CVE-2026-64580xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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 ...
Timeline
ID reserved
By Linux
- 17 days later
· 17 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < 97e032e5733e49471fb73de117ea2ac1ac7c479a
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < df6856c2dda9187601d29b5fbd7a81b3b178cedf
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < 43de8a49335e611adb271bbd52e84dfbc11fc185
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < ff636d7b7cba6dea82ecf580415ea57f2c1a11b6
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < e078da1b4e11390cff3201c19a9a1fe70c5b934f
- affected 84c4a9dfbf430861e7588d95ae3ff61535dca351 – < 136992de9bb91871084ae52d172610541c76e4d2
- affected a7e22d0c0e81dde129a51ee413644124f4b59954
- affected 01b0d887f67a388fb2a658ee2bdd74e5ba146818
- affected a98124aac0b5adc5de8ae54f11322781cb4d85c3
- affected e27b7bee743d921f037b1da6f071237345bef7c1
- affected 3.0.79 – < 3.1
- affected 3.2.46 – < 3.3
- affected 3.4.46 – < 3.5
- affected 3.9.3 – < 3.10
- affected 3.10
- unaffected < 3.10
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a (opens in a new tab)
- https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf (opens in a new tab)
- https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185 (opens in a new tab)
- https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 (opens in a new tab)
- https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f (opens in a new tab)
- https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-53274 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64580)Record last updated .