CVE-2026-80635

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80635", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.777Z", "datePublished": "2026-08-28T06:48:49.637Z", "dateUpdated": "2026-08-29T06:21:35.535Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:35.535Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\n\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\n\nAdd validation that the response includes the candidate data."}], "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 bug is in parsing a WLAN firmware HAL response during TX block-ack setup; that path is reached only when an adjacent 802.11 peer drives AMPDU/BA negotiation over WiFi, not via remote IP or local syscalls.\nAC:L - An adjacent attacker can repeatedly send QoS data to a victim using wcn36xx to force ieee80211_start_tx_ba_session and wcn36xx_smd_trigger_ba, retrying until firmware returns a short TRIGGER_BA_RSP with candidate_cnt>=1.\nPR:N - Exploitation requires only wireless adjacency as an associated AP or client peer; no Linux account, capabilities, or user-namespace privileges on the victim host are needed.\nUI:N - The victim needs no deliberate action beyond normal WiFi use; the attacker triggers BA setup by sending traffic that causes automatic AMPDU aggregation on the victim interface.\nS:U - Impact is confined to the kernel WiFi driver and its firmware session state on the same host; it does not cross VM, container, or IOMMU security boundaries.\nC:H - When candidate_cnt>=1 but the response is only 20 bytes, the driver OOB-reads a 22-byte candidate from stale hal_buf data beyond the message, disclosing adjacent kernel buffer contents that may include prior HAL keying material.\nI:H - Stale OOB data is copied into ba_info and used as the block-ack starting sequence number for wcn36xx_smd_add_ba_session, corrupting BA session state and subsequent driver/firmware behavior.\nA:H - Corrupted block-ack parameters and malformed firmware/driver state can destabilize the WLAN subsystem, causing connection loss, firmware/driver errors, or kernel crashes under repeated attack."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/wcn36xx/smd.c"], "versions": [{"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "04aba50212f9f274e1a726fb3873b5ce8da2d821", "status": "affected", "versionType": "git"}, {"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "c07aa0534d50361183833e3803204044cf1d0476", "status": "affected", "versionType": "git"}, {"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35", "status": "affected", "versionType": "git"}, {"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee", "status": "affected", "versionType": "git"}, {"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2", "status": "affected", "versionType": "git"}, {"version": "16be1ac55944412e8d132b1db26f994b368c5742", "lessThan": "b5e6f21923ca89d90256e7346301056f6502691e", "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/ath/wcn36xx/smd.c"], "versions": [{"version": "4.7", "status": "affected"}, {"version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "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": "4.7", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/04aba50212f9f274e1a726fb3873b5ce8da2d821"}, {"url": "https://git.kernel.org/stable/c/c07aa0534d50361183833e3803204044cf1d0476"}, {"url": "https://git.kernel.org/stable/c/d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35"}, {"url": "https://git.kernel.org/stable/c/af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee"}, {"url": "https://git.kernel.org/stable/c/d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2"}, {"url": "https://git.kernel.org/stable/c/b5e6f21923ca89d90256e7346301056f6502691e"}], "title": "wifi: wcn36xx: fix OOB read from short trigger BA firmware response", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/wcn36xx/smd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "04aba50212f9f274e1a726fb3873b5ce8da2d821", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}, {"lessThan": "c07aa0534d50361183833e3803204044cf1d0476", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}, {"lessThan": "d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}, {"lessThan": "af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}, {"lessThan": "d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}, {"lessThan": "b5e6f21923ca89d90256e7346301056f6502691e", "status": "affected", "version": "16be1ac55944412e8d132b1db26f994b368c5742", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/wcn36xx/smd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.7"}, {"lessThan": "4.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\n\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\n\nAdd validation that the response includes the candidate data."}], "id": "CVE-2026-80635", "lastModified": "2026-08-29T07:16:47.537", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-28T08:16:48.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/04aba50212f9f274e1a726fb3873b5ce8da2d821"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b5e6f21923ca89d90256e7346301056f6502691e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c07aa0534d50361183833e3803204044cf1d0476"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: wifi: wcn36xx: fix OOB read from short trigger BA firmware response", "id": "2525410", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525410"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\nAdd validation that the response includes the candidate data.", "A flaw was found in the Linux kernel's wcn36xx Wi-Fi driver. This vulnerability occurs because the driver does not adequately validate the length of certain firmware responses. An attacker could potentially craft a malicious firmware response, leading to an out-of-bounds read of stale heap data. This can result in the corruption of the Block Acknowledgement (BA) session state, potentially causing a denial of service or information disclosure."], "name": "CVE-2026-80635", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80635\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80635\nhttps://lore.kernel.org/linux-cve-announce/2026082839-CVE-2026-80635-6b91@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,04aba50212f9f274e1a726fb3873b5ce8da2d821)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,c07aa0534d50361183833e3803204044cf1d0476)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[16be1ac55944412e8d132b1db26f994b368c5742,b5e6f21923ca89d90256e7346301056f6502691e)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "4.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T09:30:18.290540+00:00", "updated": "2026-09-02T06:00:07.365960+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}