{"id":"CVE-2026-72463","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb->dev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb->dev…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb->dev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb->dev…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 0f451b43c88bf2b9c038b414be580efee42e031b < 1acd93259b6be269e26be5d71c224bccd1f8352f","Linux >= 1c428b03840094410c5fb6a5db30640486bbbfcb < 63a30015199912bd5055bead8001b1ae68a67cdb","Linux >= 1c428b03840094410c5fb6a5db30640486bbbfcb < 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff","Linux 4236c30b437b80f673b9e08c8fae38b8d471ac9e","Linux 5002beda5cac69d522dc54da0d5d463ed9c963d2","Linux >= 6.18.23 < 6.18.54","Linux >= 6.12.94 < 6.13","Linux >= 6.19.13 < 6.20","Linux 7.0"],"published":"2026-08-15","updated":"2026-09-25","sourceUpdated":"2026-09-25T15:17:55.113","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72463","references":[{"url":"https://git.kernel.org/stable/c/1acd93259b6be269e26be5d71c224bccd1f8352f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00553,"epssPercentile":0.43846,"ingestedAt":"2026-09-25T15:10:56.362Z","slug":"CVE-2026-72463","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb->dev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking\ndevice reference, such as vti_rcv_cb. The subsequent async resumption\nwill decrement the tunnel device's reference count, which lead to uaf\nof tunnel dev and refcnt leak of orig dev as below:\n\nunregister_netdevice: waiting for vti1 to become free. Usage count = -2\n\nStash the original skb->dev to fix refcnt imbalance. The new skb->dev set\nby xfrm_rcv_cb can race with device teardown. Extend rcu protection over\nxfrm_rcv_cb and transport_finish to prevent races.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}