Answer in brief
CVE-2026-64580 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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.
Answer in brief
CVE-2026-64580 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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.