330 lines
17 KiB
JSON
330 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47515",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-24T15:02:54.824Z",
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"datePublished": "2024-05-24T15:09:29.334Z",
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"dateUpdated": "2026-08-05T08:48:12.387Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:12.387Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix the iif in the IPv6 socket control block\n\nWhen an IPv4 packet is received, the ip_rcv_core(...) sets the receiving\ninterface index into the IPv4 socket control block (v5.16-rc4,\nnet/ipv4/ip_input.c line 510):\n\n IPCB(skb)->iif = skb->skb_iif;\n\nIf that IPv4 packet is meant to be encapsulated in an outer IPv6+SRH\nheader, the seg6_do_srh_encap(...) performs the required encapsulation.\nIn this case, the seg6_do_srh_encap function clears the IPv6 socket control\nblock (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163):\n\n memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));\n\nThe memset(...) was introduced in commit ef489749aae5 (\"ipv6: sr: clear\nIP6CB(skb) on SRH ip4ip6 encapsulation\") a long time ago (2019-01-29).\n\nSince the IPv6 socket control block and the IPv4 socket control block share\nthe same memory area (skb->cb), the receiving interface index info is lost\n(IP6CB(skb)->iif is set to zero).\n\nAs a side effect, that condition triggers a NULL pointer dereference if\ncommit 0857d6f8c759 (\"ipv6: When forwarding count rx stats on the orig\nnetdev\") is applied.\n\nTo fix that issue, we set the IP6CB(skb)->iif with the index of the\nreceiving interface once again."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - On an SRv6 PE/router with ip4ip6 encap routes, a remote IPv4 packet is received, encapsulated in seg6_do_srh_encap(), then forwarded via ip6_forward(), so the crash is reachable over the network without local access.\nAC:L - Once SRv6 encap for IPv4 is configured (the intended deployment for this code), any matching IPv4 packet reliably clears IP6CB(skb)->iif and hits the NULL dereference; no race or attacker-uncontrollable memory layout is required.\nPR:N - Triggering requires only sending unauthenticated IPv4 packets that match an already-configured SRv6 encap route; the attacker needs no account or capability on the target.\nUI:N - Packet processing runs entirely in the kernel receive/forward path with no victim user action beyond the router already having SRv6 encap configured.\nS:U - The NULL dereference oopses the same host kernel that performs forwarding and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a pure NULL pointer dereference of idev in ip6_forward() after iif is cleared to zero, with no OOB read, UAF, or other information-disclosure primitive.\nI:N - The fault is a straight NULL dereference of idev->cnf.disable_policy with no write primitive, type confusion, or memory corruption that could alter kernel state or hijack control flow.\nA:H - Dereferencing the NULL inet6_dev pointer in ip6_forward() causes a kernel oops/panic and can be re-triggered at will by remote packets, taking down the system."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/seg6_iptunnel.c"
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],
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"versions": [
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{
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"version": "c630ec8bdadae9d557b1ceb9d6c06e149108a0d4",
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"lessThan": "b16d412e5f79734033df04e97d7ea2f50a8e9fe3",
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"status": "affected",
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"versionType": "git"
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},
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"version": "2f704348c93ff8119e642dae6a72327f90b82810",
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"lessThan": "6431e71093f3da586a00c6d931481ffb0dc2db0e",
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"status": "affected",
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{
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"version": "4.14.98",
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"lessThan": "4.14.258",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.19.20",
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"lessThan": "4.19.221",
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"version": "4.20.7",
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"net/ipv6/seg6_iptunnel.c"
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],
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"version": "5.0",
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"version": "0",
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{
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"version": "4.14.258",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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},
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{
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"version": "4.19.221",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.165",
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{
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"version": "5.15.8",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "5.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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}
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"role": "CISA Coordinator",
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