Use-after-free in Linux kernel - CVE-2026-90071
Published: September 19, 2026
Vulnerability identifier: #VU151407
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90071
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a use-after-free.
The vulnerability exists due to failure to restore the skb->dev device pointer in the sch_teql TEQL scheduler when transmitting packets through TEQL slave devices. A local user can cause a packet to retain a stale device pointer after a slave transmission failure.
Exploitation requires a later slave device without a resolved neighbour and deletion of the previous slave while the packet remains queued.
Affected software
Linux kernel
How to mitigate CVE-2026-90071
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/00d8a387b23b7831ad9919256a6b9caaa10f19c3
- https://git.kernel.org/stable/c/012559cf3c67ce8825a31d4f66b040b6fbaf775e
- https://git.kernel.org/stable/c/0cd75037948567193f7f5767176538822ce23873
- https://git.kernel.org/stable/c/1360bc93f5be1be3cf937ebea667b3418dd30a79
- https://git.kernel.org/stable/c/96bc345a3f17543d0d92ada609e02198d6380e26
- https://git.kernel.org/stable/c/aa39a790d56b40bfcf3861653ceb46a3a113adb6
- https://git.kernel.org/stable/c/d453bf439ef230b5743afc25e194adacca8c6e43
- https://git.kernel.org/stable/c/dc4b95b8fee95113587e93ca116356032d271371