CVE-2026-68409

CVE CVE-2026-68409EUVD EUVD-2026-55595Published 2026-08-10T12:04:29.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 0; c71420db653aba30a234d1e4cf86dde376e604fa <aa2eb62525188269cdd402a583b9a8ed94657ff0; patch: 6.18.42; c71420db653aba30a234d1e4cf86dde376e604fa <a03fceae0c65b31ce31840dac5e26684ceecb65b; 6.0; c71420db653aba30a234d1e4cf86dde376e604fa <2aa1789880fa5e41049b0f6a74a4fc2fa1997610; patch: 7.2-rc4; patch: 7.1.6

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.