{"id":"CVE-2026-64580","revision":null,"records":[{"revision":"199bb0f45a6047a58bdeee7b0e869981","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64580","aliases":[],"title":"xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()\n\nOn the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst()\nreleases the device reference with netdev_put() but leaves\nxdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n to become free\").\n\nClear xdst->u.dst.dev after the netdev_put(), the same way the XFRM\ndevice-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in\nnet/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error.\n\n ref_tracker: reference already released.\n ref_tracker: allocated in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86)\n ...\n udpv6_sendmsg (net/ipv6/udp.c:1696)\n ...\n ref_tracker: freed in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90)\n ...\n WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780\n dst_destroy (net/core/dst.c:115)\n rcu_core\n handle_softirqs\n ...","state":0,"publishedAt":"2026-08-05T08:09:34.946+00:00","modifiedAt":"2026-10-19T20:48:42.908+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/xfrm6_policy.c\"\n ],\n \"versions\": [\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"97e032e5733e49471fb73de117ea2ac1ac7c479a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"df6856c2dda9187601d29b5fbd7a81b3b178cedf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"43de8a49335e611adb271bbd52e84dfbc11fc185\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"ff636d7b7cba6dea82ecf580415ea57f2c1a11b6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"e078da1b4e11390cff3201c19a9a1fe70c5b934f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"84c4a9dfbf430861e7588d95ae3ff61535dca351\",\n \"lessThan\": \"136992de9bb91871084ae52d172610541c76e4d2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7e22d0c0e81dde129a51ee413644124f4b59954\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"01b0d887f67a388fb2a658ee2bdd74e5ba146818\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a98124aac0b5adc5de8ae54f11322781cb4d85c3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e27b7bee743d921f037b1da6f071237345bef7c1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3.0.79\",\n \"lessThan\": \"3.1\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"3.2.46\",\n \"lessThan\": \"3.3\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"3.4.46\",\n \"lessThan\": \"3.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"3.9.3\",\n \"lessThan\": \"3.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/xfrm6_policy.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.148\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.101\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.42\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.6\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a","https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf","https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185","https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6","https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f","https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64580","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64580","identifiers":["CVE-2026-64580"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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