CVE-2026-63912
Last modified
CVE-2026-63912 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.71% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 4.14.288, < 4.15 | — |
| Linux | Linux Kernel | >= 4.19.252, < 4.20 | — |
| Linux | Linux Kernel | >= 5.4.205, < 5.5 | — |
| Linux | Linux Kernel | >= 5.10.113, < 5.10.259 | — |
| Linux | Linux Kernel | >= 5.15.36, < 5.15.210 | — |
| Linux | Linux Kernel | >= 5.17.5, < 5.18 | — |
| Linux | Linux Kernel | >= 5.18.1, < 6.1.176 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.143 | — |
| Linux | Linux Kernel | >= 6.7, < 6.12.93 | — |
| Linux | Linux Kernel | >= 6.13, < 6.18.35 | — |
| Linux | Linux Kernel | >= 6.19, < 7.0.12 | — |
| Linux | Linux Kernel | 5.18 | — |
| Linux | Linux Kernel | 7.1 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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