138 lines
8.1 KiB
JSON
138 lines
8.1 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-2026-98364",
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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": "2026-09-25T10:25:14.344Z",
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"datePublished": "2026-10-06T08:46:50.051Z",
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"dateUpdated": "2026-10-19T09:18:16.366Z"
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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": "2026-10-19T09:18:16.366Z"
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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\nxfrm: hold net_device reference under RCU in bundle creation\n\nxfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into\na local pointer without taking a device reference, then pass it to\nxfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via\ndst_dev_put() and frees the old net_device, causing a use-after-free\nwhen xfrm6_fill_dst() later dereferences the stale dev pointer.\n\n BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860\n (net/ipv6/xfrm6_policy.c:86 netdev_hold())\n Read of size 8 at addr ffff8880142fe588 by task exploit/153\n Call Trace:\n xfrm6_fill_dst+0x82c/0x860\n xfrm_resolve_and_create_bundle+0x21d4/0x2bd0\n xfrm_lookup_with_ifid+0x485/0x1640\n ip6_dst_lookup_flow+0x19b/0x1e0\n udpv6_sendmsg+0x1443/0x2dd0\n\nFix this by reading dst->dev via dst_dev_rcu() and keeping the RCU\nread-side critical section active until xfrm_fill_dst() has taken the\nrequired device references."
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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 - Both sides of the race are local syscalls: sendmsg() (udpv6_sendmsg->ip6_dst_lookup_flow->xfrm_lookup_with_ifid->xfrm_bundle_create) and an RTM_DELLINK rtnetlink request that frees the net_device. A remote peer cannot delete the link, so the network cannot cause the freed state.\nAC:L - The attacker controls both sides of the race: they repeatedly send through an xfrm-policy-matched route while deleting the link in a loop. The window between reading dst->dev and netdev_hold() in xfrm_fill_dst() is short, but the attacker can retry as often as needed.\nPR:L - xfrm_user_rcv_msg only checks netlink_net_capable(CAP_NET_ADMIN), and RTM_DELLINK is also checked per namespace. An unprivileged user with unshare -Urn can create a device, install the XFRM policy and state, and delete the device inside their own network namespace.\nUI:N - No victim action is needed: the attacker sets up the namespace, the xfrm configuration, the sending socket and the link deletion entirely on their own.\nS:U - The use-after-free is inside the kernel's own networking code and the impact stays within the kernel's security authority; no VM or IOMMU boundary is crossed.\nC:H - xfrm6_fill_dst() reads dev->ip6_ptr from the freed net_device through in6_dev_get() and stores the stale dev in a new dst. A reclaimed object controls those values, which can be used to disclose kernel memory.\nI:H - netdev_hold() increments a refcount inside the freed net_device, and in6_dev_get() increments a refcount on a pointer taken from the reclaimed object. Both are writes into attacker-reclaimable slab memory, usable to corrupt kernel data and hijack control flow.\nA:H - KASAN reports a slab-use-after-free in xfrm6_fill_dst(). On production kernels the stale dev stays attached to the new xfrm dst and is dereferenced later, which leads to an oops or panic."
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "25ee3286dcbc830a833354bb1d15567956844813",
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"lessThan": "8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807",
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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": "25ee3286dcbc830a833354bb1d15567956844813",
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"lessThan": "9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1",
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "2.6.25",
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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": "2.6.25",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "2.6.25",
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"versionEndExcluding": "7.2.8"
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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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"versionStartIncluding": "2.6.25",
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"versionEndExcluding": "7.3"
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}
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]
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}
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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/8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807"
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},
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{
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"url": "https://git.kernel.org/stable/c/9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1"
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}
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],
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"title": "xfrm: hold net_device reference under RCU in bundle creation",
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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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}
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} |