FKIE_CVE-2026-89543
Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-11 20:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir
Normal client creation goes through rpc_setup_pipedir(), which records
clnt->pipefs_sb, but the mount-event path in __rpc_clnt_handle_event()
calls rpc_setup_pipedir_sb() directly and never refreshes that field.
The umount path also removes the directory without clearing
clnt->pipefs_sb.
After a late pipefs mount or any remount, rpc_clnt_remove_pipedir()
compares the current superblock against a stale pipefs_sb pointer and
skips cleanup, leaving pipefs dentries whose inode private data still
points at a freed rpc_clnt, leading to a potential use-after-free during
subsequent rpc_info_open() or rpc_show_info() calls.
Fix this by properly updating clnt->pipefs_sb upon mount events and
clearing it during unmount or failure paths.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"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": "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": "7749fd2dbef72a52b5c9ffdbf877691950ed4680",
"versionType": "git"
},
{
"status": "affected",
"version": "1cdb52ffd6600a37bd355d8dce58ecd03e55e618",
"versionType": "git"
},
{
"status": "affected",
"version": "cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a",
"versionType": "git"
},
{
"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": "6.2",
"status": "affected",
"version": "6.1.64",
"versionType": "semver"
},
{
"lessThan": "6.6",
"status": "affected",
"version": "6.5.13",
"versionType": "semver"
},
{
"lessThan": "6.7",
"status": "affected",
"version": "6.6.3",
"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": "6.18.*",
"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-rc1",
"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-\u003epipefs_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-\u003epipefs_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-\u003epipefs_sb upon mount events and\nclearing it during unmount or failure paths."
}
],
"id": "CVE-2026-89543",
"lastModified": "2026-09-11T20:19:37.520",
"metrics": {},
"published": "2026-09-11T20:19:37.520",
"references": [
{
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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