5.5

CVE-2026-31756: linux Improper Locking

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-31756DEBIAN-CVE-2026-31756
Published 01-05-2026Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2026-31756 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 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
0.13%
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 41 · Related 39
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop() dwc2_gadget_exit_clock_gating() internally calls call_gadget() macro, which expects hsotg->lock to be held since it does spin_unlock/spin_lock around the gadget driver callback invocation. However, dwc2_hsotg_udc_stop() calls dwc2_gadget_exit_clock_gating() without holding the lock. This leads to: - spin_unlock on a lock that is not held (undefined behavior) - The lock remaining held after dwc2_gadget_exit_clock_gating() returns, causing a deadlock when spin_lock_irqsave() is called later in the same function. Fix this by acquiring hsotg->lock before calling dwc2_gadget_exit_clock_gating() and releasing it afterwards, which satisfies the locking requirement of the call_gadget() macro.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

+0.03 pp

From 0.10% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd, < e9fcca3e87463013d595c65c2189ffaa32ad3b50 | ≥ 1ac826cebc2776f91569f2aa9c9c3da2375d2096, < 8ffe31acb3b77a30ae34d01719a269881569fb7f | ≥ 41732f9febdccb4f9b87c13cb915d717d68ccafd, < beab10429439e20708036a66fb0d97ffb79da6a1 | ≥ ba78c2b3254c4a458c01776612e8a573e12f8d26, < 4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4 | ≥ af076a41f8a28faf9ceb9dd2d88aef2c202ef39a, < 61937f686290494998236c680ce0836b8dd63a3f | ≥ af076a41f8a28faf9ceb9dd2d88aef2c202ef39a, < 51b62286fc668c6eb74dee7624ec0beec3c5a0ed | ≥ af076a41f8a28faf9ceb9dd2d88aef2c202ef39a, < 9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a | b39c203690fa1678daecc60f347e43c8b593b969 | ≥ 5.15.187, < 5.15.203 | ≥ 6.1.143, < 6.1.168 | ≥ 6.6.96, < 6.6.134 | ≥ 6.12.36, < 6.12.81 | ≥ 6.15.5, < 6.16 | 6.16
  • linux_kernel≥ 5.15.187, < 5.15.203 | ≥ 6.1.143, < 6.1.168 | ≥ 6.6.96, < 6.6.134 | ≥ 6.12.36, < 6.12.81 | ≥ 6.15.5, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 148 products

References

38 links
Show all 38 references