x86/kexec: Push kjump return address even for non-kjump kexec

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Summary

CVECVE-2026-53282
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 20:17:20 UTC
Updated2026-06-26 20:17:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/kexec: Push kjump return address even for non-kjump kexec The version of purgatory code shipped by kexec-tools attempts to look above the top of its stack to find a return address for a kjump, even in a non-kjump kexec. After the commit in Fixes: the word above the stack might not be there, leading to a fault (which is at least now caught by my exception-handling code in kexec). That commit fixed things for the actual kjump path, but no longer "gratuitously" pushes the unused return address to the stack in the non-kjump path. Put that *back* in the non-kjump path, to prevent purgatory from crashing when trying to access it.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2cacf7f23a024ab1fdc603ca6a4f4c8b2de9f64e b0bd7a850e1f082560959707dbf57b0402071646 git Not specified
CNA Linux Linux affected 2cacf7f23a024ab1fdc603ca6a4f4c8b2de9f64e 7dba9631faa2ee0785e8c2bf0e3d90a05f26dd8c git Not specified
CNA Linux Linux affected 2cacf7f23a024ab1fdc603ca6a4f4c8b2de9f64e 786a45757dcdf8f2beb9d4a6db605db16c18b2b4 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7dba9631faa2ee0785e8c2bf0e3d90a05f26dd8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/786a45757dcdf8f2beb9d4a6db605db16c18b2b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0bd7a850e1f082560959707dbf57b0402071646 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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