{"id":"CVE-2024-44940","state":"PUBLISHED","title":"fou: remove warn in gue_gro_receive on unsupported protocol","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: remove warn in gue_gro_receive on unsupported protocol\n\nDrop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is\nnot known or does not have a GRO handler.\n\nSuch a packet is easily constructed. Syzbot generates them and sets\noff this warning.\n\nRemove the warning as it is expected and not actionable.\n\nThe warning was previously reduced from WARN_ON to WARN_ON_ONCE in\ncommit 270136613bf7 (\"fou: Do WARN_ON_ONCE in gue_gro_receive for bad\nproto callbacks\").","publishedAt":"2024-08-26T11:20:44.914Z","updatedAt":"2026-08-05T11:37:09.480Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"a925a200299a6dfc7c172f54da6f374edc930053","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"b1453a5616c7bd8acd90633ceba4e59105ba3b51","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"5a2e37bc648a2503bf6d687aed27b9f4455d82eb","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"3db4395332e7050ef9ddeb3052e6b5019f2a2a59","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"440ab7f97261bc28501636a13998e1b1946d2e79","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"dd89a81d850fa9a65f67b4527c0e420d15bf836c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/fou_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.174","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.107","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.47","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.6","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/fou_core.c"]}],"references":["https://git.kernel.org/stable/c/a925a200299a6dfc7c172f54da6f374edc930053","https://git.kernel.org/stable/c/b1453a5616c7bd8acd90633ceba4e59105ba3b51","https://git.kernel.org/stable/c/5a2e37bc648a2503bf6d687aed27b9f4455d82eb","https://git.kernel.org/stable/c/3db4395332e7050ef9ddeb3052e6b5019f2a2a59","https://git.kernel.org/stable/c/440ab7f97261bc28501636a13998e1b1946d2e79","https://git.kernel.org/stable/c/dd89a81d850fa9a65f67b4527c0e420d15bf836c","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:47.831Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/44xxx/CVE-2024-44940.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-44940","state":"PUBLISHED","datePublished":"2024-08-26T11:20:44.914Z","dateUpdated":"2026-08-05T11:37:09.480Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-08-21T05:34:56.664Z"},"containers":{"cna":{"title":"fou: remove warn in gue_gro_receive on unsupported protocol","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: remove warn in gue_gro_receive on unsupported protocol\n\nDrop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is\nnot known or does not have a GRO handler.\n\nSuch a packet is easily constructed. Syzbot generates them and sets\noff this warning.\n\nRemove the warning as it is expected and not actionable.\n\nThe warning was previously reduced from WARN_ON to WARN_ON_ONCE in\ncommit 270136613bf7 (\"fou: Do WARN_ON_ONCE in gue_gro_receive for bad\nproto callbacks\")."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"a925a200299a6dfc7c172f54da6f374edc930053","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"b1453a5616c7bd8acd90633ceba4e59105ba3b51","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"5a2e37bc648a2503bf6d687aed27b9f4455d82eb","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"3db4395332e7050ef9ddeb3052e6b5019f2a2a59","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"440ab7f97261bc28501636a13998e1b1946d2e79","versionType":"git"},{"version":"37dd0247797b168ad1cc7f5dbec825a1ee66535b","status":"affected","lessThan":"dd89a81d850fa9a65f67b4527c0e420d15bf836c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/fou_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.174","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.107","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.47","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.6","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/fou_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a925a200299a6dfc7c172f54da6f374edc930053"},{"url":"https://git.kernel.org/stable/c/b1453a5616c7bd8acd90633ceba4e59105ba3b51"},{"url":"https://git.kernel.org/stable/c/5a2e37bc648a2503bf6d687aed27b9f4455d82eb"},{"url":"https://git.kernel.org/stable/c/3db4395332e7050ef9ddeb3052e6b5019f2a2a59"},{"url":"https://git.kernel.org/stable/c/440ab7f97261bc28501636a13998e1b1946d2e79"},{"url":"https://git.kernel.org/stable/c/dd89a81d850fa9a65f67b4527c0e420d15bf836c"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The warning is reached from the NAPI GRO receive path (`udp4_gro_receive` → `gue_gro_receive`) while parsing a UDP datagram arriving from the wire on a host with a FOU/GUE tunnel port, so any remote host that can send a UDP packet to that port triggers it.\nAC:L - The trigger is a single stateless, unsolicited UDP packet whose GUE header carries any `proto_ctype` lacking a registered offload handler; the commit itself notes \"such a packet is easily constructed\" and syzbot generates them, with no race, memory-layout, or timing condition involved.\nPR:N - The GRO path processes the packet before any authentication, authorization, or socket-level filtering — the FOU receive socket is unconnected, so an unauthenticated off-path attacker needs no credentials on the target.\nUI:N - Processing happens automatically in softirq context when the packet is received; no action by any local user or administrator is required.\nS:U - The warning and any resulting panic occur in the kernel of the receiving host, entirely within the same security authority, with no crossing of a VM, container, or IOMMU boundary.\nC:N - Control flow after the WARN is identical to the fixed code (`goto out`); no memory is read out of bounds and nothing is disclosed to the attacker, who cannot observe the kernel log.\nI:N - The bug involves no memory corruption or state modification — the packet is dropped from GRO either way, so no attacker-controlled data is written anywhere.\nA:H - The attacker-triggerable WARN_ON_ONCE becomes an immediate kernel panic on systems configured with `panic_on_warn=1` or a `warn_limit`, a common hardening/crash-dump setting in production, cloud, and Android fleets, allowing a single remote packet to take down the host."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T11:37:09.480Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.10.234"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.15.174"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.1.107"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.6.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.10.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.11"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-44940","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:27:32.251724Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-12T17:33:06.539Z"}},{"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":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T22:13:45.636Z"}}]}}}