{"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": "2026-09-17T16:06:00.185Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-17T16:06:00.185Z"}, "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": "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": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.18.52"}, {"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-rc1"}]}]}], "references": [{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ife/ife.c", "net/sched/act_ife.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d218ea7df6eba076171f2d4897a429a31f2139f0", "status": "affected", "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "versionType": "git"}, {"lessThan": "138b0054021fd7d57bc3eb68b3f4e2bcec037849", "status": "affected", "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "versionType": "git"}, {"lessThan": "5b483f7791b079bb97d411f1066652ff659207ff", "status": "affected", "version": "295a6e06d21e1f469c9f38b00125a13b60ad4e7c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ife/ife.c", "net/sched/act_ife.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.11"}, {"lessThan": "4.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-90083", "lastModified": "2026-09-17T17:16:57.707", "metrics": {}, "published": "2026-09-17T17:16:57.707", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/138b0054021fd7d57bc3eb68b3f4e2bcec037849"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5b483f7791b079bb97d411f1066652ff659207ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d218ea7df6eba076171f2d4897a429a31f2139f0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}