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TI-2026-31237 Aliases CVE-2026-43057GHSA-rfm2-xxcf-h65g

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback

Priority LOW 33Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.00437 38th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.168, 6.6.134, 6.12.81 +4Red Hat: 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.1.149 to before 6.1.168; 6.6.103 to before 6.6.134; 6.12.44 to before 6.12.81; 6.16.4 to before 6.176.1.168, 6.6.134, 6.12.81, 6.17Patch availableCNA
LinuxLinux6.17 and later6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0Patch availableCNA
  • Linux VendorLinux Affected 6.1.149 to before 6.1.168; 6.6.103 to before 6.6.134; 6.12.44 to before 6.12.81; 6.16.4 to before 6.17 Fixed in 6.1.168, 6.6.134, 6.12.81, 6.17 Patch available CNA
  • Linux VendorLinux Affected 6.17 and later Fixed in 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0 Patch available CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.1.149 to before 6.1.168; 6.6.103 to before 6.6.134; 6.12.44 to before 6.12.81; 6.16.4 to before 6.17; after 6.17.1, before 6.18.22; 6.19 to before 6.19.12VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*6.17VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*6.17 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*6.17 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*6.17 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*6.17 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*6.17 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*7.0 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*7.0 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*7.0 rc3VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.1.149 to before 6.1.168; 6.6.103 to before 6.6.134; 6.12.44 to before 6.12.81; 6.16.4 to before 6.17; after 6.17.1, before 6.18.22; 6.19 to before 6.19.12 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:* Versions 6.17 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* Versions 6.17 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* Versions 6.17 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* Versions 6.17 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* Versions 6.17 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:* Versions 6.17 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*7.0 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*7.0 rc5VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* Versions 7.0 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* Versions 7.0 rc5 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.168, 6.6.134, 6.12.81, 6.17
  • Fix · CNA Linux (Linux) Fixed in 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43057
  2. 2026-10-03 Alias added: GHSA-rfm2-xxcf-h65g
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 6

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences