sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir
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.
CVE-2026-89543
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89543
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a",
"lessThan": "f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd",
"versionType": "git"
},
{
"status": "affected",
"version": "bfca5fb4e97c46503ddfc582335917b0cc228264",
"lessThan": "59527bbfb1eabdb28e95e7c725886cc2c2899cb3",
"versionType": "git"
},
{
"status": "affected",
"version": "bfca5fb4e97c46503ddfc582335917b0cc228264",
"lessThan": "e769fcde3cc73e847b1eb3acd40c04a291cb0c0c",
"versionType": "git"
},
{
"status": "affected",
"version": "bfca5fb4e97c46503ddfc582335917b0cc228264",
"lessThan": "cdf7a233cb94774b0e7df42d9157077983f5022c",
"versionType": "git"
},
{
"status": "affected",
"version": "bfca5fb4e97c46503ddfc582335917b0cc228264",
"lessThan": "932a8cf6abb2b2f8677b79153a823108d8861fe2",
"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": "6.6.3",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.318",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.280",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.202",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.140",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.64",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.5.13",
"lessThan": "6.6",
"versionType": "semver"
}
],
"programFiles": [
"net/sunrpc/clnt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sunrpc/clnt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89543
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46676 · Revision 1
- Added to Heist Feed
- Publisher date