CVE-2026-53346 (GCVE-0-2026-53346)
Vulnerability from cvelistv5
Published
2026-07-01 13:32
Modified
2026-07-01 13:32
Severity ?
Summary
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 ]
References
Impacted products
Vendor Product Version
Linux Linux Version: d077242d68a31075ef5f5da041bf8f6fc19aa231
Version: d077242d68a31075ef5f5da041bf8f6fc19aa231
Version: d077242d68a31075ef5f5da041bf8f6fc19aa231
Version: d077242d68a31075ef5f5da041bf8f6fc19aa231
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: arm64: set uwtable llvm module flag for CONFIG_UNWIND_TABLES\n\nDue to a rustc bug [1] the -Cforce-unwind-tables=y flag only emits the\nuwtable annotation for functions, but not for the module. This means\nthat compiler-generated functions such as \u0027asan.module_ctor\u0027 do not\nreceive the uwtable annotation.\n\nWhen CONFIG_UNWIND_PATCH_PAC_INTO_SCS is enabled, this leads to boot\nfailures because the dwarf information emitted for the kasan\nconstructors is wrong, which causes the SCS boot patching code to\npatch the constructor in an illegal manner. Specifically, the paciasp\ninstruction is patched, but the autiasp instruction is not. This\nmismatch leads to a crash when the constructor is called during boot.\n\n\t==================================================================\n\tBUG: KASAN: global-out-of-bounds in do_basic_setup+0x4c/0x90\n\tRead of size 8 at addr ffffffe3cc7eb488 by task swapper/0/1\n\nSpecifically the faulting instruction is the (*fn)() to invoke the\nconstructor in do_ctors() of the init/main.c file.\n\nOnce the fix lands in rustc, this flag can be made conditional on the\nrustc version. Note that passing the flag on a rustc with the fix\npresent has no effect.\n\n[ The fix [1] has landed for Rust 1.98.0 (expected release on\n  2026-08-20).\n\n  Thus add a version check as discussed.\n\n    - Miguel ]\n\n[ Adjusted link and comment. - Miguel ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T13:32:25.668Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/ac35b5580ace12e5d0a0b5e61e36d2c4e1ffa29c"
        }
      ],
      "title": "rust: arm64: set uwtable llvm module flag for CONFIG_UNWIND_TABLES",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53346",
    "datePublished": "2026-07-01T13:32:25.668Z",
    "dateReserved": "2026-06-09T07:44:35.399Z",
    "dateUpdated": "2026-07-01T13:32:25.668Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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