CVE-2026-89543

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89543", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.722Z", "datePublished": "2026-09-11T19:44:19.679Z", "dateUpdated": "2026-10-30T12:32:06.731Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:06.731Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/clnt.c"], "versions": [{"version": "7749fd2dbef72a52b5c9ffdbf877691950ed4680", "lessThan": "1a713814e0580f946196bca5e340b37991c6e8bf", "status": "affected", "versionType": "git"}, {"version": "cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a", "lessThan": "f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd", "status": "affected", "versionType": "git"}, {"version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "lessThan": "59527bbfb1eabdb28e95e7c725886cc2c2899cb3", "status": "affected", "versionType": "git"}, {"version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "lessThan": "e769fcde3cc73e847b1eb3acd40c04a291cb0c0c", "status": "affected", "versionType": "git"}, {"version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "lessThan": "cdf7a233cb94774b0e7df42d9157077983f5022c", "status": "affected", "versionType": "git"}, {"version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "lessThan": "932a8cf6abb2b2f8677b79153a823108d8861fe2", "status": "affected", "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", "lessThan": "6.1.191", "status": "affected", "versionType": "semver"}, {"version": "6.6.3", "lessThan": "6.6.160", "status": "affected", "versionType": "semver"}, {"version": "4.19.318", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.280", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.10.202", "lessThan": "5.11", "status": "affected", "versionType": "semver"}, {"version": "5.15.140", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "6.5.13", "lessThan": "6.6", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/clnt.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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:*:*:*:*:*:*:*:*", "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:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.13"}]}]}], "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"}], "title": "sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/clnt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1a713814e0580f946196bca5e340b37991c6e8bf", "status": "affected", "version": "7749fd2dbef72a52b5c9ffdbf877691950ed4680", "versionType": "git"}, {"lessThan": "f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd", "status": "affected", "version": "cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a", "versionType": "git"}, {"lessThan": "59527bbfb1eabdb28e95e7c725886cc2c2899cb3", "status": "affected", "version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "versionType": "git"}, {"lessThan": "e769fcde3cc73e847b1eb3acd40c04a291cb0c0c", "status": "affected", "version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "versionType": "git"}, {"lessThan": "cdf7a233cb94774b0e7df42d9157077983f5022c", "status": "affected", "version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "versionType": "git"}, {"lessThan": "932a8cf6abb2b2f8677b79153a823108d8861fe2", "status": "affected", "version": "bfca5fb4e97c46503ddfc582335917b0cc228264", "versionType": "git"}, {"status": "affected", "version": "17866066b8ac1cc38fb449670bc15dc9fee4b40a", "versionType": "git"}, {"status": "affected", "version": "7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5", "versionType": "git"}, {"status": "affected", "version": "dedf2a0eb9448ae73b270743e6ea9b108189df46", "versionType": "git"}, {"status": "affected", "version": "194454afa6aa9d6ed74f0c57127bc8beb27c20df", "versionType": "git"}, {"status": "affected", "version": "1cdb52ffd6600a37bd355d8dce58ecd03e55e618", "versionType": "git"}, {"lessThan": "6.1.191", "status": "affected", "version": "6.1.64", "versionType": "semver"}, {"lessThan": "6.6.160", "status": "affected", "version": "6.6.3", "versionType": "semver"}, {"lessThan": "4.20", "status": "affected", "version": "4.19.318", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.280", "versionType": "semver"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.202", "versionType": "semver"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.140", "versionType": "semver"}, {"lessThan": "6.6", "status": "affected", "version": "6.5.13", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/clnt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89543", "lastModified": "2026-10-30T13:20:20.340", "metrics": {}, "published": "2026-09-11T20:19:37.520", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a713814e0580f946196bca5e340b37991c6e8bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59527bbfb1eabdb28e95e7c725886cc2c2899cb3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/932a8cf6abb2b2f8677b79153a823108d8861fe2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cdf7a233cb94774b0e7df42d9157077983f5022c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Kernel: sunrpc use-after-free leading to Denial of Service", "id": "2532038", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532038"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the kernel's sunrpc component. A use-after-free vulnerability can occur due to improper handling of clnt->pipefs_sb pointers during mount and unmount events. This can lead to stale pointers, which, when accessed, may result in a system crash (Denial of Service)."], "name": "CVE-2026-89543", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:44:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89543\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89543\nhttps://git.kernel.org/stable/c/932a8cf6abb2b2f8677b79153a823108d8861fe2\nhttps://git.kernel.org/stable/c/cdf7a233cb94774b0e7df42d9157077983f5022c\nhttps://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfca5fb4e97c46503ddfc582335917b0cc228264,e769fcde3cc73e847b1eb3acd40c04a291cb0c0c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfca5fb4e97c46503ddfc582335917b0cc228264,cdf7a233cb94774b0e7df42d9157077983f5022c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bfca5fb4e97c46503ddfc582335917b0cc228264,932a8cf6abb2b2f8677b79153a823108d8861fe2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "17866066b8ac1cc38fb449670bc15dc9fee4b40a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "dedf2a0eb9448ae73b270743e6ea9b108189df46"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "194454afa6aa9d6ed74f0c57127bc8beb27c20df"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "7749fd2dbef72a52b5c9ffdbf877691950ed4680"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "1cdb52ffd6600a37bd355d8dce58ecd03e55e618"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.19.318,4.20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.280,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.202,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.140,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.64,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.5.13,6.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.3,6.7)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:30:07.741778+00:00", "updated": "2026-09-15T22:15:17.689475+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}