CVE-2026-46300

CVE Details

Release Date:	2026-05-23
Impact:	Important	What is this?

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.

See more information about CVE-2026-46300 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (kernel-uek)	ELSA-2026-50286	2026-05-25
Oracle Linux version 10 (kernel-uek)	ELSA-2026-50293	2026-06-02
Oracle Linux version 7 (kernel-uek)	ELSA-2026-50288	2026-05-25
Oracle Linux version 7 (kernel-uek)	ELSA-2026-50299	2026-06-03
Oracle Linux version 8 (kernel)	ELSA-2026-19666	2026-05-21
Oracle Linux version 8 (kernel-uek)	ELSA-2026-50287	2026-05-25
Oracle Linux version 8 (kernel-uek)	ELSA-2026-50288	2026-05-25
Oracle Linux version 8 (kernel-uek)	ELSA-2026-50294	2026-06-03
Oracle Linux version 8 (kernel-uek)	ELSA-2026-50299	2026-06-03
Oracle Linux version 9 (kernel-uek)	ELSA-2026-50286	2026-05-25
Oracle Linux version 9 (kernel-uek)	ELSA-2026-50287	2026-05-25
Oracle Linux version 9 (kernel-uek)	ELSA-2026-50293	2026-06-02
Oracle Linux version 9 (kernel-uek)	ELSA-2026-50294	2026-06-03