CVE-2026-43284

High

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().

Package Linux Kernel
Published 2026-05-08
Last modified 2026-05-26
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

8.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness type

CWE-123

CVE-2026-43284 is classified as CWE-123

See CWE-123 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.11 and later are affected. Fixed in 5.10.255, 5.15.205, 5.15.206, 6.1.171, 6.1.172, 6.6.138, 6.12.87, 6.18.28, 7.0.5, 7.1-rc3 and their respective stable series.

Affected from
≥ 4.11
Fixed in
✓ 5.10.255 5.10.x ✓ 5.15.205 5.15.x ✓ 5.15.206 5.15.x ✓ 6.1.171 6.1.x ✓ 6.1.172 6.1.x ✓ 6.6.138 6.6.x ✓ 6.12.87 6.12.x ✓ 6.18.28 6.18.x ✓ 7.0.5 7.0.x ✓ 7.1-rc3

References

The following references provide additional information about CVE-2026-43284 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

10 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2026-43284?

    CVE-2026-43284 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 . It affects Linux kernel versions from 4.11 onward and has been patched in 5.10.255, 5.15.205, 5.15.206 and others. CVE-2026-43284 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-43284?

    CVE-2026-43284 has a CVSS score of 8.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H .

  • Is there a patch available for CVE-2026-43284?

    Yes — CVE-2026-43284 has been patched. Fixed versions include 5.10.255, 5.15.205, 5.15.206 and others. If you are running Linux kernel 4.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-43284 actively exploited?

    No — CVE-2026-43284 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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