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                "role": "CISA Coordinator",
                "timestamp": "2024-06-17T19:29:32.394995Z",
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            "arch/parisc/include/asm/special_insns.h",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Fix random data corruption from exception handler\n\nThe current exception handler implementation, which assists when accessing\nuser space memory, may exhibit random data corruption if the compiler decides\nto use a different register than the specified register %r29 (defined in\nASM_EXCEPTIONTABLE_REG) for the error code. If the compiler choose another\nregister, the fault handler will nevertheless store -EFAULT into %r29 and thus\ntrash whatever this register is used for.\nLooking at the assembly I found that this happens sometimes in emulate_ldd().\n\nTo solve the issue, the easiest solution would be if it somehow is\npossible to tell the fault handler which register is used to hold the error\ncode. Using %0 or %1 in the inline assembly is not posssible as it will show\nup as e.g. %r29 (with the \"%r\" prefix), which the GNU assembler can not\nconvert to an integer.\n\nThis patch takes another, better and more flexible approach:\nWe extend the __ex_table (which is out of the execution path) by one 32-word.\nIn this word we tell the compiler to insert the assembler instruction\n\"or %r0,%r0,%reg\", where %reg references the register which the compiler\nchoosed for the error return code.\nIn case of an access failure, the fault handler finds the __ex_table entry and\ncan examine the opcode. The used register is encoded in the lowest 5 bits, and\nthe fault handler can then store -EFAULT into this register.\n\nSince we extend the __ex_table to 3 words we can\u0027t use the BUILDTIME_TABLE_SORT\nconfig option any longer."
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - Triggering requires executing an unaligned load/store instruction or issuing a syscall with an invalid user pointer on the affected PA-RISC machine, so the attacker must be able to run code locally. There is no network-reachable path into `handle_unaligned()`/`fixup_exception()`.\nAC:L - The attacker deterministically controls the trigger \u2014 mmap a region, unmap the adjacent page, and execute an unaligned access straddling the boundary (or pass a PROT_NONE pointer to any get_user()/put_user() syscall) \u2014 and can repeat it at will with no race to win. The only build-dependent factor is which register GCC allocated, a static property of the deployed binary that the attacker can inspect (parisc has no KASLR) and that was confirmed to occur in practice in `emulate_ldd()`.\nPR:L - Any unprivileged local user can execute an unaligned instruction or call a syscall with a bad pointer; no capabilities, namespaces, or special file access are needed. Unaligned emulation is enabled by default (`unaligned_enabled = 1`).\nUI:N - The attacking process triggers the fault entirely on its own by executing the unaligned instruction or making the syscall. No victim action or cooperation is required.\nS:U - The corruption is confined to kernel registers and kernel memory within the same security authority; there is no hypervisor, IOMMU, or sandbox boundary crossed.\nC:H - The fault handler clobbers whatever live kernel value the compiler placed in %r29 \u2014 a length, index, or pointer at an attacker-chosen call site \u2014 which can be steered into out-of-bounds kernel reads whose results are returned to userspace, and failed get_user()/copy paths are reported as successful so the kernel acts on data it never validly read. Per the guidance, memory corruption leverageable for information disclosure scores High.\nI:H - This is arbitrary kernel data corruption: in `emulate_ldd()` a clobbered `toreg` turns `regs-\u003egr[toreg] = val` into an out-of-bounds write past `pt_regs` on the kernel stack with attacker-influenced data, and failed `put_user()`/`cacheflush()` operations are silently reported as having succeeded. Kernel-stack out-of-bounds writes are a control-flow-hijack primitive.\nA:H - Overwriting a live kernel register with -EFAULT (0xfffffff2) turns pointers and counters into invalid values, producing immediate oops/panic when dereferenced, and the condition is trivially and repeatedly reproducible by an unprivileged user."
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        "dateUpdated": "2026-08-05T11:26:48.578Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/23027309b099ffc4efca5477009a11dccbdae592"
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          "url": "https://git.kernel.org/stable/c/fa69a8063f8b27f3c7434a0d4f464a76a62f24d2"
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          "url": "https://git.kernel.org/stable/c/ce31d79aa1f13a2345791f84935281a2c194e003"
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        {
          "url": "https://git.kernel.org/stable/c/8b1d72395635af45410b66cc4c4ab37a12c4a831"
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      ],
      "title": "parisc: Fix random data corruption from exception handler",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26706",
    "datePublished": "2024-04-03T14:55:09.529Z",
    "dateReserved": "2024-02-19T14:20:24.158Z",
    "dateUpdated": "2026-08-05T11:26:48.578Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}