Answer in brief
CVE-2026-64580 records a High severity (CVSS 7.8) vulnerability in xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <df6856c2dda9187601d29b5fbd7a81b3b178cedf || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <43de8a49335e611adb271bbd52e84dfbc11fc185 || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <e078da1b4e11390cff3201c19a9a1fe70c5b934f || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <136992de9bb91871084ae52d172610541c76e4d2 || a7e22d0c0e81dde129a51ee413644124f4b59954 || 01b0d887f67a388fb2a658ee2bdd74e5ba146818 || a98124aac0b5adc5de8ae54f11322781cb4d85c3 || e27b7bee743d921f037b1da6f071237345bef7c1 || >=3.0.79 <3.1 || >=3.2.46 <3.3 || >=3.4.46 <3.5 || >=3.9.3 <3.10 | df6856c2dda9187601d29b5fbd7a81b3b178cedf, 43de8a49335e611adb271bbd52e84dfbc11fc185, ff636d7b7cba6dea82ecf580415ea57f2c1a11b6, e078da1b4e11390cff3201c19a9a1fe70c5b934f, 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.3, 3.5, 3.10 |
| Linux/Linuxgeneric | 3.10 | Not reported |
| Linux/Linuxgeneric | >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <97e032e5733e49471fb73de117ea2ac1ac7c479a || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <df6856c2dda9187601d29b5fbd7a81b3b178cedf || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <43de8a49335e611adb271bbd52e84dfbc11fc185 || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <e078da1b4e11390cff3201c19a9a1fe70c5b934f || >=84c4a9dfbf430861e7588d95ae3ff61535dca351 <136992de9bb91871084ae52d172610541c76e4d2 || a7e22d0c0e81dde129a51ee413644124f4b59954 || 01b0d887f67a388fb2a658ee2bdd74e5ba146818 || a98124aac0b5adc5de8ae54f11322781cb4d85c3 || e27b7bee743d921f037b1da6f071237345bef7c1 || >=3.0.79 <3.1 || >=3.2.46 <3.3 || >=3.4.46 <3.5 || >=3.9.3 <3.10 | 97e032e5733e49471fb73de117ea2ac1ac7c479a, df6856c2dda9187601d29b5fbd7a81b3b178cedf, 43de8a49335e611adb271bbd52e84dfbc11fc185, ff636d7b7cba6dea82ecf580415ea57f2c1a11b6, e078da1b4e11390cff3201c19a9a1fe70c5b934f, 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.3, 3.5, 3.10 |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 ...
Quoted source text, attributed separately from HOL analysis.