CVE-2026-43093
Published: May 7, 2026Last modified: June 2, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.175-r0) |
| 25 LTS | linux-lts | Fixed (6.12.85-r0) | |
| Stream | linux-lts | Fixed (6.12.85-r0) |
References
- https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1
- https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67
- https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384
- https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39
- https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104
- https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12
- https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f
- https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931