Answer in brief
CVE-2026-68409 records a High severity (CVSS 8.8) vulnerability in wifi: mac80211: defer link RX stats percpu free to RCU. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c71420db653aba30a234d1e4cf86dde376e604fa <2aa1789880fa5e41049b0f6a74a4fc2fa1997610 || >=c71420db653aba30a234d1e4cf86dde376e604fa <a03fceae0c65b31ce31840dac5e26684ceecb65b || >=c71420db653aba30a234d1e4cf86dde376e604fa <aa2eb62525188269cdd402a583b9a8ed94657ff0 | 2aa1789880fa5e41049b0f6a74a4fc2fa1997610, a03fceae0c65b31ce31840dac5e26684ceecb65b, aa2eb62525188269cdd402a583b9a8ed94657ff0 |
| Linux/Linuxgeneric | 6.0 | Not reported |
| Linux/Linuxgeneric | >=c71420db653aba30a234d1e4cf86dde376e604fa <a5afc00280986063f1c355821544fabbb2a960f7 || >=c71420db653aba30a234d1e4cf86dde376e604fa <b679c1cffb2f3d0854b8b05ea9e909ad6489046f || >=c71420db653aba30a234d1e4cf86dde376e604fa <2aa1789880fa5e41049b0f6a74a4fc2fa1997610 || >=c71420db653aba30a234d1e4cf86dde376e604fa <a03fceae0c65b31ce31840dac5e26684ceecb65b || >=c71420db653aba30a234d1e4cf86dde376e604fa <aa2eb62525188269cdd402a583b9a8ed94657ff0 | a5afc00280986063f1c355821544fabbb2a960f7, b679c1cffb2f3d0854b8b05ea9e909ad6489046f, 2aa1789880fa5e41049b0f6a74a4fc2fa1997610, a03fceae0c65b31ce31840dac5e26684ceecb65b, aa2eb62525188269cdd402a583b9a8ed94657ff0 |
| Linux/Linuxgeneric | >=c71420db653aba30a234d1e4cf86dde376e604fa <acd5931d5adf12f0163f83dc00320e7011f4da92 || >=c71420db653aba30a234d1e4cf86dde376e604fa <a5afc00280986063f1c355821544fabbb2a960f7 || >=c71420db653aba30a234d1e4cf86dde376e604fa <b679c1cffb2f3d0854b8b05ea9e909ad6489046f || >=c71420db653aba30a234d1e4cf86dde376e604fa <2aa1789880fa5e41049b0f6a74a4fc2fa1997610 || >=c71420db653aba30a234d1e4cf86dde376e604fa <a03fceae0c65b31ce31840dac5e26684ceecb65b || >=c71420db653aba30a234d1e4cf86dde376e604fa <aa2eb62525188269cdd402a583b9a8ed94657ff0 | acd5931d5adf12f0163f83dc00320e7011f4da92, a5afc00280986063f1c355821544fabbb2a960f7, b679c1cffb2f3d0854b8b05ea9e909ad6489046f, 2aa1789880fa5e41049b0f6a74a4fc2fa1997610, a03fceae0c65b31ce31840dac5e26684ceecb65b, aa2eb62525188269cdd402a583b9a8ed94657ff0 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.