{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74323","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.884Z","datePublished":"2026-08-15T05:58:18.857Z","dateUpdated":"2026-08-17T05:45:53.522Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:45:53.522Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb()\n\nIf link_conf or link_sta lookup fails in mt7996_tx_prepare_skb routine,\nmt7996 driver leaks an already allocated tx token. Fix the issue\nreleasing the token in case of error."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The flaw is in mt7996 TX preparation for EAPOL frames on MLO stations; a nearby WiFi attacker can trigger WPA authentication/rekey traffic that drives this driver TX path on APs, routers, and clients using MediaTek mt7996 hardware.\nAC:L - An attacker can repeatedly initiate or tear down MLO associations and EAPOL exchanges to hit the narrow window where link_conf/link_sta are NULL during TX, reliably leaking tokens without depending on uncontrollable system state.\nPR:N - Exploitation requires only an unauthenticated adjacent WiFi peer initiating or disrupting MLO WPA handshakes that cause EAPOL transmission; no local account, capability, or init-namespace root access is needed on the victim.\nUI:N - No victim user action such as opening files or clicking prompts is required; the attacker alone can generate the authentication traffic needed to reach the vulnerable EAPOL TX path.\nS:U - Impact is confined to the kernel wireless subsystem on the affected host (token exhaustion and potential memory corruption); it does not cross VM, container, or IOMMU security boundaries.\nC:H - Leaked tokens leave stale idr entries pointing at txwi_cache structures that dma.c returns to the free pool, enabling reuse of the same cache while orphaned entries retain dangling skb pointers that can be dereferenced on later token operations.\nI:H - Reusing txwi_cache buffers still referenced by leaked token IDs can corrupt in-flight TX metadata and skb associations, providing a plausible path to controlled memory corruption and kernel code execution beyond simple resource loss.\nA:H - Each leak permanently consumes one of 16384 TX tokens; sustained triggering exhausts the pool, invokes __mt76_set_tx_blocked(), and halts all wireless transmission on the interface, constituting a repeatable denial of service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/mediatek/mt76/mt7996/mac.c","drivers/net/wireless/mediatek/mt76/tx.c"],"versions":[{"version":"7ef0c7ad735b0c38140259519a3f165bee2b857c","lessThan":"06e65d6cf80490bc0457d339595d1ed5a89e8899","status":"affected","versionType":"git"},{"version":"7ef0c7ad735b0c38140259519a3f165bee2b857c","lessThan":"fa0e9aa92a7bc97fc42014c5efaaf1278fa92723","status":"affected","versionType":"git"},{"version":"7ef0c7ad735b0c38140259519a3f165bee2b857c","lessThan":"831074096d0450308357271fc0ffd3f600a2487e","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/mediatek/mt76/mt7996/mac.c","drivers/net/wireless/mediatek/mt76/tx.c"],"versions":[{"version":"6.18","status":"affected"},{"version":"0","lessThan":"6.18","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/06e65d6cf80490bc0457d339595d1ed5a89e8899"},{"url":"https://git.kernel.org/stable/c/fa0e9aa92a7bc97fc42014c5efaaf1278fa92723"},{"url":"https://git.kernel.org/stable/c/831074096d0450308357271fc0ffd3f600a2487e"}],"title":"wifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb()","x_generator":{"engine":"bippy-1.2.0"}}}}