High 7.8Published Aug 5, 2026

CVE-2026-64580xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()

Updated under an hour ago (Oct 26, 2026, 1:30 PM ET)

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Exploited in the last 30 days

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): CWE-415
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 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

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

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.