CVE-2024-46865

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A remote attacker anywhere on the network can drive this path with crafted packets.\nAC:L - The attacker can flood the FOU port continuously so a packet is always in flight, and FOU/netns teardown (the window where sk_user_data is NULL) is routine, frequent churn on container and cloud hosts that use FOU-encapsulated tunnels. The attacker also controls the value in the uninitialized stack slot by first sending a GUE packet with GUE_PFLAG_REMCSUM, which stores attacker-derived offset/delta into that exact frame slot in the same function.\nPR:N - There is no authentication, credential check, or capability test anywhere between packet reception and gue_gro_receive; the FOU socket accepts unsolicited datagrams. No local account or privilege of any kind is required.\nUI:N - Exploitation occurs entirely in softirq context on packet receipt with no victim action required.\nS:U - The uninitialized-value use and the resulting write both occur within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The bug reads uninitialized kernel stack memory and folds it into a 16-bit value written into an in-flight network buffer, and the same defect provides an out-of-bounds write primitive at a partially attacker-influenced offset, which under kernel scoring practice is treated as leverageable for arbitrary memory disclosure.\nI:H - remcsum_unadjust() performs a 2-byte write through a pointer computed from the uninitialized (and attacker-groomable) grc->offset; when the size_t arithmetic wraps the write lands far outside any legitimate buffer, giving an out-of-bounds write into kernel memory that can be leveraged for control-flow-relevant corruption.\nA:H - The wild-pointer 2-byte write at frag0 + ~4GiB faults on unmapped kernel memory and oopses in softirq context, and the surrounding corruption of GRO/checksum state destabilises the receive path \u2014 a remote unauthenticated kernel crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "231c235d2f7a66f018f172e26ffd47c363f244ef", "lessThan": "392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e", "versionType": "git"}, {"status": "affected", "version": "4494bccb52ffda22ce5a1163a776d970e6229e08", "lessThan": "16ff0895283058b0f96d4fe277aa25ee096f0ea8", "versionType": "git"}, {"status": "affected", "version": "d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3", "lessThan": "5d537b8d900514509622ce92330b70d2e581d409", "versionType": "git"}, {"status": "affected", "version": "1df42be305fe478ded1ee0c1d775f4ece713483b", "lessThan": "7ae890ee19479eeeb87724cca8430b5cb3660c74", "versionType": "git"}, {"status": "affected", "version": "c46cd6aaca81040deaea3500ba75126963294bd9", "lessThan": "aca06c617c83295f0caa486ad608fbef7bdc11e8", "versionType": "git"}, {"status": "affected", "version": "7e4196935069947d8b70b09c1660b67b067e75cb", "lessThan": "4c8002277167125078e6b9b90137bdf443ebaa08", "versionType": "git"}], "programFiles": ["net/ipv4/fou_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10.226", "lessThan": "5.10.227", "versionType": "semver"}, {"status": "affected", "version": "5.15.167", "lessThan": "5.15.168", "versionType": "semver"}, {"status": "affected", "version": "6.1.110", "lessThan": "6.1.111", "versionType": "semver"}, {"status": "affected", "version": "6.6.51", "lessThan": "6.6.52", "versionType": "semver"}, {"status": "affected", "version": "6.10.10", "lessThan": "6.10.11", "versionType": "semver"}], "programFiles": ["net/ipv4/fou_core.c"], "defaultStatus": "unaffected"}], "references": [{"url": "https://git.kernel.org/stable/c/392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e"}, {"url": "https://git.kernel.org/stable/c/16ff0895283058b0f96d4fe277aa25ee096f0ea8"}, {"url": "https://git.kernel.org/stable/c/5d537b8d900514509622ce92330b70d2e581d409"}, {"url": "https://git.kernel.org/stable/c/7ae890ee19479eeeb87724cca8430b5cb3660c74"}, {"url": "https://git.kernel.org/stable/c/aca06c617c83295f0caa486ad608fbef7bdc11e8"}, {"url": "https://git.kernel.org/stable/c/4c8002277167125078e6b9b90137bdf443ebaa08"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: fix initialization of grc\n\nThe grc must be initialize first. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/fou_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e", "status": "affected", "version": "231c235d2f7a66f018f172e26ffd47c363f244ef", "versionType": "git"}, {"lessThan": "16ff0895283058b0f96d4fe277aa25ee096f0ea8", "status": "affected", "version": "4494bccb52ffda22ce5a1163a776d970e6229e08", "versionType": "git"}, {"lessThan": "5d537b8d900514509622ce92330b70d2e581d409", "status": "affected", "version": "d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3", "versionType": "git"}, {"lessThan": "7ae890ee19479eeeb87724cca8430b5cb3660c74", "status": "affected", "version": "1df42be305fe478ded1ee0c1d775f4ece713483b", "versionType": "git"}, {"lessThan": "aca06c617c83295f0caa486ad608fbef7bdc11e8", "status": "affected", "version": "c46cd6aaca81040deaea3500ba75126963294bd9", "versionType": "git"}, {"lessThan": "4c8002277167125078e6b9b90137bdf443ebaa08", "status": "affected", "version": "7e4196935069947d8b70b09c1660b67b067e75cb", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/fou_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5.10.227", "status": "affected", "version": "5.10.226", "versionType": "semver"}, {"lessThan": "5.15.168", "status": "affected", "version": "5.15.167", "versionType": "semver"}, {"lessThan": "6.1.111", "status": "affected", "version": "6.1.110", "versionType": "semver"}, {"lessThan": "6.6.52", "status": "affected", "version": "6.6.51", "versionType": "semver"}, {"lessThan": "6.10.11", "status": "affected", "version": "6.10.10", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "V1.1.1", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:5.10.226:*:*:*:*:*:*:*", "matchCriteriaId": "6FF3CC29-3CB0-439D-B47A-358D57871F06", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15.167:*:*:*:*:*:*:*", "matchCriteriaId": "B69DB824-7793-4911-A284-B06E7EFEDD7A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1.110:*:*:*:*:*:*:*", "matchCriteriaId": "BE9D244D-F8E0-4625-8EE0-5F654BC926C1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6.51:*:*:*:*:*:*:*", "matchCriteriaId": "C599A8CC-8612-442F-9C8A-A2AC38388756", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10.10:*:*:*:*:*:*:*", "matchCriteriaId": "7BDB319B-4374-489F-AF7A-CB5F0B71A038", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: fix initialization of grc\n\nThe grc must be initialize first. There can be a condition where if\nfou is NULL, goto out will be executed and grc would be used\nuninitialized."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fou: se corrige la inicializaci\u00f3n de grc. Primero se debe inicializar grc. Puede haber una condici\u00f3n en la que si fou es NULL, se ejecutar\u00e1 goto out y se utilizar\u00e1 grc sin inicializar."}], "id": "CVE-2024-46865", "lastModified": "2026-10-15T01:18:53.800", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-46865", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T13:42:07.132296Z", "version": "2.0.3"}}]}, "published": "2024-09-27T13:15:17.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16ff0895283058b0f96d4fe277aa25ee096f0ea8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c8002277167125078e6b9b90137bdf443ebaa08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d537b8d900514509622ce92330b70d2e581d409"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ae890ee19479eeeb87724cca8430b5cb3660c74"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aca06c617c83295f0caa486ad608fbef7bdc11e8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fou: fix initialization of grc", "id": "2315217", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2315217"}, "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-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfou: fix initialization of grc\nThe grc must be initialize first. There can be a condition where if\nfou is NULL, goto out will be executed and grc would be used\nuninitialized."], "name": "CVE-2024-46865", "package_state": [{"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": "2024-09-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46865\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46865\nhttps://lore.kernel.org/linux-cve-announce/2024092745-CVE-2024-46865-c6a7@gregkh/T"], "threat_severity": "Low"}

{}