CVE-2026-64580

CVE CVE-2026-64580EUVD EUVD-2026-53274Published 2026-08-05T08:09:34.000ZLast changed 2026-08-08T15:13:17.000ZCVSS 7.8

What the advisory describes

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 ...

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 84c4a9dfbf430861e7588d95ae3ff61535dca351 <43de8a49335e611adb271bbd52e84dfbc11fc185; 3.10; patch: 7.2-rc4; 3.4.46 <3.5; 84c4a9dfbf430861e7588d95ae3ff61535dca351 <df6856c2dda9187601d29b5fbd7a81b3b178cedf; 84c4a9dfbf430861e7588d95ae3ff61535dca351 <136992de9bb91871084ae52d172610541c76e4d2; 3.9.3 <3.10; patch: 6.18.42; patch: 6.6.148; 84c4a9dfbf430861e7588d95ae3ff61535dca351 <e078da1b4e11390cff3201c19a9a1fe70c5b934f; 84c4a9dfbf430861e7588d95ae3ff61535dca351 <ff636d7b7cba6dea82ecf580415ea57f2c1a11b6; e27b7bee743d921f037b1da6f071237345bef7c1; 3.2.46 <3.3; patch: 6.12.101; a98124aac0b5adc5de8ae54f11322781cb4d85c3; 3.0.79 <3.1; patch: 0; patch: 7.1.6; 01b0d887f67a388fb2a658ee2bdd74e5ba146818; a7e22d0c0e81dde129a51ee413644124f4b59954

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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