CVE-2026-74649

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It is reachable over the\nair, before association, during shared-key authentication. In the case\nof an overflow, the driver can write out of bounds. In the case of an\nunderfill, the driver can echo stale buffer memory.\n\nThe challenge text is defined to be exactly 128 octets, which is\nalready provided as the WLAN_AUTH_CHALLENGE_LEN define; require the\nelement to be exactly that length before use."}], "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 - A malicious AP on the same WiFi radio segment sends a crafted 802.11 authentication management frame; rtl8723bs receives it from the air via SDIO and dispatches it through mgt_dispatcher() to OnAuthClient() before association completes.\nAC:L - The rogue AP fully controls the malformed auth seq-2 response and its timing; once the client enters WEP shared-key authentication the attacker can reliably supply any challenge IE length up to 255 without races or conditions outside attacker control.\nPR:N - Exploitation requires no privileges on the victim host; a nearby attacker operating a malicious AP triggers the pre-association shared-key authentication handler without authenticating to the client or needing local shell or capability access.\nUI:N - No fresh victim interaction is needed at exploit time; evil-twin APs can invoke auto-connect to saved WEP profiles, and auth-algorithm auto-fallback from failed open auth can reach shared-key auth without a new user action during the attack.\nS:U - The overflow corrupts driver-private mlme_ext_info fields within the kernel WiFi driver context; impact remains within kernel/driver authority and does not cross a VM, container, or IOMMU security boundary.\nC:H - Underfill leaves stale data in the 128-byte chg_txt buffer that issue_auth() later transmits back to the attacker in auth seq 3, disclosing prior kernel memory; overflow also enables memory corruption paths that can yield further information disclosure.\nI:H - memcpy() uses attacker-controlled len (up to 255) into the fixed 128-byte chg_txt array, writing up to 127 bytes past the buffer into adjacent mlme_ext_info fields (aid, capability, HT/WMM structs, network IEs), enabling exploitable kernel memory corruption.\nA:H - Out-of-bounds writes into critical mlme_ext_info state in kernel context can corrupt driver data structures and trigger kernel oops, panic, or hang, causing complete loss of availability on affected embedded/mobile devices using this driver."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/staging/rtl8723bs/core/rtw_mlme_ext.c"], "versions": [{"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "39ae1033071001af9bb4573ebdbb43bbbe88f749", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "4ba402fd47009d20e51dbfc934abb562098ea35b", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "87c2f073d2aaea041d531b8e579c47570b54b3b7", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "a28a4b0592e4a37ea471bc0d308513a93133ce7e", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "6235b5156b48ed5d1ce3410d8f0b2fd67d30d944", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "2c56ef658ac8c6bca36bc5574715e8f717207c6c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": 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"2.0.3", "timestamp": "2026-10-16T19:13:51.847888Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:16:07.198Z"}}]}}

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It is reachable over the\nair, before association, during shared-key authentication. In the case\nof an overflow, the driver can write out of bounds. In the case of an\nunderfill, the driver can echo stale buffer memory.\n\nThe challenge text is defined to be exactly 128 octets, which is\nalready provided as the WLAN_AUTH_CHALLENGE_LEN define; require the\nelement to be exactly that length before use."}], "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 - A malicious AP on the same WiFi radio segment sends a crafted 802.11 authentication management frame; rtl8723bs receives it from the air via SDIO and dispatches it through mgt_dispatcher() to OnAuthClient() before association completes.\nAC:L - The rogue AP fully controls the malformed auth seq-2 response and its timing; once the client enters WEP shared-key authentication the attacker can reliably supply any challenge IE length up to 255 without races or conditions outside attacker control.\nPR:N - Exploitation requires no privileges on the victim host; a nearby attacker operating a malicious AP triggers the pre-association shared-key authentication handler without authenticating to the client or needing local shell or capability access.\nUI:N - No fresh victim interaction is needed at exploit time; evil-twin APs can invoke auto-connect to saved WEP profiles, and auth-algorithm auto-fallback from failed open auth can reach shared-key auth without a new user action during the attack.\nS:U - The overflow corrupts driver-private mlme_ext_info fields within the kernel WiFi driver context; impact remains within kernel/driver authority and does not cross a VM, container, or IOMMU security boundary.\nC:H - Underfill leaves stale data in the 128-byte chg_txt buffer that issue_auth() later transmits back to the attacker in auth seq 3, disclosing prior kernel memory; overflow also enables memory corruption paths that can yield further information disclosure.\nI:H - memcpy() uses attacker-controlled len (up to 255) into the fixed 128-byte chg_txt array, writing up to 127 bytes past the buffer into adjacent mlme_ext_info fields (aid, capability, HT/WMM structs, network IEs), enabling exploitable kernel memory corruption.\nA:H - Out-of-bounds writes into critical mlme_ext_info state in kernel context can corrupt driver data structures and trigger kernel oops, panic, or hang, causing complete loss of availability on affected embedded/mobile devices using this driver."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/staging/rtl8723bs/core/rtw_mlme_ext.c"], "versions": [{"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "39ae1033071001af9bb4573ebdbb43bbbe88f749", "status": "affected", "versionType": "git"}, {"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722", "status": "affected", "versionType": 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It is reachable over the\nair, before association, during shared-key authentication. In the case\nof an overflow, the driver can write out of bounds. In the case of an\nunderfill, the driver can echo stale buffer memory.\n\nThe challenge text is defined to be exactly 128 octets, which is\nalready provided as the WLAN_AUTH_CHALLENGE_LEN define; require the\nelement to be exactly that length before use."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nstaging: rtl8723bs: corregir la falta de comprobaci\u00f3n de longitud del desaf\u00edo de autenticaci\u00f3n de clave compartida\n\nEl gestor de autenticaci\u00f3n de clave compartida WEP utiliza la longitud controlada por el atacante del elemento de texto de desaf\u00edo sin comprobarla contra el b\u00fafer fijo chg_txt de 128 bytes.\n\nEn OnAuthClient() se utiliza la longitud de rtw_get_ie() - hasta 255 - para realizar memcpy() en pmlmeinfo -> chg_txt de 128 bytes, por lo que un AP malicioso que env\u00ede un elemento WLAN_EID_CHALLENGE malformado puede desbordar/subdesbordar chg_txt hasta en 127 bytes. Es alcanzable por aire, antes de la asociaci\u00f3n, durante la autenticaci\u00f3n de clave compartida. En el caso de un desbordamiento, el controlador puede escribir fuera de los l\u00edmites. En el caso de un subdesbordamiento, el controlador puede hacer eco de memoria de b\u00fafer obsoleta.\n\nEl texto de desaf\u00edo est\u00e1 definido para ser exactamente 128 octetos, lo cual ya se proporciona como la definici\u00f3n WLAN_AUTH_CHALLENGE_LEN; se requiere que el elemento tenga exactamente esa longitud antes de su uso."}], "id": "CVE-2026-74649", "lastModified": "2026-10-16T20:17:49.483", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74649", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:13:51.847888Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:38.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c56ef658ac8c6bca36bc5574715e8f717207c6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/39ae1033071001af9bb4573ebdbb43bbbe88f749"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ba402fd47009d20e51dbfc934abb562098ea35b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6235b5156b48ed5d1ce3410d8f0b2fd67d30d944"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/87c2f073d2aaea041d531b8e579c47570b54b3b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a28a4b0592e4a37ea471bc0d308513a93133ce7e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: staging: rtl8723bs: fix missing shared-key auth challenge length check", "id": "2521383", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521383"}, "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-120", "details": ["A flaw was found in the Linux kernel's rtl8723bs driver. A remote attacker, by operating a malicious Access Point (AP), could send a specially crafted Wi-Fi Protected Equivalent Privacy (WEP) shared-key authentication challenge. This could lead to an out-of-bounds write or information disclosure due to a missing length check when processing the challenge text, potentially allowing memory corruption or the exposure of sensitive data."], "name": "CVE-2026-74649", "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": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74649\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74649\nhttps://lore.kernel.org/linux-cve-announce/2026082225-CVE-2026-74649-aa8b@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,39ae1033071001af9bb4573ebdbb43bbbe88f749)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,4ba402fd47009d20e51dbfc934abb562098ea35b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,87c2f073d2aaea041d531b8e579c47570b54b3b7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,a28a4b0592e4a37ea471bc0d308513a93133ce7e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,6235b5156b48ed5d1ce3410d8f0b2fd67d30d944)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[554c0a3abf216c991c5ebddcdb2c08689ecd290b,2c56ef658ac8c6bca36bc5574715e8f717207c6c)"}}], "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": "generic", "value": "4.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.216,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.183,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.152,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.104,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.45,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.9,7.1.*]"}}, {"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": "2026-08-22T18:00:04.733736+00:00", "updated": "2026-08-25T07:30:12.104390+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}