5.5

CVE-2026-53231: linux Improper Locking

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-53231DEBIAN-CVE-2026-53231
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-53231 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.08% chance of exploitation in the next 30 days, higher than 0.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.08%
0%100%
Low · -0.03 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 11
USN-8726-1USN-8726-2USN-8726-3USN-8726-4USN-8727-1USN-8728-1

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.

Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: don't try to setup PHY-driven SFP cages when using genphy We don't have support for PHY-driver SFP cages with the genphy code. On top of that, it was found by sashiko that running sfp_bus_add_upstream() for genphy deadlocks, as for genphy the PHY probing runs under RTNL, which isn't the case for non-genphy drivers. This problem was reproduced, and does lead to a deadlock on RTNL. Before the blamed commit, the phy_sfp_probe() call was made by individual PHY drivers, so there was no way to get to the SFP probing path when using genphy. Let's therefore only run phy_sfp_probe when not using genphy.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.08%

Chance of exploitation in the next 30 days

Percentile

0%

Versus all other CVEs

30-day change

-0.03 pp

From 0.11% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.08%

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

Affected systems

Ubuntu110 products
  • linux< 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ bad869b5e41a08424ff130fd6bb41b854be70095, < ef8d739eee6f85303cbecebc01eb72f063de74e0 | ≥ bad869b5e41a08424ff130fd6bb41b854be70095, < 5a0082ec20a05ef2378410323a5089a8f1786f4a | 7.0
  • linux_kernel≥ 7.0, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
  • linux< 7.0.13-1

3 vendors · 113 products

References

17 links
Show all 17 references