CVE-2026-64580
Description
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 ...
How to fix
- Linux Linux97e032e5733e49471fb73de117ea2ac1ac7c479a, df6856c2dda9187601d29b5fbd7a81b3b178cedf, 43de8a49335e611adb271bbd52e84dfbc11fc185, ff636d7b7cba6dea82ecf580415ea57f2c1a11b6, e078da1b4e11390cff3201c19a9a1fe70c5b934f, 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.3, 3.5, 3.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < 97e032e5733e49471fb73de117ea2ac1ac7c479a, 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < df6856c2dda9187601d29b5fbd7a81b3b178cedf, 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < 43de8a49335e611adb271bbd52e84dfbc11fc185, 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < ff636d7b7cba6dea82ecf580415ea57f2c1a11b6, 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < e078da1b4e11390cff3201c19a9a1fe70c5b934f, 84c4a9dfbf430861e7588d95ae3ff61535dca351 ≤ v < 136992de9bb91871084ae52d172610541c76e4d2, a7e22d0c0e81dde129a51ee413644124f4b59954, 01b0d887f67a388fb2a658ee2bdd74e5ba146818, a98124aac0b5adc5de8ae54f11322781cb4d85c3, e27b7bee743d921f037b1da6f071237345bef7c1, 3.0.79 ≤ v < 3.1, 3.2.46 ≤ v < 3.3, 3.4.46 ≤ v < 3.5, 3.9.3 ≤ v < 3.10, 3.10 | 97e032e5733e49471fb73de117ea2ac1ac7c479a, df6856c2dda9187601d29b5fbd7a81b3b178cedf, 43de8a49335e611adb271bbd52e84dfbc11fc185, ff636d7b7cba6dea82ecf580415ea57f2c1a11b6, e078da1b4e11390cff3201c19a9a1fe70c5b934f, 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.3, 3.5, 3.10 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.