264 lines
15 KiB
JSON
264 lines
15 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-2023-53559",
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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": "2025-10-04T15:14:15.923Z",
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"datePublished": "2025-10-04T15:17:03.497Z",
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"dateUpdated": "2026-08-05T09:14:50.051Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:14:50.051Z"
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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\nip_vti: fix potential slab-use-after-free in decode_session6\n\nWhen ip_vti device is set to the qdisc of the sfb type, the cb field\nof the sent skb may be modified during enqueuing. Then,\nslab-use-after-free may occur when ip_vti device sends IPv6 packets.\nAs commit f855691975bb (\"xfrm6: Fix the nexthdr offset in\n_decode_session6.\") showed, xfrm_decode_session was originally intended\nonly for the receive path. IP6CB(skb)->nhoff is not set during\ntransmission. Therefore, set the cb field in the skb to 0 before\nsending packets."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - Triggering requires a locally configured ip_vti device with an sfb qdisc attached and packets routed out of it, all of which is set up and driven through local netlink/rtnetlink and a local socket. Although forwarded traffic from a remote peer would also hit vti_tunnel_xmit on a router so configured, the vulnerable state depends entirely on local device/qdisc configuration, so Local is the defensible vector.\nAC:L - The attacker creates every precondition: the vti device, the sfb qdisc, and its rehash_interval/warmup_time tunables that control when q->slot flips and hashes[1] is populated with a siphash value overlapping IP6CB->nhoff. Once slot==1 every transmitted IPv6 packet performs the wild nh[nhoff] read, making the trigger deterministic and repeatable.\nPR:L - Creating the vti tunnel and attaching the sfb qdisc requires CAP_NET_ADMIN, but ip_vti is fully network-namespace aware (register_pernet_device with a per-netns ip_vti0 fallback), so an unprivileged user obtains the needed capability with unshare -Urn. Per kernel scoring guidance, CAP_NET_ADMIN reachable through user namespaces is Low, not High.\nUI:N - The attacker performs the entire sequence — configure the device and qdisc, add a route, send an IPv6 packet — with no action by any other user or administrator.\nS:U - The out-of-bounds access occurs in kernel heap memory and its consequences remain within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - decode_session6() reads a byte from freed or adjacent slab memory at an offset up to 64KB beyond the network header — an unbounded use-after-free read rather than a small bounded one — and that value steers the protocol state machine and xfrm flow key, providing an oracle on kernel heap contents.\nI:H - The kernel's IPsec flow decode (flowi6_proto, ports, and the ensuing ip6_route_output/xfrm_lookup_route policy selection) is driven by data read out of freed heap memory, so a security-relevant kernel decision is made on corrupted state; consistent with treating slab-use-after-free as a high integrity impact.\nA:H - The wild read dereferences an address up to 65535 bytes past the skb data allocation, which faults on unmapped memory or memory holes and reliably produces a KASAN slab-use-after-free splat and kernel oops. The attacker can repeat it on every transmitted packet, so it is a sustained crash/DoS."
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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/ipv4/ip_vti.c"
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],
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"versions": [
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{
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"version": "f855691975bb06373a98711e4cfe2c224244b536",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/ipv4/ip_vti.c"
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],
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{
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"version": "3.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.14.324",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.293",
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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": "5.4.255",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.192",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.128",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.47",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.4.12",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5",
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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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}
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"cpeApplicability": [
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{
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"url": "https://git.kernel.org/stable/c/d34c30442d5e53a33cde79ca163320dbe2432cbd"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b4d69539fdea138af2befe08893850c89248068"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1e04cc2ef2c0c0866c19f5627149a76c2baae32"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b05bf5dc437f7891dd409a3eaf5058459391c7a"
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{
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"url": "https://git.kernel.org/stable/c/78e397a43e1c47321a4679cc49a6c4530bf820b9"
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},
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{
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"url": "https://git.kernel.org/stable/c/6018a266279b1a75143c7c0804dd08a5fc4c3e0b"
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}
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],
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"title": "ip_vti: fix potential slab-use-after-free in decode_session6",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |