cve-2024-26706
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2024-11-05 09:14
Severity ?
Summary
parisc: Fix random data corruption from exception handler
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2024-26706",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2024-06-17T19:29:32.394995Z",
                "version": "2.0.3"
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/parisc/Kconfig",
            "arch/parisc/include/asm/assembly.h",
            "arch/parisc/include/asm/extable.h",
            "arch/parisc/include/asm/special_insns.h",
            "arch/parisc/include/asm/uaccess.h",
            "arch/parisc/kernel/cache.c",
            "arch/parisc/kernel/unaligned.c",
            "arch/parisc/mm/fault.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            "arch/parisc/include/asm/special_insns.h",
            "arch/parisc/include/asm/uaccess.h",
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            "arch/parisc/kernel/unaligned.c",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.79",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
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              "version": "6.6.18",
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              "lessThanOrEqual": "6.7.*",
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              "version": "6.7.6",
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              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
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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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        "dateUpdated": "2024-11-05T09:14:14.288Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26706",
    "datePublished": "2024-04-03T14:55:09.529Z",
    "dateReserved": "2024-02-19T14:20:24.158Z",
    "dateUpdated": "2024-11-05T09:14:14.288Z",
    "state": "PUBLISHED"
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