{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26804","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.179Z","datePublished":"2024-04-04T08:20:31.305Z","dateUpdated":"2026-05-11T20:04:29.636Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T20:04:29.636Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_tunnel: prevent perpetual headroom growth\n\nsyzkaller triggered following kasan splat:\nBUG: KASAN: use-after-free in __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170\nRead of size 1 at addr ffff88812fb4000e by task syz-executor183/5191\n[..]\n kasan_report+0xda/0x110 mm/kasan/report.c:588\n __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170\n skb_flow_dissect_flow_keys include/linux/skbuff.h:1514 [inline]\n ___skb_get_hash net/core/flow_dissector.c:1791 [inline]\n __skb_get_hash+0xc7/0x540 net/core/flow_dissector.c:1856\n skb_get_hash include/linux/skbuff.h:1556 [inline]\n ip_tunnel_xmit+0x1855/0x33c0 net/ipv4/ip_tunnel.c:748\n ipip_tunnel_xmit+0x3cc/0x4e0 net/ipv4/ipip.c:308\n __netdev_start_xmit include/linux/netdevice.h:4940 [inline]\n netdev_start_xmit include/linux/netdevice.h:4954 [inline]\n xmit_one net/core/dev.c:3548 [inline]\n dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564\n __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4349\n dev_queue_xmit include/linux/netdevice.h:3134 [inline]\n neigh_connected_output+0x42c/0x5d0 net/core/neighbour.c:1592\n ...\n ip_finish_output2+0x833/0x2550 net/ipv4/ip_output.c:235\n ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323\n ..\n iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82\n ip_tunnel_xmit+0x1dbc/0x33c0 net/ipv4/ip_tunnel.c:831\n ipgre_xmit+0x4a1/0x980 net/ipv4/ip_gre.c:665\n __netdev_start_xmit include/linux/netdevice.h:4940 [inline]\n netdev_start_xmit include/linux/netdevice.h:4954 [inline]\n xmit_one net/core/dev.c:3548 [inline]\n dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564\n ...\n\nThe splat occurs because skb->data points past skb->head allocated area.\nThis is because neigh layer does:\n  __skb_pull(skb, skb_network_offset(skb));\n\n... but skb_network_offset() returns a negative offset and __skb_pull()\narg is unsigned.  IOW, we skb->data gets \"adjusted\" by a huge value.\n\nThe negative value is returned because skb->head and skb->data distance is\nmore than 64k and skb->network_header (u16) has wrapped around.\n\nThe bug is in the ip_tunnel infrastructure, which can cause\ndev->needed_headroom to increment ad infinitum.\n\nThe syzkaller reproducer consists of packets getting routed via a gre\ntunnel, and route of gre encapsulated packets pointing at another (ipip)\ntunnel.  The ipip encapsulation finds gre0 as next output device.\n\nThis results in the following pattern:\n\n1). First packet is to be sent out via gre0.\nRoute lookup found an output device, ipip0.\n\n2).\nip_tunnel_xmit for gre0 bumps gre0->needed_headroom based on the future\noutput device, rt.dev->needed_headroom (ipip0).\n\n3).\nip output / start_xmit moves skb on to ipip0. which runs the same\ncode path again (xmit recursion).\n\n4).\nRouting step for the post-gre0-encap packet finds gre0 as output device\nto use for ipip0 encapsulated packet.\n\ntunl0->needed_headroom is then incremented based on the (already bumped)\ngre0 device headroom.\n\nThis repeats for every future packet:\n\ngre0->needed_headroom gets inflated because previous packets' ipip0 step\nincremented rt->dev (gre0) headroom, and ipip0 incremented because gre0\nneeded_headroom was increased.\n\nFor each subsequent packet, gre/ipip0->needed_headroom grows until\npost-expand-head reallocations result in a skb->head/data distance of\nmore than 64k.\n\nOnce that happens, skb->network_header (u16) wraps around when\npskb_expand_head tries to make sure that skb_network_offset() is unchanged\nafter the headroom expansion/reallocation.\n\nAfter this skb_network_offset(skb) returns a different (and negative)\nresult post headroom expansion.\n\nThe next trip to neigh layer (or anything else that would __skb_pull the\nnetwork header) makes skb->data point to a memory location outside\nskb->head area.\n\nv2: Cap the needed_headroom update to an arbitarily chosen upperlimit to\nprevent perpetual increase instead of dropping the headroom increment\ncompletely."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ip_tunnel.c"],"versions":[{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"f81e94d2dcd2397137edcb8b85f4c5bed5d22383","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"2e95350fe9db9d53c701075060ac8ac883b68aee","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"afec0c5cd2ed71ca95a8b36a5e6d03333bf34282","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"ab63de24ebea36fe73ac7121738595d704b66d96","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"049d7989c67e8dd50f07a2096dbafdb41331fb9b","status":"affected","versionType":"git"},{"version":"243aad830e8a4cdda261626fbaeddde16b08d04a","lessThan":"5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f","status":"affected","versionType":"git"},{"version":"03017375b0122453e6dda833ff7bd4191915def5","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ip_tunnel.c"],"versions":[{"version":"2.6.34","status":"affected"},{"version":"0","lessThan":"2.6.34","status":"unaffected","versionType":"semver"},{"version":"5.4.271","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.212","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.151","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.81","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.21","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.9","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.4.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.10.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.15.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.1.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.6.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.7.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f81e94d2dcd2397137edcb8b85f4c5bed5d22383"},{"url":"https://git.kernel.org/stable/c/2e95350fe9db9d53c701075060ac8ac883b68aee"},{"url":"https://git.kernel.org/stable/c/afec0c5cd2ed71ca95a8b36a5e6d03333bf34282"},{"url":"https://git.kernel.org/stable/c/ab63de24ebea36fe73ac7121738595d704b66d96"},{"url":"https://git.kernel.org/stable/c/a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9"},{"url":"https://git.kernel.org/stable/c/049d7989c67e8dd50f07a2096dbafdb41331fb9b"},{"url":"https://git.kernel.org/stable/c/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f"}],"title":"net: ip_tunnel: prevent perpetual headroom growth","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-416","lang":"en","description":"CWE-416 Use After Free"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-11-12T16:26:17.359512Z","id":"CVE-2024-26804","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":"2024-11-12T16:40:15.613Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T00:14:13.557Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/f81e94d2dcd2397137edcb8b85f4c5bed5d22383","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/2e95350fe9db9d53c701075060ac8ac883b68aee","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/afec0c5cd2ed71ca95a8b36a5e6d03333bf34282","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ab63de24ebea36fe73ac7121738595d704b66d96","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/049d7989c67e8dd50f07a2096dbafdb41331fb9b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","tags":["x_transferred"]}]}]},"dataVersion":"5.2"}