{"id":"CVE-2026-43109","state":"PUBLISHED","title":"x86: shadow stacks: proper error handling for mmap lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86: shadow stacks: proper error handling for mmap lock\n\n김영민 reports that shstk_pop_sigframe() doesn't check for errors from\nmmap_read_lock_killable(), which is a silly oversight, and also shows\nthat we haven't marked those functions with \"__must_check\", which would\nhave immediately caught it.\n\nSo let's fix both issues.","publishedAt":"2026-05-06T07:40:36.532Z","updatedAt":"2026-05-17T15:21:37.731Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"c79cf42321600e931933e11f94aba8b245d4cd66","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"1a30468eff661937d978495644d2e5ebfeef5ce6","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"262b6d38a81d51b135db81e1f30c13d30e38feee","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"52f657e34d7b21b47434d9d8b26fa7f6778b63a0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/shstk.c","include/linux/mmap_lock.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/shstk.c","include/linux/mmap_lock.h"]}],"references":["https://git.kernel.org/stable/c/c79cf42321600e931933e11f94aba8b245d4cd66","https://git.kernel.org/stable/c/1a30468eff661937d978495644d2e5ebfeef5ce6","https://git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4","https://git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee","https://git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43109.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43109","state":"PUBLISHED","datePublished":"2026-05-06T07:40:36.532Z","dateUpdated":"2026-05-17T15:21:37.731Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.986Z"},"containers":{"cna":{"title":"x86: shadow stacks: proper error handling for mmap lock","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86: shadow stacks: proper error handling for mmap lock\n\n김영민 reports that shstk_pop_sigframe() doesn't check for errors from\nmmap_read_lock_killable(), which is a silly oversight, and also shows\nthat we haven't marked those functions with \"__must_check\", which would\nhave immediately caught it.\n\nSo let's fix both issues."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"c79cf42321600e931933e11f94aba8b245d4cd66","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"1a30468eff661937d978495644d2e5ebfeef5ce6","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"262b6d38a81d51b135db81e1f30c13d30e38feee","versionType":"git"},{"version":"7fad2a432cd35bbf104d2d9d426e74902f22aa95","status":"affected","lessThan":"52f657e34d7b21b47434d9d8b26fa7f6778b63a0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/shstk.c","include/linux/mmap_lock.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/shstk.c","include/linux/mmap_lock.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/c79cf42321600e931933e11f94aba8b245d4cd66"},{"url":"https://git.kernel.org/stable/c/1a30468eff661937d978495644d2e5ebfeef5ce6"},{"url":"https://git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4"},{"url":"https://git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee"},{"url":"https://git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-17T15:21:37.731Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}