Skip to content
Heist/ feed
Unrated

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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
Read the original announcement