In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: defer link RX stats percpu free to RCU
sta_remove_link() frees a removed MLO link's RX stats percpu buffer right away, but defers only the link container to RCU:
sta_info_free_link(&alloc->info); kfree_rcu(alloc, rcu_head);
The RX fast path reads link_sta under rcu_read_lock and writes the percpu stats. A reader that resolved link_sta before the removal keeps the pointer. The container stays alive from the kfree_rcu, so the read still works. But the percpu block it points to is already freed. This needs uses_rss. That is when pcpu_rx_stats exists.
The full STA teardown frees the deflink stats only after synchronize_net(). The link removal path had no such barrier. The race is hard to win in practice, but the free should still wait for RCU.
Free the link together with its data from a single RCU callback, so the percpu block is reclaimed only after readers drain.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Aug 17, 2026 | Aug 10, 2026 |
| Rocky_linux | — | Upgrade libperf-debuginfoUpgrade kernel-coreUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-tools-libs-develUpgrade kernel-debug-devel-matchedUpgrade kernel-modulesUpgrade kernel-debug-debuginfoUpgrade kernel-debug-develUpgrade kernel-rt-modules-coreUpgrade kernel-uki-virtUpgrade kernel-debug-modules-coreUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-devel-matchedUpgrade kernel-debuginfo-common-s390xUpgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdump-coreUpgrade libperfUpgrade rtlaUpgrade kernel-zfcpdump-develUpgrade kernel-rt-debug-develUpgrade kernel-modules-coreUpgrade kernel-zfcpdump-modulesUpgrade kernel-modules-extra-matchedUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-uki-virt-addonsUpgrade kernel-rt-modules-extraUpgrade kernel-rt-modulesUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade kernel-rt-debugUpgrade kernel-rt-debug-coreUpgrade kernel-debugUpgrade kernel-debug-coreUpgrade kernel-rt-debug-debuginfoUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-develUpgrade kernel-rt-debuginfoUpgrade kernel-zfcpdumpUpgrade kernel-rt-develUpgrade kernel-rtUpgrade perfUpgrade kernel-rt-debug-modulesUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-modules-extraUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-uki-virtUpgrade rvUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-coreUpgrade python3-perf-debuginfo | Sep 15, 2026 | Sep 10, 2026 |
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