{"id":"CVE-2026-98364","title":"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 de…","summary":"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 de…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 25ee3286dcbc830a833354bb1d15567956844813 < 8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807","Linux >= 25ee3286dcbc830a833354bb1d15567956844813 < 9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1","Linux 2.6.25"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:10.717","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98364","references":[{"url":"https://git.kernel.org/stable/c/8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00121,"epssPercentile":0.01866,"ingestedAt":"2026-10-06T08:50:17.390Z","slug":"CVE-2026-98364","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":217349,"id":"CVE-2026-98364","ts":1791361317261,"field":"cvss","old":null,"new":"7.8"},{"seq":217348,"id":"CVE-2026-98364","ts":1791361317261,"field":"severity","old":"none","new":"high"}]}