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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64580

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

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Status
Published
Published
Updated
Assigning organization
Linux

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 ...

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < 97e032e5733e49471fb73de117ea2ac1ac7c479aaffected
  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < df6856c2dda9187601d29b5fbd7a81b3b178cedfaffected
  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < 43de8a49335e611adb271bbd52e84dfbc11fc185affected
  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < ff636d7b7cba6dea82ecf580415ea57f2c1a11b6affected
  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < e078da1b4e11390cff3201c19a9a1fe70c5b934faffected
  • 84c4a9dfbf430861e7588d95ae3ff61535dca351 to < 136992de9bb91871084ae52d172610541c76e4d2affected
  • a7e22d0c0e81dde129a51ee413644124f4b59954affected
  • 01b0d887f67a388fb2a658ee2bdd74e5ba146818affected
  • a98124aac0b5adc5de8ae54f11322781cb4d85c3affected
  • e27b7bee743d921f037b1da6f071237345bef7c1affected
  • 3.0.79 to < 3.1affected
  • 3.2.46 to < 3.3affected
  • 3.4.46 to < 3.5affected
  • 3.9.3 to < 3.10affected

Linux Linux

Default version status: affected

  • 3.10affected
  • 0 to < 3.10unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References