VulnerabilityPublished 28 May 2026Updated 6 Nov 2026

CVE-2026-46182: Linux kernel · pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f88f8e4485b437e0a2f96a7ff1f88aa22d925659 : 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 f88f8e4485b437e0a2f96a7ff1f88aa22d925659, cefeed44296261173a806bef988b26bc565da4be, 0479b6e9f999cc1cbad7d9f09f574fc387e605d5

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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 Linux kernel to f88f8e4485b437e0a2f96a7ff1f88aa22d925659, cefeed44296261173a806bef988b26bc565da4be or 0479b6e9f999cc1cbad7d9f09f574fc387e605d5.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86, < f88f8e4485b437e0a2f96a7ff1f88aa22d925659	Fixed in f88f8e4485b437e0a2f96a7ff1f88aa22d925659
LinuxLinux	Affected ≥ cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86, < cefeed44296261173a806bef988b26bc565da4be	Fixed in cefeed44296261173a806bef988b26bc565da4be
LinuxLinux	Affected ≥ cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86, < 0479b6e9f999cc1cbad7d9f09f574fc387e605d5	Fixed in 0479b6e9f999cc1cbad7d9f09f574fc387e605d5
LinuxLinux	Affected =6.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace The hdr variable is allocated on the stack and only hdr.version and hdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr contains reserved padding bytes (reserved[3] and reserved2[40]), these could leak the uninitialized bytes to userspace after copy_to_user(). This patch fixes that by initializing the whole struct to 0.

References

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