wifi: mac80211: defer link RX stats percpu free to RCU
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.
CVE-2026-68409
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68409
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c71420db653aba30a234d1e4cf86dde376e604fa",
"lessThan": "a5afc00280986063f1c355821544fabbb2a960f7",
"versionType": "git"
},
{
"status": "affected",
"version": "c71420db653aba30a234d1e4cf86dde376e604fa",
"lessThan": "b679c1cffb2f3d0854b8b05ea9e909ad6489046f",
"versionType": "git"
},
{
"status": "affected",
"version": "c71420db653aba30a234d1e4cf86dde376e604fa",
"lessThan": "2aa1789880fa5e41049b0f6a74a4fc2fa1997610",
"versionType": "git"
},
{
"status": "affected",
"version": "c71420db653aba30a234d1e4cf86dde376e604fa",
"lessThan": "a03fceae0c65b31ce31840dac5e26684ceecb65b",
"versionType": "git"
},
{
"status": "affected",
"version": "c71420db653aba30a234d1e4cf86dde376e604fa",
"lessThan": "aa2eb62525188269cdd402a583b9a8ed94657ff0",
"versionType": "git"
}
],
"programFiles": [
"net/mac80211/sta_info.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mac80211/sta_info.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68409
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46474 · Revision 1
- Added to Heist Feed
- Publisher date