9.8

CVE-2026-89536: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-89536DEBIAN-CVE-2026-89536
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-89536 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.64%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 10
MGASA-2026-0506OPENSUSE-SU-2026:11880-1OPENSUSE-SU-2026:22091-1SUSE-SU-2026:24179-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: wait for in-flight client TLS handshake callback xs_tls_handshake_sync() gives xs_tls_handshake_done() a reference to the lower transport before submitting the handshake request. On timeout or signal, the synchronous waiter drops that reference after calling tls_handshake_cancel(). handshake_req_cancel() returns false when handshake_complete() has already marked the request complete. In that case the completion callback can still be running, so dropping the callback-owned reference in the waiter can free the lower transport before xs_tls_handshake_done() stores xprt_err or drops its own reference. If cancellation loses to completion, wait until xs_tls_handshake_done() signals handshake_done and let the callback release its reference. This mirrors the server-side handshake lifetime handling and keeps the timeout or signal return value unchanged.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

+0.01 pp

From 0.63% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu142 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 75eb6af7acdf566c68d61e98e67ee2f235201c02, < fb43997407bc17ee39bac81ab708101312e255f5 | ≥ 75eb6af7acdf566c68d61e98e67ee2f235201c02, < 15431820f448e09f8029b670d5c82aa5917d4625 | ≥ 75eb6af7acdf566c68d61e98e67ee2f235201c02, < 1de391e8b94e31b45c19c16dbf315e294810c7de | ≥ 75eb6af7acdf566c68d61e98e67ee2f235201c02, < 7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b | ≥ 75eb6af7acdf566c68d61e98e67ee2f235201c02, < a89dd597458848b463d284b15e42a8078beeb046 | 6.5

3 vendors · 145 products

References

9 links