{"id":"CVE-2026-89543","state":"PUBLISHED","title":"sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir\n\nNormal client creation goes through rpc_setup_pipedir(), which records\nclnt->pipefs_sb, but the mount-event path in __rpc_clnt_handle_event()\ncalls rpc_setup_pipedir_sb() directly and never refreshes that field.\nThe umount path also removes the directory without clearing\nclnt->pipefs_sb.\n\nAfter a late pipefs mount or any remount, rpc_clnt_remove_pipedir()\ncompares the current superblock against a stale pipefs_sb pointer and\nskips cleanup, leaving pipefs dentries whose inode private data still\npoints at a freed rpc_clnt, leading to a potential use-after-free during\nsubsequent rpc_info_open() or rpc_show_info() calls.\n\nFix this by properly updating clnt->pipefs_sb upon mount events and\nclearing it during unmount or failure paths.","publishedAt":"2026-09-11T19:44:19.679Z","updatedAt":"2026-10-30T12:32:06.731Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7749fd2dbef72a52b5c9ffdbf877691950ed4680","status":"affected","lessThan":"1a713814e0580f946196bca5e340b37991c6e8bf","versionType":"git"},{"version":"cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a","status":"affected","lessThan":"f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"59527bbfb1eabdb28e95e7c725886cc2c2899cb3","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"e769fcde3cc73e847b1eb3acd40c04a291cb0c0c","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"cdf7a233cb94774b0e7df42d9157077983f5022c","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"932a8cf6abb2b2f8677b79153a823108d8861fe2","versionType":"git"},{"version":"17866066b8ac1cc38fb449670bc15dc9fee4b40a","status":"affected","versionType":"git"},{"version":"7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5","status":"affected","versionType":"git"},{"version":"dedf2a0eb9448ae73b270743e6ea9b108189df46","status":"affected","versionType":"git"},{"version":"194454afa6aa9d6ed74f0c57127bc8beb27c20df","status":"affected","versionType":"git"},{"version":"1cdb52ffd6600a37bd355d8dce58ecd03e55e618","status":"affected","versionType":"git"},{"version":"6.1.64","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"6.6.3","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"4.19.318","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.280","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.202","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.140","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.5.13","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/clnt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/clnt.c"]}],"references":["https://git.kernel.org/stable/c/1a713814e0580f946196bca5e340b37991c6e8bf","https://git.kernel.org/stable/c/f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd","https://git.kernel.org/stable/c/59527bbfb1eabdb28e95e7c725886cc2c2899cb3","https://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c","https://git.kernel.org/stable/c/cdf7a233cb94774b0e7df42d9157077983f5022c","https://git.kernel.org/stable/c/932a8cf6abb2b2f8677b79153a823108d8861fe2"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89543.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89543","state":"PUBLISHED","datePublished":"2026-09-11T19:44:19.679Z","dateUpdated":"2026-10-30T12:32:06.731Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.722Z"},"containers":{"cna":{"title":"sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir\n\nNormal client creation goes through rpc_setup_pipedir(), which records\nclnt->pipefs_sb, but the mount-event path in __rpc_clnt_handle_event()\ncalls rpc_setup_pipedir_sb() directly and never refreshes that field.\nThe umount path also removes the directory without clearing\nclnt->pipefs_sb.\n\nAfter a late pipefs mount or any remount, rpc_clnt_remove_pipedir()\ncompares the current superblock against a stale pipefs_sb pointer and\nskips cleanup, leaving pipefs dentries whose inode private data still\npoints at a freed rpc_clnt, leading to a potential use-after-free during\nsubsequent rpc_info_open() or rpc_show_info() calls.\n\nFix this by properly updating clnt->pipefs_sb upon mount events and\nclearing it during unmount or failure paths."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7749fd2dbef72a52b5c9ffdbf877691950ed4680","status":"affected","lessThan":"1a713814e0580f946196bca5e340b37991c6e8bf","versionType":"git"},{"version":"cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a","status":"affected","lessThan":"f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"59527bbfb1eabdb28e95e7c725886cc2c2899cb3","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"e769fcde3cc73e847b1eb3acd40c04a291cb0c0c","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"cdf7a233cb94774b0e7df42d9157077983f5022c","versionType":"git"},{"version":"bfca5fb4e97c46503ddfc582335917b0cc228264","status":"affected","lessThan":"932a8cf6abb2b2f8677b79153a823108d8861fe2","versionType":"git"},{"version":"17866066b8ac1cc38fb449670bc15dc9fee4b40a","status":"affected","versionType":"git"},{"version":"7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5","status":"affected","versionType":"git"},{"version":"dedf2a0eb9448ae73b270743e6ea9b108189df46","status":"affected","versionType":"git"},{"version":"194454afa6aa9d6ed74f0c57127bc8beb27c20df","status":"affected","versionType":"git"},{"version":"1cdb52ffd6600a37bd355d8dce58ecd03e55e618","status":"affected","versionType":"git"},{"version":"6.1.64","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"6.6.3","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"4.19.318","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.280","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.202","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.140","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.5.13","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/clnt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/clnt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1a713814e0580f946196bca5e340b37991c6e8bf"},{"url":"https://git.kernel.org/stable/c/f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd"},{"url":"https://git.kernel.org/stable/c/59527bbfb1eabdb28e95e7c725886cc2c2899cb3"},{"url":"https://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c"},{"url":"https://git.kernel.org/stable/c/cdf7a233cb94774b0e7df42d9157077983f5022c"},{"url":"https://git.kernel.org/stable/c/932a8cf6abb2b2f8677b79153a823108d8861fe2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:32:06.731Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.64","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.3","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.318"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.280"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*: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