CVE-2026-46182
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.
Affected versions
Linux kernel versions
6.18
and later are affected. Fixed in
6.18.30,
7.0.7,
7.1-rc3
and their respective stable series.
References
The following references provide additional information about CVE-2026-46182 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5
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PatchKernel patch commithttps://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be
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PatchKernel patch commithttps://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659
Frequently asked questions
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What is CVE-2026-46182?
CVE-2026-46182 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.30, 7.0.7 and 7.1-rc3. CVE-2026-46182 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46182?
Yes — CVE-2026-46182 has been patched. Fixed versions include 6.18.30, 7.0.7 and 7.1-rc3. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46182 actively exploited?
No — CVE-2026-46182 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.