{"id":"CVE-2026-74615","revision":"d14d3f6cf986497da6720a04748d42fd","records":[{"revision":"d14d3f6cf986497da6720a04748d42fd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74615","aliases":[],"title":"vxlan: do not arm the ageing timer on a device that is down","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: do not arm the ageing timer on a device that is down\n\nvxlan_changelink() arms vxlan->age_timer whenever the requested ageing\ninterval differs from the configured one:\n\n\tif (conf.age_interval != vxlan->cfg.age_interval)\n\t\tmod_timer(&vxlan->age_timer, jiffies);\n\nThere is no netif_running() test, so the timer is armed even on a device\nthat was never brought up. The only synchronous cancel in the driver is\nthe timer_delete_sync() in vxlan_stop(), which is .ndo_stop.\nnetif_close_many() drops devices without IFF_UP before\n__dev_close_many() runs, so that cancel is skipped for such a device.\n\nvxlan_setup() sets dev->needs_free_netdev = true and age_timer is a\nmember of struct vxlan_dev, so free_netdev() releases the allocation the\ntimer lives in while it is still queued on a timer_base.\nexpire_timers() unlinks the entry before it loads timer->function, so\nthe timer core writes through the freed object's list pointers:\n\n BUG: KASAN: slab-use-after-free in __run_timers+0x208/0x654\n Write of size 8 at addr ffff00001adace68 by task true/192\n __asan_store8+0x84/0xac\n __run_timers+0x208/0x654\n run_timer_softirq+0x154/0x18c\n Allocated by task 189:\n alloc_netdev_mqs+0x64/0x720\n rtnl_create_link+0x4ac/0x520\n rtnl_newlink+0x758/0xd00\n Freed by task 191:\n netdev_release+0x40/0x58\n netdev_run_todo+0x4a4/0x8c0\n rtnl_dellink+0x200/0x4e8\n\nThe rtnl operations involved are netns-scoped, so an unprivileged user\ncan perform them in a new user and network namespace.\n\nArming the timer on a down device never had an effect: vxlan_cleanup()\nreturns early on !netif_running(), and vxlan_open() arms the timer for\nany non-zero interval once the device is brought up. Add the missing\ntest.\n\nDiscovered by XBOW, triaged by Baul Lee ","state":0,"publishedAt":"2026-08-22T15:32:00.588+00:00","modifiedAt":"2026-10-16T19:06:02.032+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 \"drivers/net/vxlan/vxlan_core.c\"\n ],\n \"versions\": [\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"be44d79d14d7f9ae7c8ffb7272142005341b5123\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"26c179d47403d2f919ee914cc02c31d896b59fee\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"9dc561f0522c35bdd66e0646a748814a138ec4ca\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"619dd29045e439d0b0f8c6d4fec1af447a050680\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"6b095e99b9e67ea31f0c4b00260e010898253519\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"46bb297ad77680e009244f067f27d51cf5b8c7cf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"6b4119af544996a545cf84b16f1dbce829ba0de8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"40051c4dcad5b374156ad9cceae8d15c0ef1cb95\",\n \"lessThan\": \"b37971686ec59fb027fa4910ba16805e68fddb97\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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 \"drivers/net/vxlan/vxlan_core.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\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\": \"6.6.152\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.104\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.45\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.9\",\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:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123","https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee","https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca","https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680","https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519","https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf","https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8","https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74615","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74615","identifiers":["CVE-2026-74615"]},"retained":false,"historicalAffected":[]}],"coverage":[]}