CVE-2026-74615: linux
Vulnerability summary
CVE-2026-74615 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 19 · Related 18Timeline
- 22-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
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>
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.13% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu165 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
- linux-6.12< 6.12.107-1~deb12u1
Linux1 product
- linux≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < be44d79d14d7f9ae7c8ffb7272142005341b5123 | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 26c179d47403d2f919ee914cc02c31d896b59fee | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 9dc561f0522c35bdd66e0646a748814a138ec4ca | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 619dd29045e439d0b0f8c6d4fec1af447a050680 | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 6b095e99b9e67ea31f0c4b00260e010898253519 | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 46bb297ad77680e009244f067f27d51cf5b8c7cf | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < 6b4119af544996a545cf84b16f1dbce829ba0de8 | ≥ 40051c4dcad5b374156ad9cceae8d15c0ef1cb95, < b37971686ec59fb027fa4910ba16805e68fddb97 | 5.0
3 vendors · 168 products
