7.7

CVE-2026-90167: linux

CVSS: 7.7v4.0HighReceived
AliasesUBUNTU-CVE-2026-90167DEBIAN-CVE-2026-90167
Published 17-09-2026Last modified 21-10-2026
Open JSON

Vulnerability summary

CVE-2026-90167 is a high (CVSS 7.7) vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.7/10
010
High · v4.0 (OSV · Ubuntu), selected by version preference
EPSS score
0.21%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11893-1

Timeline

  1. 17-09-2026
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: serialize oplock close with pending break ownership close may abort an in-flight oplock break while another breaker already holds an opinfo reference. Releasing pending_break wakes that waiter, but without serializing the close transition with bit acquisition it can become a new break owner through the test_and_set_bit() fast path. It can then overwrite OPLOCK_CLOSING with OPLOCK_ACK_WAIT and continue a break for a dying opinfo. Make OPLOCK_CLOSING terminal once the opinfo is removed from the inode list. Serialize that transition, pending_break acquisition, and OPLOCK_ACK_WAIT setup with an opinfo state lock. A breaker which loses the race releases its ownership and returns -ENOENT. Explicitly wake pending_break waiters during close so they can observe the terminal state. Also prevent ACK and timeout paths from replacing OPLOCK_CLOSING with OPLOCK_STATE_NONE.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.02 pp

From 0.19% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.21%

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

Ubuntu157 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)
Debian1 product
  • linuxAll versions (No fix recorded) | < 7.2.6-1
Linux1 product
  • linux≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 7148a6c06ddf1c263a1cf422bee541f24d3d3926 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 7d6e682b7633120c2f93400b8c6f335d9d8e5318 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < dc1e34f78dfab755fab9ad820ac5f82348fe1792 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5f97bac88bfb333f426f01c118b8235e75af8d96 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < b0148dc5625dbfd50596ac63c7487c12e8a8ab03 | 5.15

3 vendors · 159 products

References

9 links