HOMEVULNERABILITIESCVE-2026-31556
MEDIUM

CVE-2026-31556

Published: April 24, 2026· Updated: Apr 27, 2026

5.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.6th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

xfs: scrub: unlock dquot before early return in quota scrub

xchk_quota_item can return early after calling xchk_fblock_process_error.

When that helper returns false, the function returned immediately without

dropping dq->q_qlock, which can leave the dquot lock held and risk lock

leaks or deadlocks in later quota operations.

Fix this by unlocking dq->q_qlock before the early return.

NVD Source

Technical Analysis

CVE-2026-31556 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900
PATCHhttps://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b
PATCHhttps://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f
PATCHhttps://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af

All References (4)

→
https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900Patch
→
https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2bPatch
→
https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606fPatch
→
https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25afPatch

Quick Facts

CVE IDCVE-2026-31556
CVSS Score5.5 / 10
SeverityMEDIUM
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 24, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-31556 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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