{"api_version":"1","generated_at":"2026-08-13T22:05:23+00:00","cve":"CVE-2026-68409","urls":{"html":"https://cve.report/CVE-2026-68409","api":"https://cve.report/api/cve/CVE-2026-68409.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68409","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68409"},"summary":{"title":"wifi: mac80211: defer link RX stats percpu free to RCU","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: defer link RX stats percpu free to RCU\n\nsta_remove_link() frees a removed MLO link's RX stats percpu buffer right\naway, but defers only the link container to RCU:\n\n\tsta_info_free_link(&alloc->info);\n\tkfree_rcu(alloc, rcu_head);\n\nThe RX fast path reads link_sta under rcu_read_lock and writes the percpu\nstats. A reader that resolved link_sta before the removal keeps the\npointer. The container stays alive from the kfree_rcu, so the read still\nworks. But the percpu block it points to is already freed. This needs\nuses_rss. That is when pcpu_rx_stats exists.\n\nThe full STA teardown frees the deflink stats only after\nsynchronize_net(). The link removal path had no such barrier. The race is\nhard to win in practice, but the free should still wait for RCU.\n\nFree the link together with its data from a single RCU callback, so the\npercpu block is reclaimed only after readers drain.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:34","updated_at":"2026-08-10 13:20:34"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a03fceae0c65b31ce31840dac5e26684ceecb65b","name":"https://git.kernel.org/stable/c/a03fceae0c65b31ce31840dac5e26684ceecb65b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2aa1789880fa5e41049b0f6a74a4fc2fa1997610","name":"https://git.kernel.org/stable/c/2aa1789880fa5e41049b0f6a74a4fc2fa1997610","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aa2eb62525188269cdd402a583b9a8ed94657ff0","name":"https://git.kernel.org/stable/c/aa2eb62525188269cdd402a583b9a8ed94657ff0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68409","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68409","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c71420db653aba30a234d1e4cf86dde376e604fa 2aa1789880fa5e41049b0f6a74a4fc2fa1997610 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c71420db653aba30a234d1e4cf86dde376e604fa a03fceae0c65b31ce31840dac5e26684ceecb65b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c71420db653aba30a234d1e4cf86dde376e604fa aa2eb62525188269cdd402a583b9a8ed94657ff0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mac80211/sta_info.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2aa1789880fa5e41049b0f6a74a4fc2fa1997610","status":"affected","version":"c71420db653aba30a234d1e4cf86dde376e604fa","versionType":"git"},{"lessThan":"a03fceae0c65b31ce31840dac5e26684ceecb65b","status":"affected","version":"c71420db653aba30a234d1e4cf86dde376e604fa","versionType":"git"},{"lessThan":"aa2eb62525188269cdd402a583b9a8ed94657ff0","status":"affected","version":"c71420db653aba30a234d1e4cf86dde376e604fa","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mac80211/sta_info.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc4","versionStartIncluding":"6.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: defer link RX stats percpu free to RCU\n\nsta_remove_link() frees a removed MLO link's RX stats percpu buffer right\naway, but defers only the link container to RCU:\n\n\tsta_info_free_link(&alloc->info);\n\tkfree_rcu(alloc, rcu_head);\n\nThe RX fast path reads link_sta under rcu_read_lock and writes the percpu\nstats. A reader that resolved link_sta before the removal keeps the\npointer. The container stays alive from the kfree_rcu, so the read still\nworks. But the percpu block it points to is already freed. This needs\nuses_rss. That is when pcpu_rx_stats exists.\n\nThe full STA teardown frees the deflink stats only after\nsynchronize_net(). The link removal path had no such barrier. The race is\nhard to win in practice, but the free should still wait for RCU.\n\nFree the link together with its data from a single RCU callback, so the\npercpu block is reclaimed only after readers drain."}],"providerMetadata":{"dateUpdated":"2026-08-10T12:04:29.238Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2aa1789880fa5e41049b0f6a74a4fc2fa1997610"},{"url":"https://git.kernel.org/stable/c/a03fceae0c65b31ce31840dac5e26684ceecb65b"},{"url":"https://git.kernel.org/stable/c/aa2eb62525188269cdd402a583b9a8ed94657ff0"}],"title":"wifi: mac80211: defer link RX stats percpu free to RCU","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68409","datePublished":"2026-08-10T12:04:29.238Z","dateReserved":"2026-07-30T09:28:09.390Z","dateUpdated":"2026-08-10T12:04:29.238Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:34","lastModifiedDate":"2026-08-10 13:20:34","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68409","Ordinal":"1","Title":"wifi: mac80211: defer link RX stats percpu free to RCU","CVE":"CVE-2026-68409","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68409","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: defer link RX stats percpu free to RCU\n\nsta_remove_link() frees a removed MLO link's RX stats percpu buffer right\naway, but defers only the link container to RCU:\n\n\tsta_info_free_link(&alloc->info);\n\tkfree_rcu(alloc, rcu_head);\n\nThe RX fast path reads link_sta under rcu_read_lock and writes the percpu\nstats. A reader that resolved link_sta before the removal keeps the\npointer. The container stays alive from the kfree_rcu, so the read still\nworks. But the percpu block it points to is already freed. This needs\nuses_rss. That is when pcpu_rx_stats exists.\n\nThe full STA teardown frees the deflink stats only after\nsynchronize_net(). The link removal path had no such barrier. The race is\nhard to win in practice, but the free should still wait for RCU.\n\nFree the link together with its data from a single RCU callback, so the\npercpu block is reclaimed only after readers drain.","Type":"Description","Title":"wifi: mac80211: defer link RX stats percpu free to RCU"}]}}}