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CVE-2026-98526

Linux: llc: reserve device headroom for allocated frames

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 in018020f5a48cc86fdd6dc2d380f6c70443ae7639Also 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1, 7c38524b2b2456bd33cb360420da6cbf9cad1b33 and 4 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 018020f5a48cc86fdd6dc2d380f6c70443ae7639LinuxCVE List
  • 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1LinuxCVE List
  • 7c38524b2b2456bd33cb360420da6cbf9cad1b33LinuxCVE List
  • 1937222c2511ac91377d39f28106c34734f5f8c6LinuxCVE List
  • 16ceac2daa89dd16917bc488ab05b9dd6961a603LinuxCVE List
  • 3361c93e417384ebf28003e0fb6d5304653d3b05LinuxCVE List
Show all 7 fixed versions
  • 72b5b9a28b996e09b8b5b944370c79851bb68f52LinuxCVE 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:

llc: reserve device headroom for allocated frames

llc_alloc_frame() reserves link-layer headroom using the device type. This is insufficient for stacked Ethernet devices such as VLAN devices, where vlan_dev_hard_header() pushes a VLAN header before the lower device's Ethernet header. An LLC response on such a device can therefore underflow skb headroom in eth_header().

Use LL_RESERVED_SPACE() to account for the device's actual required headroom while preserving the existing LLC device-type check.

Text from CVE List

Affected versions 18

  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 018020f5a48cc86fdd6dc2d380f6c70443ae7639CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 7c38524b2b2456bd33cb360420da6cbf9cad1b33CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 1937222c2511ac91377d39f28106c34734f5f8c6CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 16ceac2daa89dd16917bc488ab05b9dd6961a603CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before e06f8b6e27cc616d3c587e9784c4a033eb310a16CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 3361c93e417384ebf28003e0fb6d5304653d3b05CVE List
  • Linuxaffected: bf9ae5386bca8836c16e69ab8fdbe46767d7452a before 72b5b9a28b996e09b8b5b944370c79851bb68f52CVE List
  • Linuxaffected: 2.6.34CVE List
  • Linuxunaffected: all versions before 2.6.34CVE 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: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8