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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:40
VLAI
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
References
Impacted 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)
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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)
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{
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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"
        }
      ],
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        {
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            "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"
          },
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            {
              "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."
            }
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        }
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      "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"
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        {
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/b37971686ec59fb027fa4910ba16805e68fddb97"
        }
      ],
      "title": "vxlan: do not arm the ageing timer on a device that is down",
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        "engine": "bippy-1.2.0"
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    "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"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74615",
      "date": "2026-09-16",
      "epss": "0.00126",
      "percentile": "0.02599"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:53:47.000Z",
      "cve": "CVE-2026-74615",
      "id": "msrc_CVE-2026-74615",
      "initial_release_date": "2026-08-24T01:01:51.000Z",
      "product_status:fixed": "1",
      "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": "3"
    },
    "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": "important",
      "current_release_date": "2026-09-15T01:17:46Z",
      "cve": "CVE-2026-74615",
      "id": "CVE-2026-74615",
      "initial_release_date": "2026-08-23T00:05:55Z",
      "product_status:first_fixed": "69",
      "product_status:known_affected": "264",
      "product_status:known_not_affected": "93",
      "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": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.