Bug 2524458 (CVE-2026-80571)

Summary: CVE-2026-80571 kernel: powerpc/pseries: papr-phy-attest - validate cmd.length, plug mem leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `powerpc/pseries: papr-phy-attest` component. This vulnerability arises from insufficient validation of a command length parameter, which can lead to a buffer overflow. Such an overflow could be exploited by a local attacker to potentially execute arbitrary code or cause a system crash (denial of service). Additionally, improper memory deallocation in error handling paths could result in a memory leak, further contributing to system instability.
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Description OSIDB Bzimport 2026-08-26 14:57:09 UTC 
In the Linux kernel, the following vulnerability has been resolved:

powerpc/pseries: papr-phy-attest - validate cmd.length, plug mem leak

In papr_phy_attest_create_handle(), the params->cmd.length is not
validated before use, which can result in a buffer overlow.  Check it and
return -EINVAL if it is either 0 or exceeds sizeof(params->cmd).

Also, params is freed on the success path but not error. Free it on
errors after memory allocation.  And free it on negative fd.
Comment 1 gkamathe 2026-08-27 09:00:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082612-CVE-2026-80571-b189@gregkh/T