310 lines
16 KiB
JSON
310 lines
16 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-2026-68338",
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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": "2026-07-30T09:28:09.384Z",
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"datePublished": "2026-08-10T12:03:14.549Z",
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"dateUpdated": "2026-10-19T21:09:05.428Z"
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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": "2026-08-19T16:33:38.308Z"
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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\nnet/packet: avoid fanout hook re-registration after unregister\n\npacket_set_ring() temporarily detaches a socket from packet delivery while\nreconfiguring its ring. It records the previous running state, clears\npo->num, unregisters the protocol hook when needed, drops po->bind_lock,\nand later restores po->num and re-registers the hook from the saved\nwas_running value.\n\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\nobserve the socket as not running, skip __unregister_prot_hook(), and\ninvalidate the per-socket binding by setting po->ifindex to -1 and clearing\npo->prot_hook.dev. A one-member fanout group can still retain its shared\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\nsolely from the stale was_running state can re-add the fanout hook after\nthe device has been unregistered.\n\nTreat po->ifindex == -1 as an invalidated binding after reacquiring\npo->bind_lock. This is distinct from ifindex 0, the normal\nunbound/wildcard state: ifindex -1 marks an existing device binding that\nwas invalidated when the device was unregistered. Restore po->num as\nbefore, but do not re-register the hook if device unregister already\ndetached the socket."
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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 - The bug is triggered through local syscalls — creating an AF_PACKET socket, PACKET_FANOUT/bind setsockopt, PACKET_RX_RING setsockopt, and a netlink device unregister — with no remote packet processing involved.\nAC:L - The attacker controls both sides of the race: it issues the packet_set_ring() reconfiguration and deletes the bound netdev in its own netns, and the unlocked window spans synchronize_net() plus the ring swap, making it wide and reliably winnable.\nPR:L - AF_PACKET requires CAP_NET_RAW and device unregistration CAP_NET_ADMIN, but an unprivileged user obtains both via user+network namespaces (unshare -Urn) and can create and delete veth/dummy devices there.\nUI:N - The attacker performs every step itself — socket setup, ring reconfiguration and device teardown — with no action required from any other user.\nS:U - The stale hook registration and resulting corruption stay within the kernel's own security authority; no hypervisor, IOMMU or other trust boundary is crossed.\nC:H - The fanout packet_type is left linked into a net_device that is being torn down, a dangling registration on soon-to-be-freed memory; such stale-pointer state in the ptype lists can be leveraged for kernel memory disclosure.\nI:H - The dangling list node in the freed net_device's ptype list yields a list_del write into freed memory when the hook is later removed, a controllable write primitive typical of use-after-free exploitation.\nA:H - The re-added hook makes netdev_run_todo() hit BUG_ON(!list_empty(&dev->ptype_all)) while RTNL is held, oopsing the kernel and permanently wedging all further network configuration — a repeatable, unprivileged host-wide denial of service."
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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/packet/af_packet.c"
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],
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"versions": [
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "acb40ebfa5c4d62f84339fcbf713f2a9fd033a71",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "c820f4b7f2fa38f8769db0d0cefdd94e2721504d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "4628efbdc7affd094181f5263e65c1062e31f15f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "80ec024d53a05c60ad1d08968dcf745f10c1665c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "0a052e0808e015e68144a9877e6ef42b952c49fa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "1bc55c29cd85818e9052f17deb287d5a11fb817f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "a885387dae7986a55bae5c77a15bdd447f64e9b9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc",
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"lessThan": "50aff80475abd3533eef4320477037e6fcc6b56e",
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"status": "affected",
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"versionType": "git"
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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/packet/af_packet.c"
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],
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"versions": [
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{
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"version": "3.1",
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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": "3.1",
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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": "5.10.265",
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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": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.183",
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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": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.1",
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"versionEndExcluding": "5.10.265"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.1",
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"versionEndExcluding": "6.12.101"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.1",
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"versionEndExcluding": "7.1.6"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/acb40ebfa5c4d62f84339fcbf713f2a9fd033a71"
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},
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{
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"url": "https://git.kernel.org/stable/c/c820f4b7f2fa38f8769db0d0cefdd94e2721504d"
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},
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{
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"url": "https://git.kernel.org/stable/c/4628efbdc7affd094181f5263e65c1062e31f15f"
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},
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{
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"url": "https://git.kernel.org/stable/c/80ec024d53a05c60ad1d08968dcf745f10c1665c"
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},
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{
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"url": "https://git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa"
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},
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{
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"url": "https://git.kernel.org/stable/c/1bc55c29cd85818e9052f17deb287d5a11fb817f"
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},
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{
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"url": "https://git.kernel.org/stable/c/a885387dae7986a55bae5c77a15bdd447f64e9b9"
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},
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{
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"url": "https://git.kernel.org/stable/c/50aff80475abd3533eef4320477037e6fcc6b56e"
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}
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],
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"title": "net/packet: avoid fanout hook re-registration after unregister",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-68338",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:47:16.591778Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T21:09:05.428Z"
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}
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}
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]
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}
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} |