CVE-2026-68399 (GCVE-0-2026-68399)
Vulnerability from cvelistv5
Published
2026-08-10 12:04
Modified
2026-10-21 12:43
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix UAF in sock clone early bailouts Similar to recent commit 9b51a6155d14 ("bpf,fork: wipe ->bpf_storage before bailouts that access it"), sk_clone() performs an initial shallow copy of the socket field ->sk_bpf_storage via sock_copy() for the cloned socket newsk. If sk_clone() bails out early (e.g. if sk_filter_charge() fails) prior to calling bpf_sk_storage_clone(), newsk->sk_bpf_storage still points to the parent socket's BPF local storage. When newsk is subsequently freed via sk_free(), the deallocation path (__sk_destruct() -> bpf_sk_storage_free()) destroys the parent socket's BPF local storage, leading to a use-after-free (UAF) on the parent socket. Fix this by resetting newsk->sk_bpf_storage to NULL immediately after sock_copy() in sk_clone(), and remove the now redundant initialization from bpf_sk_storage_clone().
References
Impacted products
Vendor Product Version
Linux Linux Version: 6ac99e8f23d4b10258406ca0dd7bffca5f31da9d
Version: 6ac99e8f23d4b10258406ca0dd7bffca5f31da9d
Version: 6ac99e8f23d4b10258406ca0dd7bffca5f31da9d
Version: 6ac99e8f23d4b10258406ca0dd7bffca5f31da9d
Version: 6ac99e8f23d4b10258406ca0dd7bffca5f31da9d
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