vxlan: do not arm the ageing timer on a device that is down
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 ne
CVE-2026-74615
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74615
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-74615
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33241 · Revision 1
- Added to Heist Feed
- Publisher date