{"id":"CVE-2026-74340","state":"PUBLISHED","title":"wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication\n\nThe firmware-controlled rsp->count field is used as the loop bound for\nindexing into the flexible rsp->regs[] array without validation against\nthe message length. A count exceeding the actual data causes out-of-\nbounds reads from the heap-allocated message buffer.\n\nAdd a check that count fits within the received message.","publishedAt":"2026-08-15T05:58:30.558Z","updatedAt":"2026-10-16T18:55:34.097Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"22b0b8572a64362531dd0ed499b75e16282aeb2b","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"3cf92b44c4fb88a5e8de8733a4494c0956606bca","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"0907c06dccae9e3c8d5a68eb9014beec73a36e79","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"64228dfc4247aca178c01e5a37af7d8dcc7a6089","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"23d210877968657bd07e1a517e0b516db20a1d80","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"f03782f7f41f2afee5076a1ef08ced5649218771","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"f987efff29a5fe45320ea5991c9d5cb98b676953","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"df2187acfca6c6cca372c5d35f42394d9c270b09","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/wcn36xx/smd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.11","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/wcn36xx/smd.c"]}],"references":["https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b","https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca","https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79","https://git.kernel.org/stable/c/64228dfc4247aca178c01e5a37af7d8dcc7a6089","https://git.kernel.org/stable/c/23d210877968657bd07e1a517e0b516db20a1d80","https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771","https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953","https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74340.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74340","state":"PUBLISHED","datePublished":"2026-08-15T05:58:30.558Z","dateUpdated":"2026-10-16T18:55:34.097Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.885Z"},"containers":{"cna":{"title":"wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication\n\nThe firmware-controlled rsp->count field is used as the loop bound for\nindexing into the flexible rsp->regs[] array without validation against\nthe message length. A count exceeding the actual data causes out-of-\nbounds reads from the heap-allocated message buffer.\n\nAdd a check that count fits within the received message."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"22b0b8572a64362531dd0ed499b75e16282aeb2b","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"3cf92b44c4fb88a5e8de8733a4494c0956606bca","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"0907c06dccae9e3c8d5a68eb9014beec73a36e79","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"64228dfc4247aca178c01e5a37af7d8dcc7a6089","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"23d210877968657bd07e1a517e0b516db20a1d80","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"f03782f7f41f2afee5076a1ef08ced5649218771","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"f987efff29a5fe45320ea5991c9d5cb98b676953","versionType":"git"},{"version":"43efa3c0f241e04862be8e6a68ff765d36cde1ba","status":"affected","lessThan":"df2187acfca6c6cca372c5d35f42394d9c270b09","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/wcn36xx/smd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.11","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/wcn36xx/smd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b"},{"url":"https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca"},{"url":"https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79"},{"url":"https://git.kernel.org/stable/c/64228dfc4247aca178c01e5a37af7d8dcc7a6089"},{"url":"https://git.kernel.org/stable/c/23d210877968657bd07e1a517e0b516db20a1d80"},{"url":"https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771"},{"url":"https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953"},{"url":"https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The bug is reached when WCN3660/3680 firmware delivers a PRINT_REG_INFO_IND over the WLAN_CTRL rpmsg channel; crafted 802.11 traffic in radio range can cause the firmware to emit this malformed indication on Qualcomm Android phones and tablets using wcn36xx.\nAC:L - An adjacent attacker can repeatedly transmit WiFi frames during background scanning or association to elicit the firmware indication, then set count far above the short rpmsg payload; the driver loop performs deterministic out-of-bounds reads until a fault occurs.\nPR:N - Exploitation requires no local account or kernel privileges on the victim; only radio proximity to a device with the wcn36xx driver loaded and WiFi active, which is the default state on typical mobile deployments of this chipset.\nUI:N - No specific victim action beyond normal WiFi operation is required; phones continuously scan and associate automatically, allowing an adjacent attacker to trigger the firmware indication passively or via a rogue access point.\nS:U - The out-of-bounds read occurs in kernel heap memory during wcn36xx firmware message handling, enabling standard kernel information disclosure or denial of service rather than crossing a VM, IOMMU, or other separate security authority boundary.\nC:H - The unchecked firmware count allows unbounded out-of-bounds reads from the kmalloc_flex indication buffer into adjacent kernel heap objects; with debug_mask set the leaked register values are printed to the kernel log, and the reads themselves expose sensitive heap contents.\nI:N - This is a read-only out-of-bounds access that indexes past the message buffer without writing memory; the loop only reads addr/value pairs for debug logging and does not corrupt heap metadata or provide an arbitrary write primitive.\nA:H - A firmware-controlled count near UINT_MAX causes the handler to perform massive out-of-bounds reads past the kmalloc allocation, reliably triggering a kernel page fault, oops, or panic and denying all system and wireless availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:46:06.162Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74340","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T18:53:57.508619Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:34.097Z"}}]}}}