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CVE-2026-98222

Linux: KEYS: encrypted: fix integer overflow of datablob_len

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)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1e720f63dbafc093a8f5d519f05b67724993edd4Also 8697c431e297eb0d0ab13dda6bc172b48a34f05cCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 1e720f63dbafc093a8f5d519f05b67724993edd4LinuxCVE List
  • 8697c431e297eb0d0ab13dda6bc172b48a34f05cLinuxCVE 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:

KEYS: encrypted: fix integer overflow of datablob_len

encrypted_key_alloc() stores datablob_len in a u16. It is computed from multiple string and payload lengths. If the result exceeds U16_MAX, the assignment truncates the allocation size. KASAN reports a 32760-byte slab-out-of-bounds write when __ekey_init() copies the master key description into the undersized buffer.

The total payload length stored in key->datalen is also a u16. Use check_add_overflow() to reject values that do not fit either destination, and use kzalloc_flex() for the flexible-array allocation.

Text from CVE List

Affected versions 10

  • Linuxaffected: 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c before 1e720f63dbafc093a8f5d519f05b67724993edd4CVE List
  • Linuxaffected: 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c before a1a98eca102b1cbbc37ff9eaa197ae4e6a3ea4b0CVE List
  • Linuxaffected: 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c before cca38f2102a4cd35eda8d48950df4817b4b24757CVE List
  • Linuxaffected: 7e70cb4978507cf31d76b90e4cfb4c28cad87f0c before 8697c431e297eb0d0ab13dda6bc172b48a34f05cCVE List
  • Linuxaffected: 2.6.38CVE List
  • Linuxunaffected: all versions before 2.6.38CVE 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 4