CVE-2026-53346 is a vulnerability in Linux Kernel
Published on July 1, 2026
rust: arm64: set uwtable llvm module flag for CONFIG_UNWIND_TABLES
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 ]
Products Associated with CVE-2026-53346
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Affected Versions
Linux:- Version d077242d68a31075ef5f5da041bf8f6fc19aa231 and below bde772ee239720af216fb0b14753971059e132dc is affected.
- Version d077242d68a31075ef5f5da041bf8f6fc19aa231 and below d0f25a1755f2c15b1746379c8d9d7dfde85f58f5 is affected.
- Version d077242d68a31075ef5f5da041bf8f6fc19aa231 and below 7de13410f59e59b21d3c268a6e22d40f5d9d8a54 is affected.
- Version d077242d68a31075ef5f5da041bf8f6fc19aa231 and below ac35b5580ace12e5d0a0b5e61e36d2c4e1ffa29c is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.