Critical· 9.8official fix available
CVE-2026-89546
A race condition in the Linux kernel's SUNRPC backchannel handling can cause requests to be enqueued after the callback service is being torn down, leading to memory leaks and potential use‑after‑free. The fix adds a function to close the backchannel before destroying the callback service and ensures proper cleanup of pending requests.
publishedSep 11, 2026
last modifiedSep 13, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
9th 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 Oct 13, 2026
An official fix is available, so this entry is kept for 30 days and then removed automatically.
01
Who is affected
02
Real-world impact
03
Why this severity
04
What to do about it
official fix available
recommended steps
- 011. Update the Linux kernel to a version that includes the fix (e.g., the latest stable release).
- 022. Reboot the system to apply the updated kernel.
NVD-referenced vendor advisory
05
Timeline
- Sep 11, 2026 · 2d agoPublishedDisclosed and added to the National Vulnerability Database.
- Sep 13, 2026 · 7h agoOfficial fix availableA 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
(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 →