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.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec Patch
- git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708 Patch
- git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e Patch
- git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c Patch
- git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095 Patch
- git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba Patch
- git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59 Patch
- git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40 Patch
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 54 · as of 14 November 2026
- CWE
- CWE-125
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.