{"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"}]}]}}