CVE-2021-47388

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occur if it\nwas necessary to reallocate (parts of) the frame.\n\nFix this by reloading the variable after the code that results\nin the reallocations, if any.\n\nThis fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401."}], "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 vulnerable code runs in mac80211\u2019s over-the-air RX decrypt path (ieee80211_rx \u2192 ieee80211_rx_h_decrypt \u2192 ieee80211_crypto_ccmp/gcmp_decrypt) when processing CCMP/GCMP Wi\u2011Fi frames on the same RF/LAN segment, matching WiFi frame-injection Adjacent scoring\u2014not a local syscall-only path.\nAC:L - An adjacent peer that can send validly encrypted CCMP/GCMP frames (e.g., SoftAP client or associated station) can drive this decrypt path; the UAF was observed in normal RX on iwl3945/KFENCE, and UAF trigger conditions here are not an attacker-uncontrollable race.\nPR:N - Exploitation needs no account or capabilities on the victim host\u2014only the ability to deliver encrypted 802.11 frames that mac80211 decrypts (reasonable SoftAP/hotspot or peer scenarios), so privileges required are None.\nUI:N - Encrypted frame RX and decrypt run automatically in the mac80211 RX softirq/NAPI path whenever the interface is operating; no extra victim action is required at exploit time.\nS:U - Impact stays inside the host kernel wireless stack under the same OS security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - This is a use-after-free of skb header memory (ieee80211_is_frag(hdr) reads freed data); per scoring guidance a UAF enables control of freed-object contents and arbitrary-read primitives.\nI:H - Use-after-free of the reallocated frame buffer enables heap reuse/spray and escalation to write/control-flow hijack under standard kernel UAF exploitation models.\nA:H - The UAF read 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occur if it\nwas necessary to reallocate (parts of) the frame.\n\nFix this by reloading the variable after the code that results\nin the reallocations, if any.\n\nThis fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401."}, {"lang": "es", "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mac80211: corrige el use after free en CCMP/GCMP RX. Cuando se realiza la verificaci\u00f3n de PN en mac80211, para la fragmentaci\u00f3n necesitamos copiar el PN a la estructura RX para poder usarlo m\u00e1s tarde. para hacer una comparaci\u00f3n, desde la confirmaci\u00f3n bf30ca922a0c (\"mac80211: verifique la desfragmentaci\u00f3n PN con el marco actual\"). Desafortunadamente, en esa confirmaci\u00f3n utilic\u00e9 la variable 'hdr' sin que fuera necesariamente v\u00e1lida, por lo que podr\u00eda ocurrir un use after free si fuera necesario reasignar (partes de) el marco. Solucione este problema recargando la variable despu\u00e9s del c\u00f3digo que da como resultado las reasignaciones, si corresponde. Esto corrige https://bugzilla.kernel.org/show_bug.cgi?id=214401."}], "id": "CVE-2021-47388", "lastModified": "2026-08-04T10:17:01.107", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47388", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:38:19.729589Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:24.257", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mac80211: fix use-after-free in CCMP/GCMP RX", "id": "2282352", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282352"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmac80211: fix use-after-free in CCMP/GCMP RX\nWhen PN checking is done in mac80211, for fragmentation we need\nto copy the PN to the RX struct so we can later use it to do a\ncomparison, since commit bf30ca922a0c (\"mac80211: check defrag\nPN against current frame\").\nUnfortunately, in that commit I used the 'hdr' variable without\nit being necessarily valid, so use-after-free could occur if it\nwas necessary to reallocate (parts of) the frame.\nFix this by reloading the variable after the code that results\nin the reallocations, if any.\nThis fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47388", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47388\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47388\nhttps://lore.kernel.org/linux-cve-announce/2024052145-CVE-2021-47388-5715@gregkh/T"], "threat_severity": "Moderate"}

{}