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CVE-2026-98417

Linux: net: xfrm: reject unrepresentable espintcp transport headers

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 11% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6c29681207bc213188afa603dff2d55e7178a341Also 4a8243fd2e21980fa3fd10c0610e9155057cebd3, 327b2a457dd7d5445f7395f371f3c65de79bd5ce and 2 moreCVE List
Published14 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 6c29681207bc213188afa603dff2d55e7178a341LinuxCVE List
  • 4a8243fd2e21980fa3fd10c0610e9155057cebd3LinuxCVE List
  • 327b2a457dd7d5445f7395f371f3c65de79bd5ceLinuxCVE List
  • 206f396f46149dc8bc4dfd2b54b9879ba3ee1d7dLinuxCVE List
  • 96f01b53c2d05e003b040892256de54a586e8529LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

net: xfrm: reject unrepresentable espintcp transport headers

ESP-in-TCP can hand xfrm packets whose transport header offset no longer fits after the stream parser trims the TCP envelope. The plain transport header reset truncates that offset and triggers the skb warning path.

Use the careful transport-header helper and drop the skb through the existing XFRM error path when the offset cannot be represented.

Text from CVE List

Affected versions 18

  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before d37a5b87577c4b4c1a1dcb000a9dff1df2cf886bCVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 6c29681207bc213188afa603dff2d55e7178a341CVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 4a8243fd2e21980fa3fd10c0610e9155057cebd3CVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before b2b84e73e0386ad0b4f9b8d3afde343e761f5275CVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 327b2a457dd7d5445f7395f371f3c65de79bd5ceCVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before cce630c751279e974fa0bb574d80575e0cc7e8f3CVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 206f396f46149dc8bc4dfd2b54b9879ba3ee1d7dCVE List
  • Linuxaffected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 96f01b53c2d05e003b040892256de54a586e8529CVE List
  • Linuxaffected: 5.6CVE List
  • Linuxunaffected: all versions before 5.6CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8