Vulnerability-Lookup

CVE-2026-74615 (GCVE-0-2026-74615)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:40

Title

vxlan: do not arm the ageing timer on a device that is down

Summary

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not arm the ageing timer on a device that is down vxlan_changelink() arms vxlan->age_timer whenever the requested ageing interval differs from the configured one: if (conf.age_interval != vxlan->cfg.age_interval) mod_timer(&vxlan->age_timer, jiffies); There is no netif_running() test, so the timer is armed even on a device that was never brought up. The only synchronous cancel in the driver is the timer_delete_sync() in vxlan_stop(), which is .ndo_stop. netif_close_many() drops devices without IFF_UP before __dev_close_many() runs, so that cancel is skipped for such a device. vxlan_setup() sets dev->needs_free_netdev = true and age_timer is a member of struct vxlan_dev, so free_netdev() releases the allocation the timer lives in while it is still queued on a timer_base. expire_timers() unlinks the entry before it loads timer->function, so the timer core writes through the freed object's list pointers: BUG: KASAN: slab-use-after-free in __run_timers+0x208/0x654 Write of size 8 at addr ffff00001adace68 by task true/192 __asan_store8+0x84/0xac __run_timers+0x208/0x654 run_timer_softirq+0x154/0x18c Allocated by task 189: alloc_netdev_mqs+0x64/0x720 rtnl_create_link+0x4ac/0x520 rtnl_newlink+0x758/0xd00 Freed by task 191: netdev_release+0x40/0x58 netdev_run_todo+0x4a4/0x8c0 rtnl_dellink+0x200/0x4e8 The rtnl operations involved are netns-scoped, so an unprivileged user can perform them in a new user and network namespace. Arming the timer on a down device never had an effect: vxlan_cleanup() returns early on !netif_running(), and vxlan_open() arms the timer for any non-zero interval once the device is brought up. Add the missing test. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/be44d79d14d7f9ae7…
https://git.kernel.org/stable/c/26c179d47403d2f91…
https://git.kernel.org/stable/c/9dc561f0522c35bdd…
https://git.kernel.org/stable/c/619dd29045e439d0b…
https://git.kernel.org/stable/c/6b095e99b9e67ea31…
https://git.kernel.org/stable/c/46bb297ad77680e00…
https://git.kernel.org/stable/c/6b4119af544996a54…
https://git.kernel.org/stable/c/b37971686ec59fb02…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < be44d79d14d7f9ae7c8ffb7272142005341b5123 (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 26c179d47403d2f919ee914cc02c31d896b59fee (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 9dc561f0522c35bdd66e0646a748814a138ec4ca (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 619dd29045e439d0b0f8c6d4fec1af447a050680 (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 6b095e99b9e67ea31f0c4b00260e010898253519 (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 46bb297ad77680e009244f067f27d51cf5b8c7cf (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < 6b4119af544996a545cf84b16f1dbce829ba0de8 (git) Affected: 40051c4dcad5b374156ad9cceae8d15c0ef1cb95 , < b37971686ec59fb027fa4910ba16805e68fddb97 (git)	guessed
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

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{
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.0"
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              "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"
            }
          ]
        }
      ],
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                  "versionStartIncluding": "5.0",
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                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
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      ],
      "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-\u003eage_timer whenever the requested ageing\ninterval differs from the configured one:\n\n\tif (conf.age_interval != vxlan-\u003ecfg.age_interval)\n\t\tmod_timer(\u0026vxlan-\u003eage_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-\u003eneeds_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-\u003efunction, so\nthe timer core writes through the freed object\u0027s 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 \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_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",
            "version": "3.1"
          },
          "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-\u003eage_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:42.219Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74615",
    "datePublished": "2026-08-22T15:32:00.588Z",
    "dateReserved": "2026-08-15T05:44:03.920Z",
    "dateUpdated": "2026-08-25T05:40:42.219Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74615",
      "date": "2026-08-25",
      "epss": "0.00126",
      "percentile": "0.02487"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:46:23.000Z",
      "cve": "CVE-2026-74615",
      "id": "msrc_CVE-2026-74615",
      "initial_release_date": "2026-08-24T01:01:51.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vxlan: do not arm the ageing timer on a device that is down",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74615.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74615\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:34.143\",\"lastModified\":\"2026-08-25T06:18:39.610\",\"vulnStatus\":\"Received\",\"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-\u003eage_timer whenever the requested ageing\\ninterval differs from the configured one:\\n\\n\\tif (conf.age_interval != vxlan-\u003ecfg.age_interval)\\n\\t\\tmod_timer(\u0026vxlan-\u003eage_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-\u003eneeds_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-\u003efunction, so\\nthe timer core writes through the freed object\u0027s 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 \u003cbaul.lee@xbow.com\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T06:02:49+00:00",
      "cve": "CVE-2026-74615",
      "id": "CVE-2026-74615",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: do not arm the ageing timer on a device that is down",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74615.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:05:55Z",
      "cve": "CVE-2026-74615",
      "id": "CVE-2026-74615",
      "initial_release_date": "2026-08-23T00:05:55Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74615",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74615.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-74615

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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-\u003eage_timer whenever the requested ageing\ninterval differs from the configured one:\n\n\tif (conf.age_interval != vxlan-\u003ecfg.age_interval)\n\t\tmod_timer(\u0026vxlan-\u003eage_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-\u003eneeds_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-\u003efunction, so\nthe timer core writes through the freed object\u0027s 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 \u003cbaul.lee@xbow.com\u003e"
    }
  ],
  "id": "CVE-2026-74615",
  "lastModified": "2026-08-25T06:18:39.610",
  "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"
      }
    ]
  },
  "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"
}

GHSA-M2V3-P29R-XWMJ

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

vxlan: do not arm the ageing timer on a device that is down

vxlan_changelink() arms vxlan->age_timer whenever the requested ageing interval differs from the configured one:

if (conf.age_interval != vxlan->cfg.age_interval)
    mod_timer(&vxlan->age_timer, jiffies);

There is no netif_running() test, so the timer is armed even on a device that was never brought up. The only synchronous cancel in the driver is the timer_delete_sync() in vxlan_stop(), which is .ndo_stop. netif_close_many() drops devices without IFF_UP before __dev_close_many() runs, so that cancel is skipped for such a device.

vxlan_setup() sets dev->needs_free_netdev = true and age_timer is a member of struct vxlan_dev, so free_netdev() releases the allocation the timer lives in while it is still queued on a timer_base. expire_timers() unlinks the entry before it loads timer->function, so the timer core writes through the freed object's list pointers:

BUG: KASAN: slab-use-after-free in __run_timers+0x208/0x654 Write of size 8 at addr ffff00001adace68 by task true/192 __asan_store8+0x84/0xac __run_timers+0x208/0x654 run_timer_softirq+0x154/0x18c Allocated by task 189: alloc_netdev_mqs+0x64/0x720 rtnl_create_link+0x4ac/0x520 rtnl_newlink+0x758/0xd00 Freed by task 191: netdev_release+0x40/0x58 netdev_run_todo+0x4a4/0x8c0 rtnl_dellink+0x200/0x4e8

The rtnl operations involved are netns-scoped, so an unprivileged user can perform them in a new user and network namespace.

Arming the timer on a down device never had an effect: vxlan_cleanup() returns early on !netif_running(), and vxlan_open() arms the timer for any non-zero interval once the device is brought up. Add the missing test.

Discovered by XBOW, triaged by Baul Lee baul.lee@xbow.com

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74615"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:34Z",
    "severity": "HIGH"
  },
  "details": "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-\u003eage_timer whenever the requested ageing\ninterval differs from the configured one:\n\n\tif (conf.age_interval != vxlan-\u003ecfg.age_interval)\n\t\tmod_timer(\u0026vxlan-\u003eage_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-\u003eneeds_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-\u003efunction, so\nthe timer core writes through the freed object\u0027s 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 \u003cbaul.lee@xbow.com\u003e",
  "id": "GHSA-m2v3-p29r-xwmj",
  "modified": "2026-08-25T06:31:23Z",
  "published": "2026-08-22T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74615"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26c179d47403d2f919ee914cc02c31d896b59fee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46bb297ad77680e009244f067f27d51cf5b8c7cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/619dd29045e439d0b0f8c6d4fec1af447a050680"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b095e99b9e67ea31f0c4b00260e010898253519"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b4119af544996a545cf84b16f1dbce829ba0de8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9dc561f0522c35bdd66e0646a748814a138ec4ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be44d79d14d7f9ae7c8ffb7272142005341b5123"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-74615

Vulnerability from csaf_microsoft - Published: 2026-08-24 01:01 - Updated: 2026-08-24 14:46

Summary

vxlan: do not arm the ageing timer on a device that is down

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-74615

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-74615 vxlan: do not arm the ageing timer on a device that is down - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74615.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "vxlan: do not arm the ageing timer on a device that is down",
    "tracking": {
      "current_release_date": "2026-08-24T14:46:23.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.279Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-74615",
      "initial_release_date": "2026-08-24T01:01:51.000Z",
      "revision_history": [
        {
          "date": "2026-08-24T01:01:51.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:46:23.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.150.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-74615",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-74615 vxlan: do not arm the ageing timer on a device that is down - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74615.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-24T01:01:51.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "vxlan: do not arm the ageing timer on a device that is down"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74615 (GCVE-0-2026-74615)

FKIE_CVE-2026-74615

GHSA-M2V3-P29R-XWMJ

MSRC_CVE-2026-74615

Tags

Sightings

Nomenclature