fs: preserve ACL_DONT_CACHE state in forget_cached_acl() (CVE-2026-68149) | HOL Guard CVE

High · CVSS 8.4CVE-2026-68149

fs: preserve ACL_DONT_CACHE state in forget_cached_acl()

Answer in brief

CVE-2026-68149 records a High severity (CVSS 8.4) vulnerability in fs: preserve ACL_DONT_CACHE state in forget_cached_acl(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Aug 17, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=facd61053cff100973921d4d45d47cf53c747ec6 <b98fad81f1202b0eb26aacf3ff4cc7a21ed3b5bf \|\| >=facd61053cff100973921d4d45d47cf53c747ec6 <834ddf899484a2f23129080e8773bc04f4691d07 \|\| >=facd61053cff100973921d4d45d47cf53c747ec6 <a019b074903b3ad0a9726087efd0e8291452023b \|\| >=facd61053cff100973921d4d45d47cf53c747ec6 <ca03a7984a34f48085fd013e0d2cf4e6420b4acf \|\| >=facd61053cff100973921d4d45d47cf53c747ec6 <4b9a5458d02e214ef2b384124ca626e3e381d778	b98fad81f1202b0eb26aacf3ff4cc7a21ed3b5bf, 834ddf899484a2f23129080e8773bc04f4691d07, a019b074903b3ad0a9726087efd0e8291452023b, ca03a7984a34f48085fd013e0d2cf4e6420b4acf, 4b9a5458d02e214ef2b384124ca626e3e381d778
Linux/Linuxgeneric	6.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to b98fad81f1202b0eb26aacf3ff4cc7a21ed3b5bf if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: fs: preserve ACL_DONT_CACHE state in forget_cached_acl() The ACL_DONT_CACHE state is meant to be a constant state for the inode for filesystems that want to opt out of posix acl caching. Commit facd61053cff1 ("fuse: fixes after adapting to new posix acl api") used this facility to opt out of posix acl caching for fuse inodes with fuse server that does not negotiate FUSE_POSIX_ACL (fc->posix_acl). The commit also takes care to gate the forget_all_cached_acls() call in fuse_set_acl() on fc->posix_acl because there is no need for it, but there are other placed in fuse code which call forget_all_cached_acls() unconditional to fc->posix_acl and those cause the loss of the ACL_DONT_CACHE state. This is not only a functional bug. Properly timed, a get_acl() from this fuse filesystem can return a stale cached value, as was observed in tests, because set_acl() does not invalidate the unintentional acl cache. We could fix this in fuse, but it actually makes no sense for the vfs helper forget_cached_acl() to invalidate the ACL_DONT_CACHE state, so let it not do that to fix fuse and future users of ACL_DONT_CACHE.

Quoted source text, attributed separately from HOL analysis.