{"id":"CVE-2026-93167","revision":null,"records":[{"revision":"ca204941b1c24df792905c2bbb598ee1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93167","aliases":[],"title":"csky: Fix a4/a5 restoration in syscall trace path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncsky: Fix a4/a5 restoration in syscall trace path\n\nThe syscall trace path reloads syscall arguments from pt_regs before\ncalling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall\narguments are prepared as stack arguments before invoking syscallid.\n\nThe current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since\nthose offsets are relative to the original pt_regs base, loading them\nafter changing sp fetches the wrong slots. As a result, traced syscalls\nthat use the 5th or 6th argument may receive corrupted arguments.\n\nThis is visible with mmap2(), which takes six arguments. A small\nPTRACE_SYSCALL reproducer opens a file and maps one page with:\n\n mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0)\n\nBefore the fix, the traced child fails the mmap and exits with 12.\nAfter the fix, the mapping succeeds and the child exits with 0.\n\nFix the trace path by loading a4/a5 from pt_regs before changing sp.\n\nTested on: ck860f, linux-4.19.15, C-SKY abiv2","state":0,"publishedAt":"2026-09-17T16:11:59.234+00:00","modifiedAt":"2026-10-19T09:06:39.063+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/csky/kernel/entry.S\"\n ],\n \"versions\": [\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"e9ae8e86eed68bea5d2670eadf61938a43bd2263\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"64e3ec7a71d3b715e2567f19f64207f04999bb0c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"863fa63fd1491f201ac819f805a8db98d2a32c3d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"31c81b376e5f058c7f2c94f69719cf7caec2fc3f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"a776afa89424570bfa637ebf812ca281a5732904\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"343aa5275484d627c921a42e8e115cae366be5de\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\n \"lessThan\": \"abb81e5ce7d995baa41556b8125fa59e28ba3be8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"108681048cf728a8570e036c34ebd7daa43133b4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3a5837c692918c229baf63fe7950965d27c48ac2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.4.47\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.6.19\",\n \"lessThan\": \"5.7\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/csky/kernel/entry.S\"\n ],\n \"versions\": [\n {\n \"version\": \"5.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263","https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c","https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d","https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e","https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f","https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904","https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de","https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93167","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93167","identifiers":["CVE-2026-93167"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-3c8e547b28ad4f0fa34b0d9a3442b37e","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T02:21:06.332251+00:00","lastSuccessAt":"2026-11-09T02:21:06.328+00:00","error":null,"lastVerifiedAt":"2026-11-09T02:21:06.328+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13634,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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