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
...

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
84c4a9dfbf430861e7588d95ae3ff61535dca351 affected < df6856c2dda9187601d29b5fbd7a81b3b178cedf
84c4a9dfbf430861e7588d95ae3ff61535dca351 affected < 43de8a49335e611adb271bbd52e84dfbc11fc185
84c4a9dfbf430861e7588d95ae3ff61535dca351 affected < ff636d7b7cba6dea82ecf580415ea57f2c1a11b6
84c4a9dfbf430861e7588d95ae3ff61535dca351 affected < e078da1b4e11390cff3201c19a9a1fe70c5b934f
84c4a9dfbf430861e7588d95ae3ff61535dca351 affected < 136992de9bb91871084ae52d172610541c76e4d2
a7e22d0c0e81dde129a51ee413644124f4b59954 affected —
01b0d887f67a388fb2a658ee2bdd74e5ba146818 affected —
a98124aac0b5adc5de8ae54f11322781cb4d85c3 affected —
e27b7bee743d921f037b1da6f071237345bef7c1 affected —
3.0.79 affected < 3.1
3.2.46 affected < 3.3
3.4.46 affected < 3.5
3.9.3 affected < 3.10
Linux Linux affected
Version Status Constraints
3.10 affected —
0 unaffected < 3.10
6.6.148 unaffected ≤ 6.6.*
6.12.101 unaffected ≤ 6.12.*
6.18.42 unaffected ≤ 6.18.*
7.1.6 unaffected ≤ 7.1.*
7.2-rc4 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2 cve-icon
https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185 cve-icon
https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf cve-icon
https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f cve-icon
https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 cve-icon
History

Wed, 05 Aug 2026 09:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-415
CWE-416

Wed, 05 Aug 2026 08:15:00 +0000

Type Values Removed Values Added
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 ...
Title xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-05T08:09:34.946Z

Reserved: 2026-07-19T15:36:31.798Z

Link: CVE-2026-64580

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-08-05T09:30:11Z

Weaknesses