7.8

CVE-2026-23221: bus: fsl-mc: fix use-after-free in driver_override_show()

Analyzed
AliasesUBUNTU-CVE-2026-23221DEBIAN-CVE-2026-23221
Published 18-02-2026Last modified 11-05-2026

Vulnerability summary

CVE-2026-23221 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.14%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 38 · Related 35
DLA-4499-1DSA-6162-1DSA-6163-1OPENSUSE-SU-2026:10387-1OPENSUSE-SU-2026:20416-1SUSE-SU-2026:0962-1

Timeline

  1. 18-02-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-134.134 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1060.63 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < c71dfb7833db7af652ee8f65011f14c97c47405d | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < c424e72cfa67e7e1477035058a8a659f2c0ea637 | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < b1983840287303e0dfb401b1b6cecc5ea7471e90 | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < 1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < a2ae33e1c6361e960a4d00f7cf75d880b54f9528 | ≥ 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d, < 148891e95014b5dc5878acefa57f1940c281c431 | 5.10
  • linux_kernel≥ 5.10, < 5.15.201 | ≥ 5.16, < 6.1.164 | ≥ 6.2, < 6.6.127 | ≥ 6.7, < 6.12.74 | ≥ 6.13, < 6.18.11 | ≥ 6.19, < 6.19.1
Debian1 product
  • linux< 6.1.164-1 | < 6.12.74-2 | < 6.18.12-1

3 vendors · 148 products

References

35 links
Show all 35 references