Information Exposure Through Caching The advisory has been revoked - it doesn't affect any version of package libperf (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS10-LIBPERF-19876796
- published17 Sept 2026
- disclosed11 Sept 2026
Introduced: 11 Sep 2026
CVE-2026-89639 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by Centos.
In the Linux kernel, the following vulnerability has been resolved:
cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC
cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it cannot use cifs_resize_file_locked() to perform a proper fscache cookie resize. Instead, add cifs_invalidate_cache() after cifs_setsize().
cifs_invalidate_cache() calls fscache_invalidate(), which works without holding i_rwsem: it unconditionally increments inval_counter and sets FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not served once the cookie is later activated by fscache_use_cookie(). Truncation to zero leaves no valid cached data, making invalidation the correct semantic here.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2532382
- https://access.redhat.com/security/cve/CVE-2026-89639
- https://git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5
- https://git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45
- https://git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213