{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46865", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.294Z", "datePublished": "2024-09-27T12:42:53.691Z", "dateUpdated": "2026-08-05T11:39:07.502Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:07.502Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is the GUE/FOU GRO receive handler, reached purely from an inbound UDP datagram addressed to the configured FOU port via napi_gro_receive → inet_gro_receive → udp4_gro_receive → gue_gro_receive. 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 — a remote unauthenticated kernel crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/fou_core.c" ], "versions": [ { "version": "231c235d2f7a66f018f172e26ffd47c363f244ef", "lessThan": "392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e", "status": "affected", "versionType": "git" }, { "version": "4494bccb52ffda22ce5a1163a776d970e6229e08", "lessThan": "16ff0895283058b0f96d4fe277aa25ee096f0ea8", "status": "affected", "versionType": "git" }, { "version": "d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3", "lessThan": "5d537b8d900514509622ce92330b70d2e581d409", "status": "affected", "versionType": "git" }, { "version": "1df42be305fe478ded1ee0c1d775f4ece713483b", "lessThan": "7ae890ee19479eeeb87724cca8430b5cb3660c74", "status": "affected", "versionType": "git" }, { "version": "c46cd6aaca81040deaea3500ba75126963294bd9", "lessThan": "aca06c617c83295f0caa486ad608fbef7bdc11e8", "status": "affected", "versionType": "git" }, { "version": "7e4196935069947d8b70b09c1660b67b067e75cb", "lessThan": "4c8002277167125078e6b9b90137bdf443ebaa08", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/fou_core.c" ], "versions": [ { "version": "5.10.226", "lessThan": "5.10.227", "status": "affected", "versionType": "semver" }, { "version": "5.15.167", "lessThan": "5.15.168", "status": "affected", "versionType": "semver" }, { "version": "6.1.110", "lessThan": "6.1.111", "status": "affected", "versionType": "semver" }, { "version": "6.6.51", "lessThan": "6.6.52", "status": "affected", "versionType": "semver" }, { "version": "6.10.10", "lessThan": "6.10.11", "status": "affected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.226", "versionEndExcluding": "5.10.227" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.167", "versionEndExcluding": "5.15.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.110", "versionEndExcluding": "6.1.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.51", "versionEndExcluding": "6.6.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10.10", "versionEndExcluding": "6.10.11" } ] } ] } ], "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" } ], "title": "fou: fix initialization of grc", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T13:42:07.132296Z", "id": "CVE-2024-46865", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T13:43:27.114Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:19:47.627Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:58:02.422Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" } ] } ] } }