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sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.191, 6.12.111, 6.18.50, 6.6.160, 7.2.4
CVEs
CVE-2026-89543
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 00:54 UTC · Revision 1

Source evidence

sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir

core-osv · Original source

Published 11 Sept 2026, 19:44 UTC

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.

osv:CVE-2026-89543

Kernel

Fixed versions: 6.1.191, 6.6.160, 6.12.111, 6.18.50, 7.2.4

Complete source record
{
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  "url": "https://osv.dev/vulnerability/CVE-2026-89543",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir",
    "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.",
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      "modified": "2026-11-01T02:30:49.484694417Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1a713814e0580f946196bca5e340b37991c6e8bf",
        "https://git.kernel.org/stable/c/59527bbfb1eabdb28e95e7c725886cc2c2899cb3",
        "https://git.kernel.org/stable/c/932a8cf6abb2b2f8677b79153a823108d8861fe2",
        "https://git.kernel.org/stable/c/cdf7a233cb94774b0e7df42d9157077983f5022c",
        "https://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c",
        "https://git.kernel.org/stable/c/f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89543.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89543",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "related_cves": [
      {
        "value": "CVE-2026-89543",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508691,
  "published_at": "2026-09-11T19:44:19.679+00:00"
}