xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
Summary
| CVE | CVE-2026-64580 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-05 08:16:38 UTC |
| Updated | 2026-08-05 08:16:38 UTC |
| 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 ... |
Risk And Classification
EPSS: 0.001560000 probability, percentile 0.052690000 (date 2026-08-05)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 df6856c2dda9187601d29b5fbd7a81b3b178cedf git | Not specified |
| CNA | Linux | Linux | affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 43de8a49335e611adb271bbd52e84dfbc11fc185 git | Not specified |
| CNA | Linux | Linux | affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 git | Not specified |
| CNA | Linux | Linux | affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 e078da1b4e11390cff3201c19a9a1fe70c5b934f git | Not specified |
| CNA | Linux | Linux | affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 136992de9bb91871084ae52d172610541c76e4d2 git | Not specified |
| CNA | Linux | Linux | affected a7e22d0c0e81dde129a51ee413644124f4b59954 git | Not specified |
| CNA | Linux | Linux | affected 01b0d887f67a388fb2a658ee2bdd74e5ba146818 git | Not specified |
| CNA | Linux | Linux | affected a98124aac0b5adc5de8ae54f11322781cb4d85c3 git | Not specified |
| CNA | Linux | Linux | affected e27b7bee743d921f037b1da6f071237345bef7c1 git | Not specified |
| CNA | Linux | Linux | affected 3.0.79 3.1 semver | Not specified |
| CNA | Linux | Linux | affected 3.2.46 3.3 semver | Not specified |
| CNA | Linux | Linux | affected 3.4.46 3.5 semver | Not specified |
| CNA | Linux | Linux | affected 3.9.3 3.10 semver | Not specified |
| CNA | Linux | Linux | affected 3.10 | Not specified |
| CNA | Linux | Linux | unaffected 3.10 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc4 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.