CVE-2026-90114 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506691
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90114 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: Reject descending VLAN tunnel ranges
A pair of descending VLAN and tunnel IDs can pass the tunnel range span check. The VLAN subtraction produces a negative int, which is converted to unsigned when compared with the u32 tunnel ID subtraction. It can therefore equal the wrapped tunnel ID delta.
The range loop then performs no iterations. Since the batched notification handling added a post-loop error check, this leaves err uninitialized and makes the request's return value unpredictable.
Reject descending VLAN ranges before comparing the spans. Valid ascending and single-entry ranges remain unchanged, while malformed descending ranges consistently return -EINVAL.
This issue was found by a static analysis checker and confirmed by manual source review.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90114
- https://git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae
- https://git.kernel.org/stable/c/1181f6bad009408a259bab6aaf0681f11b487972
- https://git.kernel.org/stable/c/434849b21ef56b09d16e6366b2a230002f363e45
- https://git.kernel.org/stable/c/4b0f5b25f114651f03058395b490626c4444875e
- https://git.kernel.org/stable/c/5a8e0e3a18b5e3172343b8479c5d04187f5b4795
- https://git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38
- https://git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17
- https://git.kernel.org/stable/c/c0444d7499f113d6b7803ef0175591464e17525e