CVE-2026-64580xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for <dev> to become free"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 84c4a9dfbf430861e7588d95ae3ff61535dca351 before 97e032e5733e49471fb73de117ea2ac1ac7c479a; from 84c4a9dfbf430861e7588d95ae3ff61535dca351 before df6856c2dda9187601d29b5fbd7a81b3b178cedf; 84c4a9dfbf430861e7588d95ae3ff61535dca351 builds before 43de8a49335e611adb271bbd52e84dfbc11fc185; from 84c4a9dfbf430861e7588d95ae3ff61535dca351 before ff636d7b7cba6dea82ecf580415ea57f2c1a11b6; from 84c4a9dfbf430861e7588d95ae3ff61535dca351 before e078da1b4e11390cff3201c19a9a1fe70c5b934f; from 84c4a9dfbf430861e7588d95ae3ff61535dca351 before 136992de9bb91871084ae52d172610541c76e4d2; a7e22d0c0e81dde129a51ee413644124f4b59954; 01b0d887f67a388fb2a658ee2bdd74e5ba146818; and 6 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a
- https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf
- https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185
- https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6
- https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f
- https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.