VulnerabilityPublished 9 Jun 2026Updated 6 Nov 2026

CVE-2026-46315: Linux kernel · io_uring/waitid: clear waitid info before copying it to userspace

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in b737c6612c60c23b40a9f31749b99e6f61943847 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 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 b737c6612c60c23b40a9f31749b99e6f61943847, 954518e5a4a5efc5033253f6e36fc7b9f98363a3, 93d93f5f8da791e98159795c6ef683f45bd95d13 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jun 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 Linux kernel to b737c6612c60c23b40a9f31749b99e6f61943847, 954518e5a4a5efc5033253f6e36fc7b9f98363a3, 93d93f5f8da791e98159795c6ef683f45bd95d13 or 4d2a0de611ab60d02fc768ae0cd5918b16bd5474.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f31ecf671ddc498f20219453395794ff2383e06b, < b737c6612c60c23b40a9f31749b99e6f61943847	Fixed in b737c6612c60c23b40a9f31749b99e6f61943847
LinuxLinux	Affected ≥ f31ecf671ddc498f20219453395794ff2383e06b, < 954518e5a4a5efc5033253f6e36fc7b9f98363a3	Fixed in 954518e5a4a5efc5033253f6e36fc7b9f98363a3
LinuxLinux	Affected ≥ f31ecf671ddc498f20219453395794ff2383e06b, < 93d93f5f8da791e98159795c6ef683f45bd95d13	Fixed in 93d93f5f8da791e98159795c6ef683f45bd95d13
LinuxLinux	Affected ≥ f31ecf671ddc498f20219453395794ff2383e06b, < 4d2a0de611ab60d02fc768ae0cd5918b16bd5474	Fixed in 4d2a0de611ab60d02fc768ae0cd5918b16bd5474
LinuxLinux	Affected =6.7	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: clear waitid info before copying it to userspace IORING_OP_WAITID stores its result fields in struct io_waitid::info and later copies them to userspace siginfo. The prep path initializes the request arguments, but it does not initialize info itself. If the wait operation completes without reporting a child event, the common wait code can return without writing wo_info. In that case io_waitid_finish() still copies iw->info to userspace, exposing stale bytes from the reused io_kiocb command storage. Clear the result storage during prep so the io_uring path matches the regular waitid syscall, which uses a zero-initialized struct waitid_info.

References

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