CVE-2026-68149: Linux, състезание за ресурс

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: facd61053cff100973921d4d45d47cf53c747ec6 преди b98fad81f1202b0eb26aacf3ff4cc7a21ed3b5bf; facd61053cff100973921d4d45d47cf53c747ec6 преди 834ddf899484a2f23129080e8773bc04f4691d07; facd61053cff100973921d4d45d47cf53c747ec6 преди a019b074903b3ad0a9726087efd0e8291452023b; facd61053cff100973921d4d45d47cf53c747ec6 преди ca03a7984a34f48085fd013e0d2cf4e6420b4acf; facd61053cff100973921d4d45d47cf53c747ec6 преди 4b9a5458d02e214ef2b384124ca626e3e381d778
• Linux Linux: 6.2; преди 6.2; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

Вид слабост

• CWE-662 Improper Synchronization

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-68149
• https://nvd.nist.gov/vuln/detail/CVE-2026-68149
• https://git.kernel.org/stable/c/b98fad81f1202b0eb26aacf3ff4cc7a21ed3b5bf
• https://git.kernel.org/stable/c/834ddf899484a2f23129080e8773bc04f4691d07
• https://git.kernel.org/stable/c/a019b074903b3ad0a9726087efd0e8291452023b
• https://git.kernel.org/stable/c/ca03a7984a34f48085fd013e0d2cf4e6420b4acf
• https://git.kernel.org/stable/c/4b9a5458d02e214ef2b384124ca626e3e381d778