VulnerabilityPublished 23 Oct 2026

CVE-2026-98963: Linux kernel · btrfs: always return -EIOCBQUEUED after btrfs_uring_read_extent_endio

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in a449433b0e3d4a3715d0bbee078f8c603f03c9f6 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in a449433b0e3d4a3715d0bbee078f8c603f03c9f6, 80a8dbb30d2b00b9c671b02bd73f700f6d20100f, 033dda5b321f01661de518a8d5c8607ae8675b14

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 Linux kernel to a449433b0e3d4a3715d0bbee078f8c603f03c9f6, 80a8dbb30d2b00b9c671b02bd73f700f6d20100f or 033dda5b321f01661de518a8d5c8607ae8675b14.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 34310c442e175f286b4c06ab5caa4e0b267ea31c, < a449433b0e3d4a3715d0bbee078f8c603f03c9f6	Fixed in a449433b0e3d4a3715d0bbee078f8c603f03c9f6
LinuxLinux	Affected ≥ 34310c442e175f286b4c06ab5caa4e0b267ea31c, < 80a8dbb30d2b00b9c671b02bd73f700f6d20100f	Fixed in 80a8dbb30d2b00b9c671b02bd73f700f6d20100f
LinuxLinux	Affected ≥ 34310c442e175f286b4c06ab5caa4e0b267ea31c, < 033dda5b321f01661de518a8d5c8607ae8675b14	Fixed in 033dda5b321f01661de518a8d5c8607ae8675b14
LinuxLinux	Affected =6.13	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: always return -EIOCBQUEUED after btrfs_uring_read_extent_endio If all bios finish before btrfs_encoded_read_regular_fill_pages() returns, it calls btrfs_uring_read_extent_endio() and previously returned the I/O status. A negative errno then made btrfs_uring_read_extent() unlock and free while btrfs_uring_read_finished() did the same again. Return -EIOCBQUEUED so only the deferred path cleans up.

References

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