CVE-2026-74615

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74615", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.920Z", "datePublished": "2026-08-22T15:32:00.588Z", "dateUpdated": "2026-10-16T19:06:02.032Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:42.219Z"}, "descriptions": [{"lang": "en", "value": "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 <baul.lee@xbow.com>"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via local RTNETLINK on AF_NETLINK: RTM_NEWLINK creates a vxlan netdev, changelink with IFLA_VXLAN_AGEING arms age_timer, and RTM_DELLINK frees it; remote VXLAN encapsulation/packet receive is not involved.\nAC:L - The attacker fully controls a deterministic sequence on a never-up device: changelink calls mod_timer(jiffies) and dellink frees netdev while the timer stays queued because netif_close_many skips IFF_UP-less devices so vxlan_stop/timer_delete_sync never runs.\nPR:L - rtnetlink_rcv_msg requires CAP_NET_ADMIN for RTM_NEWLINK, RTM_SETLINK, and RTM_DELLINK; unprivileged local users obtain this capability inside a new user and network namespace (unshare -Urn), as stated in the fix commit.\nUI:N - No victim interaction is required; the attacker alone issues netlink create/changelink/delete operations on their own down vxlan interface without bringing the device up or requiring mounts or file access.\nS:C - Slab UAF corruption triggered from CAP_NET_ADMIN inside an unprivileged user/network namespace affects host kernel timer-list memory outside the namespace sandbox, crossing the container-to-host security boundary.\nC:H - KASAN reports slab-use-after-free with an 8-byte write through freed vxlan_dev->age_timer list pointers in __run_timers; UAF on kernel timer structures enables arbitrary kernel memory disclosure via slab heap reuse.\nI:H - expire_timers() writes to freed timer_list entry fields before loading the callback, providing controlled slab corruption; UAF on embedded vxlan_dev timers is exploitable for arbitrary kernel writes and privilege escalation.\nA:H - Confirmed KASAN slab-use-after-free in run_timer_softirq can kernel oops/panic; the dangling timer remains armed after rtnl_dellink and the sequence can be repeated for reliable denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "be44d79d14d7f9ae7c8ffb7272142005341b5123", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "26c179d47403d2f919ee914cc02c31d896b59fee", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "9dc561f0522c35bdd66e0646a748814a138ec4ca", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "619dd29045e439d0b0f8c6d4fec1af447a050680", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "6b095e99b9e67ea31f0c4b00260e010898253519", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "46bb297ad77680e009244f067f27d51cf5b8c7cf", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "6b4119af544996a545cf84b16f1dbce829ba0de8", "status": "affected", "versionType": "git"}, {"version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "b37971686ec59fb027fa4910ba16805e68fddb97", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123"}, {"url": "https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee"}, {"url": "https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca"}, {"url": "https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680"}, {"url": "https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519"}, {"url": "https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf"}, {"url": "https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8"}, {"url": "https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"}], "title": "vxlan: do not arm the ageing timer on a device that is down", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74615", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:02:29.628278Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:02.032Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74615", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:02:29.628278Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:02:30.315Z"}}], "cna": {"title": "vxlan: do not arm the ageing timer on a device that is down", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via local RTNETLINK on AF_NETLINK: RTM_NEWLINK creates a vxlan netdev, changelink with IFLA_VXLAN_AGEING arms age_timer, and RTM_DELLINK frees it; remote VXLAN encapsulation/packet receive is not involved.\nAC:L - The attacker fully controls a deterministic sequence on a never-up device: changelink calls mod_timer(jiffies) and dellink frees netdev while the timer stays queued because netif_close_many skips IFF_UP-less devices so vxlan_stop/timer_delete_sync never runs.\nPR:L - rtnetlink_rcv_msg requires CAP_NET_ADMIN for RTM_NEWLINK, RTM_SETLINK, and RTM_DELLINK; unprivileged local users obtain this capability inside a new user and network namespace (unshare -Urn), as stated in the fix commit.\nUI:N - No victim interaction is required; the attacker alone issues netlink create/changelink/delete operations on their own down vxlan interface without bringing the device up or requiring mounts or file access.\nS:C - Slab UAF corruption triggered from CAP_NET_ADMIN inside an unprivileged user/network namespace affects host kernel timer-list memory outside the namespace sandbox, crossing the container-to-host security boundary.\nC:H - KASAN reports slab-use-after-free with an 8-byte write through freed vxlan_dev->age_timer list pointers in __run_timers; UAF on kernel timer structures enables arbitrary kernel memory disclosure via slab heap reuse.\nI:H - expire_timers() writes to freed timer_list entry fields before loading the callback, providing controlled slab corruption; UAF on embedded vxlan_dev timers is exploitable for arbitrary kernel writes and privilege escalation.\nA:H - Confirmed KASAN slab-use-after-free in run_timer_softirq can kernel oops/panic; the dangling timer remains armed after rtnl_dellink and the sequence can be repeated for reliable denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "be44d79d14d7f9ae7c8ffb7272142005341b5123", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "26c179d47403d2f919ee914cc02c31d896b59fee", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "9dc561f0522c35bdd66e0646a748814a138ec4ca", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "619dd29045e439d0b0f8c6d4fec1af447a050680", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "6b095e99b9e67ea31f0c4b00260e010898253519", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "46bb297ad77680e009244f067f27d51cf5b8c7cf", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "6b4119af544996a545cf84b16f1dbce829ba0de8", "versionType": "git"}, {"status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "lessThan": "b37971686ec59fb027fa4910ba16805e68fddb97", "versionType": "git"}], "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"status": "unaffected", "version": "0", "lessThan": "5.0", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.152", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.104", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.45", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.9", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123"}, {"url": "https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee"}, {"url": "https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca"}, {"url": "https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680"}, {"url": "https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519"}, {"url": "https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf"}, {"url": "https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8"}, {"url": "https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "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 <baul.lee@xbow.com>"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:42.219Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74615", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:06:02.032Z", "dateReserved": "2026-08-15T05:44:03.920Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:00.588Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "be44d79d14d7f9ae7c8ffb7272142005341b5123", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "26c179d47403d2f919ee914cc02c31d896b59fee", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "9dc561f0522c35bdd66e0646a748814a138ec4ca", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "619dd29045e439d0b0f8c6d4fec1af447a050680", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "6b095e99b9e67ea31f0c4b00260e010898253519", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "46bb297ad77680e009244f067f27d51cf5b8c7cf", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "6b4119af544996a545cf84b16f1dbce829ba0de8", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}, {"lessThan": "b37971686ec59fb027fa4910ba16805e68fddb97", "status": "affected", "version": "40051c4dcad5b374156ad9cceae8d15c0ef1cb95", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 <baul.lee@xbow.com>"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvxlan: no activar el temporizador de envejecimiento en un dispositivo que est\u00e1 inactivo\n\nvxlan_changelink() activa vxlan -> age_timer siempre que el intervalo de envejecimiento solicitado difiera del configurado:\n\n\tif (conf.age_interval != vxlan -> cfg.age_interval)\n\t\tmod_timer(&vxlan -> age_timer, jiffies);\n\nNo hay una prueba netif_running(), por lo que el temporizador se activa incluso en un dispositivo que nunca se inici\u00f3. La \u00fanica cancelaci\u00f3n s\u00edncrona en el controlador es timer_delete_sync() en vxlan_stop(), que es .ndo_stop. netif_close_many() descarta dispositivos sin IFF_UP antes de que se ejecute __dev_close_many(), por lo que esa cancelaci\u00f3n se omite para dicho dispositivo.\n\nvxlan_setup() establece dev -> needs_free_netdev = true y age_timer es un miembro de struct vxlan_dev, por lo que free_netdev() libera la asignaci\u00f3n en la que reside el temporizador mientras a\u00fan est\u00e1 en cola en una timer_base. expire_timers() desvincula la entrada antes de que cargue timer -> function, por lo que el n\u00facleo del temporizador escribe a trav\u00e9s de los punteros de lista del objeto liberado:\n\n ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n de slab en __run_timers+0x208/0x654\n Escritura de tama\u00f1o 8 en la direcci\u00f3n ffff00001adace68 por la tarea true/192\n __asan_store8+0x84/0xac\n __run_timers+0x208/0x654\n run_timer_softirq+0x154/0x18c\n Asignado por la tarea 189:\n alloc_netdev_mqs+0x64/0x720\n rtnl_create_link+0x4ac/0x520\n rtnl_newlink+0x758/0xd00\n Liberado por la tarea 191:\n netdev_release+0x40/0x58\n netdev_run_todo+0x4a4/0x8c0\n rtnl_dellink+0x200/0x4e8\n\nLas operaciones rtnl involucradas tienen alcance netns, por lo que un usuario sin privilegios puede realizarlas en un nuevo espacio de nombres de usuario y de red.\n\nActivar el temporizador en un dispositivo inactivo nunca tuvo efecto: vxlan_cleanup() retorna anticipadamente en !netif_running(), y vxlan_open() activa el temporizador para cualquier intervalo distinto de cero una vez que el dispositivo se inicia. A\u00f1adir la prueba que falta.\n\nDescubierto por XBOW, clasificado por Baul Lee <baul.lee@xbow.com>"}], "id": "CVE-2026-74615", "lastModified": "2026-10-16T20:17:46.847", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74615", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:02:29.628278Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:34.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vxlan: do not arm the ageing timer on a device that is down", "id": "2521406", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521406"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvxlan: do not arm the ageing timer on a device that is down\nvxlan_changelink() arms vxlan->age_timer whenever the requested ageing\ninterval differs from the configured one:\nif (conf.age_interval != vxlan->cfg.age_interval)\nmod_timer(&vxlan->age_timer, jiffies);\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.\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:\nBUG: KASAN: slab-use-after-free in __run_timers+0x208/0x654\nWrite of size 8 at addr ffff00001adace68 by task true/192\n__asan_store8+0x84/0xac\n__run_timers+0x208/0x654\nrun_timer_softirq+0x154/0x18c\nAllocated by task 189:\nalloc_netdev_mqs+0x64/0x720\nrtnl_create_link+0x4ac/0x520\nrtnl_newlink+0x758/0xd00\nFreed by task 191:\nnetdev_release+0x40/0x58\nnetdev_run_todo+0x4a4/0x8c0\nrtnl_dellink+0x200/0x4e8\nThe rtnl operations involved are netns-scoped, so an unprivileged user\ncan perform them in a new user and network namespace.\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.\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>", "A flaw was found in the Linux kernel's vxlan module. An unprivileged user can trigger a use-after-free vulnerability by performing specific network-related operations within a new user and network namespace. This can lead to system instability, causing a denial of service, and potentially allowing for arbitrary code execution."], "name": "CVE-2026-74615", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74615\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74615\nhttps://lore.kernel.org/linux-cve-announce/2026082218-CVE-2026-74615-832f@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,be44d79d14d7f9ae7c8ffb7272142005341b5123)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,26c179d47403d2f919ee914cc02c31d896b59fee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,9dc561f0522c35bdd66e0646a748814a138ec4ca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,619dd29045e439d0b0f8c6d4fec1af447a050680)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,6b095e99b9e67ea31f0c4b00260e010898253519)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,46bb297ad77680e009244f067f27d51cf5b8c7cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,6b4119af544996a545cf84b16f1dbce829ba0de8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40051c4dcad5b374156ad9cceae8d15c0ef1cb95,b37971686ec59fb027fa4910ba16805e68fddb97)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T17:00:10.932143+00:00", "updated": "2026-08-25T13:45:04.369056+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-250", "CWE-825"]}