{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-50778", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:21.547Z", "datePublished": "2025-12-24T13:06:07.182Z", "dateUpdated": "2025-12-24T13:06:07.182Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-24T13:06:07.182Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfortify: Fix __compiletime_strlen() under UBSAN_BOUNDS_LOCAL\n\nWith CONFIG_FORTIFY=y and CONFIG_UBSAN_LOCAL_BOUNDS=y enabled, we observe\na runtime panic while running Android's Compatibility Test Suite's (CTS)\nandroid.hardware.input.cts.tests. This is stemming from a strlen()\ncall in hidinput_allocate().\n\n__compiletime_strlen() is implemented in terms of __builtin_object_size(),\nthen does an array access to check for NUL-termination. A quirk of\n__builtin_object_size() is that for strings whose values are runtime\ndependent, __builtin_object_size(str, 1 or 0) returns the maximum size\nof possible values when those sizes are determinable at compile time.\nExample:\n\n static const char *v = \"FOO BAR\";\n static const char *y = \"FOO BA\";\n unsigned long x (int z) {\n // Returns 8, which is:\n // max(__builtin_object_size(v, 1), __builtin_object_size(y, 1))\n return __builtin_object_size(z ? v : y, 1);\n }\n\nSo when FORTIFY_SOURCE is enabled, the current implementation of\n__compiletime_strlen() will try to access beyond the end of y at runtime\nusing the size of v. Mixed with UBSAN_LOCAL_BOUNDS we get a fault.\n\nhidinput_allocate() has a local C string whose value is control flow\ndependent on a switch statement, so __builtin_object_size(str, 1)\nevaluates to the maximum string length, making all other cases fault on\nthe last character check. hidinput_allocate() could be cleaned up to\navoid runtime calls to strlen() since the local variable can only have\nliteral values, so there's no benefit to trying to fortify the strlen\ncall site there.\n\nPerform a __builtin_constant_p() check against index 0 earlier in the\nmacro to filter out the control-flow-dependant case. Add a KUnit test\nfor checking the expected behavioral characteristics of FORTIFY_SOURCE\ninternals."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/fortify-string.h"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ed42391164e6839a48aaf4c53eefda516835e799", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "5d59ad2bfb35fccfe2ad5e8bb8801f6224d3f7d4", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d07c0acb4f41cc42a0d97530946965b3e4fa68c1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/fortify-string.h"], "versions": [{"version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.19.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.0.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ed42391164e6839a48aaf4c53eefda516835e799"}, {"url": "https://git.kernel.org/stable/c/5d59ad2bfb35fccfe2ad5e8bb8801f6224d3f7d4"}, {"url": "https://git.kernel.org/stable/c/d07c0acb4f41cc42a0d97530946965b3e4fa68c1"}], "title": "fortify: Fix __compiletime_strlen() under UBSAN_BOUNDS_LOCAL", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfortify: Fix __compiletime_strlen() under UBSAN_BOUNDS_LOCAL\n\nWith CONFIG_FORTIFY=y and CONFIG_UBSAN_LOCAL_BOUNDS=y enabled, we observe\na runtime panic while running Android's Compatibility Test Suite's (CTS)\nandroid.hardware.input.cts.tests. This is stemming from a strlen()\ncall in hidinput_allocate().\n\n__compiletime_strlen() is implemented in terms of __builtin_object_size(),\nthen does an array access to check for NUL-termination. A quirk of\n__builtin_object_size() is that for strings whose values are runtime\ndependent, __builtin_object_size(str, 1 or 0) returns the maximum size\nof possible values when those sizes are determinable at compile time.\nExample:\n\n static const char *v = \"FOO BAR\";\n static const char *y = \"FOO BA\";\n unsigned long x (int z) {\n // Returns 8, which is:\n // max(__builtin_object_size(v, 1), __builtin_object_size(y, 1))\n return __builtin_object_size(z ? v : y, 1);\n }\n\nSo when FORTIFY_SOURCE is enabled, the current implementation of\n__compiletime_strlen() will try to access beyond the end of y at runtime\nusing the size of v. Mixed with UBSAN_LOCAL_BOUNDS we get a fault.\n\nhidinput_allocate() has a local C string whose value is control flow\ndependent on a switch statement, so __builtin_object_size(str, 1)\nevaluates to the maximum string length, making all other cases fault on\nthe last character check. hidinput_allocate() could be cleaned up to\navoid runtime calls to strlen() since the local variable can only have\nliteral values, so there's no benefit to trying to fortify the strlen\ncall site there.\n\nPerform a __builtin_constant_p() check against index 0 earlier in the\nmacro to filter out the control-flow-dependant case. Add a KUnit test\nfor checking the expected behavioral characteristics of FORTIFY_SOURCE\ninternals."}], "id": "CVE-2022-50778", "lastModified": "2025-12-24T13:16:04.640", "metrics": {}, "published": "2025-12-24T13:16:04.640", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d59ad2bfb35fccfe2ad5e8bb8801f6224d3f7d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d07c0acb4f41cc42a0d97530946965b3e4fa68c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed42391164e6839a48aaf4c53eefda516835e799"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}