$ cve CVE-2026-46300 JSON

CVE-2026-46300 EXPLOIT

7.8

HIGH · CVSS 3.1 · EPSS 2.4% (pctl 84)

Patch early

A public exploit exists.

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

Scoring

CVSS	7.8 (HIGH, v3.1)
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS	2.43% — more likely to be exploited than 84% of all CVEs
Weakness	CWE-787
On CISA KEV	no
Public exploit	yes
Published	2026-05-23
Last modified	2026-09-08

Affected (1)

Vendor	Product
linux	linux kernel

Public exploits

Source	Title	Date
exploit-db	Linux Kernel - Local Privilege Escalation	2026-05-29

References

→ the Explorer · watch your stack · NVD