CVE-2026-43057

HIGH EPSS 29.0%
Published May 1, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published May 1, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback NETIF_F_IPV6_CSUM only advertises support for checksum offload of packets without IPv6 extension headers. Packets with extension headers must fall back onto software checksumming. Since TSO depends on checksum offload, those must revert to GSO. The below commit introduces that fallback. It always checks network header length. For tunneled packets, the inner header length must be checked instead. Extend the check accordingly. A special case is tunneled packets without inner IP protocol. Such as RFC 6951 SCTP in UDP. Those are not standard IPv6 followed by transport header either, so also must revert to the software GSO path.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
29.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 17

VendorProductVersionRange
linuxlinux_kernel*≥6.1.149  –  <6.1.168
linuxlinux_kernel*≥6.6.103  –  <6.6.134
linuxlinux_kernel*≥6.12.44  –  <6.12.81
linuxlinux_kernel*≥6.16.4  –  <6.17
linuxlinux_kernel*>6.17.1  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea
    Patch