PT-2026-43930 · Linux · Linux Kernel
CVE-2026-46063
·
Published
2026-05-27
·
Updated
2026-07-08
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A deadlock can occur during the shadow stack signal frame pop process in the
sigreturn operation. The kernel attempts to verify that it is reading actual shadow stack memory by holding the mmap read lock while accessing the memory and checking the VMA flags. If the read access triggers a page fault, the fault handler attempts to recursively acquire another mmap read lock. If a writer on another CPU is waiting, this second lock request can fail, leading to a deadlock.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Improper Locking
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel