PT-2026-54814 · Linux · Linux

Miguel

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Published

2026-07-01

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Updated

2026-07-01

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CVE-2026-53346

None

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In the Linux kernel, the following vulnerability has been resolved:
rust: arm64: set uwtable llvm module flag for CONFIG UNWIND TABLES
Due to a rustc bug [1] the -Cforce-unwind-tables=y flag only emits the uwtable annotation for functions, but not for the module. This means that compiler-generated functions such as 'asan.module ctor' do not receive the uwtable annotation.
When CONFIG UNWIND PATCH PAC INTO SCS is enabled, this leads to boot failures because the dwarf information emitted for the kasan constructors is wrong, which causes the SCS boot patching code to patch the constructor in an illegal manner. Specifically, the paciasp instruction is patched, but the autiasp instruction is not. This mismatch leads to a crash when the constructor is called during boot.
==================================================================
BUG: KASAN: global-out-of-bounds in do basic setup+0x4c/0x90
Read of size 8 at addr ffffffe3cc7eb488 by task swapper/0/1
Specifically the faulting instruction is the (*fn)() to invoke the constructor in do ctors() of the init/main.c file.
Once the fix lands in rustc, this flag can be made conditional on the rustc version. Note that passing the flag on a rustc with the fix present has no effect.
[ The fix [1] has landed for Rust 1.98.0 (expected release on 2026-08-20).
Thus add a version check as discussed.
  • Miguel ]
[ Adjusted link and comment. - Miguel ]
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Related Identifiers

CVE-2026-53346

Affected Products

Linux