{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90083", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.785Z", "datePublished": "2026-09-17T16:06:00.185Z", "dateUpdated": "2026-10-21T12:49:42.659Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:49:42.659Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ife: Only operate on Ethernet frames\n\nact_ife encapsulates/decapsulates the original Ethernet header and uses\nskb->dev->hard_header_len as the length of that header. That is only\ncorrect for Ethernet devices: on a device where hard_header_len does not\nmatch the L2 header that was actually pulled (PPP reports PPP_HDRLEN\nwhile nothing is stripped on ingress), the ingress skb_push()/skb_pull()\nuse the wrong length and can hit skb_under_panic when headroom is tight.\n\nIFE is Ethernet-only by design - it builds an outer ethhdr, rewrites\nh_source/h_dest/h_proto, and calls eth_type_trans() on decode - so\ninstead of trying to make the offsets work for arbitrary link types,\nsimply drop packets that do not carry an Ethernet header.\n\nChecking skb->dev->type alone is not enough. We have to cater for a\ncorner case where mirred can redirect an skb from a non-Ethernet device\nto an Ethernet one, and skb->dev then says nothing about the framing the\nskb actually has: an skb redirected from ppp0 reaches the target's ingress\nhook with mac_len 0 and no Ethernet header at all. So at ingress also\nrequire mac_len to be ETH_HLEN. On egress mac_len is not maintained, so\nthe device type is all we have; a bogus redirect there yields a malformed\nframe rather than an out-of-bounds push, and it would be malformed with or\nwithout IFE.\n\nThat corner case is not theoretical - redirecting from ppp0 into a veth\nthat has an ife encode action on its ingress hook panics without this\npatch:\n\n skbuff: skb_under_panic: len:98 put:14 head:ffff88800e410000\n data:ffff88800e40fff5 tail:0x57 end:0x640 dev:veth3\n kernel BUG at net/core/skbuff.c:214!\n Call Trace:\n skb_push (net/core/skbuff.c:224 net/core/skbuff.c:2657)\n tcf_ife_act (net/sched/act_ife.c:829 net/sched/act_ife.c:874)\n tc_run (net/core/dev.c:4463)\n netif_receive_skb (net/core/dev.c:6463 net/core/dev.c:6522)\n tcf_mirred_to_dev (net/sched/act_mirred.c:248 net/sched/act_mirred.c:328)\n tcf_mirred_act (net/sched/act_mirred.c:489)\n tc_run (net/core/dev.c:4463)\n process_backlog (net/core/dev.c:6728)\n\nWith Ethernet framing guaranteed, use ETH_HLEN instead of\nhard_header_len." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ife/ife.c", "net/sched/act_ife.c" ], "versions": [ { "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "lessThan": "b951dd2fd5ede007474fc134ecb5639e1f86f5de", "status": "affected", "versionType": "git" }, { "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "lessThan": "13dddf87a1f89557920f9b437a21ea0b7225f828", "status": "affected", "versionType": "git" }, { "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "lessThan": "d218ea7df6eba076171f2d4897a429a31f2139f0", "status": "affected", "versionType": "git" }, { "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "lessThan": "138b0054021fd7d57bc3eb68b3f4e2bcec037849", "status": "affected", "versionType": "git" }, { "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "lessThan": "5b483f7791b079bb97d411f1066652ff659207ff", "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/ife/ife.c", "net/sched/act_ife.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.11", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b951dd2fd5ede007474fc134ecb5639e1f86f5de" }, { "url": "https://git.kernel.org/stable/c/13dddf87a1f89557920f9b437a21ea0b7225f828" }, { "url": "https://git.kernel.org/stable/c/d218ea7df6eba076171f2d4897a429a31f2139f0" }, { "url": "https://git.kernel.org/stable/c/138b0054021fd7d57bc3eb68b3f4e2bcec037849" }, { "url": "https://git.kernel.org/stable/c/5b483f7791b079bb97d411f1066652ff659207ff" } ], "title": "net/sched: act_ife: Only operate on Ethernet frames", "x_generator": { "engine": "bippy-1.2.0" } } } }