CVE-2026-63912
Published: July 22, 2026Last modified: July 22, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.177-r0) |
| 25 LTS | linux-lts | Fixed (6.12.95-r0) | |
| Stream | linux-lts | Fixed (6.18.35-r1) |
References
- https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec
- https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708
- https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e
- https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c
- https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095
- https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba
- https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59
- https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40