VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-45974: Linux kernel · btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fd4913a53e3b54ad7e161847291439fe445d6356 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in fd4913a53e3b54ad7e161847291439fe445d6356, ecb7c2484cfc83a93658907580035a8adf1e0a92, d7cf2314dd5e8661c05d076cd627eea9a7f76616 +6

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=5.9.7 <5.10	Fixed in fd4913a53e3b54ad7e161847291439fe445d6356 ecb7c2484cfc83a93658907580035a8adf1e0a92 d7cf2314dd5e8661c05d076cd627eea9a7f76616 b5b8ade9da452086e78f5d519b90d3769e354853 b2bd557b75b760e4b9d209112bda19314bd64558 0761447f6f51e1c7997960d8e6559337deed6729 023545e272f369d487e6a986c1e321c6e04be1da 5.10 1ee1d006c9fe4d6be5527ab1c84216b80cccbe40
LinuxLinux	Affected =5.10	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found If btrfs_search_slot_for_read() returns 1, it means we did not find any key greater than or equals to the key we asked for, meaning we have reached the end of the tree and therefore the path is not valid. If this happens we need to break out of the loop and stop, instead of continuing and accessing an invalid path.

References

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