb 27, 2025
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
47th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 29, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Systems running Linux kernel versions 6.14

02

Real-world impact

Could cause kernel panics or system crashes due to use-after-free errors in NFS service handling.

03

Why this severity

CVSS 9.8 (critical): High risk of system instability or crashes, though no public exploits are known.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade the Linux kernel to a version later than 6.14 that includes the fix for this vulnerability.

NVD description of the vulnerability and its resolution

05

Timeline

  1. Feb 27, 2025 · Feb 27, 2025
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 30, 2026 · 7d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 30, 2026 · 6d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →