CVE-2026-89543
Full vulnerability record from the local CVENow database.
Description
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:37.520000
Last modified
2026-10-30 13:20:20.340000
View original CVE JSON
{
"id": "CVE-2026-89543",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-11T20:19:37.520",
"lastModified": "2026-10-30T13:20:20.340",
"vulnStatus": "Received",
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/sunrpc/clnt.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
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"lessThan": "1a713814e0580f946196bca5e340b37991c6e8bf",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd",
"versionType": "git",
"status": "affected"
},
{
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{
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{
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{
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{
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"status": "affected"
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{
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},
{
"version": "6.1.64",
"lessThan": "6.1.191",
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"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": "6.5.13",
"lessThan": "6.6",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/sunrpc/clnt.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.7",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.7",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.111",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/1a713814e0580f946196bca5e340b37991c6e8bf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/59527bbfb1eabdb28e95e7c725886cc2c2899cb3",
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/e769fcde3cc73e847b1eb3acd40c04a291cb0c0c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}