Incorrect Synchronization The advisory has been revoked - it doesn't affect any version of package libperf (opens in a new tab)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-RHEL10-LIBPERF-18151097
- published22 Jul 2026
- disclosed19 Jul 2026
Introduced: 19 Jul 2026
CVE-2026-63858 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: add hook transactions for device deletions
Restore the flag that indicates that the hook is going away, ie. NFT_HOOK_REMOVE, but add a new transaction object to track deletion of hooks without altering the basechain/flowtable hook_list during the preparation phase.
The existing approach that moves the hook from the basechain/flowtable hook_list to transaction hook_list breaks netlink dump path readers of this RCU-protected list.
It should be possible use an array for nft_trans_hook to store the deleted hooks to compact the representation but I am not expecting many hook object, specially now that wildcard support for devices is in place.
Note that the nft_trans_chain_hooks() list contains a list of struct nft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while this list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE. Note that new commands can be updated to use nft_trans_hook for consistency.
This patch also adapts the event notification path to deal with the list of hook transactions.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2502303
- https://access.redhat.com/security/cve/CVE-2026-63858
- https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091
- https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c
- https://git.kernel.org/stable/c/768daa9f4276be4007e88dea61a378c8582ba008