VulnerabilityPublished 18 Mar 2026Updated 21 Oct 2026

CVE-2026-23259: Linux kernel · io_uring/rw: free potentially allocated iovec on cache put failure

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1, 4b9748055457ac3a0710bf210c229d01ea1b01b9, 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Mar 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 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1, 4b9748055457ac3a0710bf210c229d01ea1b01b9 or 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a9165b83c1937eeed1f0c731468216d6371d647f, < 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1	Fixed in 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1
LinuxLinux	Affected ≥ a9165b83c1937eeed1f0c731468216d6371d647f, < 4b9748055457ac3a0710bf210c229d01ea1b01b9	Fixed in 4b9748055457ac3a0710bf210c229d01ea1b01b9
LinuxLinux	Affected ≥ a9165b83c1937eeed1f0c731468216d6371d647f, < 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c	Fixed in 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c
LinuxLinux	Affected =6.10	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: free potentially allocated iovec on cache put failure If a read/write request goes through io_req_rw_cleanup() and has an allocated iovec attached and fails to put to the rw_cache, then it may end up with an unaccounted iovec pointer. Have io_rw_recycle() return whether it recycled the request or not, and use that to gauge whether to free a potential iovec or not.

References

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