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CVE-2026-98281

Linux: futex: Also allocate private hash on vfork()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.14%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5468a4855b63b30156a79e5248e01bf1a2c18dd7Also 6.18.54, 7.1CVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

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:

futex: Also allocate private hash on vfork()

As Jann demonstrated, it is entirely feasible to access the mm through vfork(). Therefore we need to allocate a private hash on vfork() as well as any other CLONE_VM user.

Specifically, it must be avoided to have (private) futex waiters before allocating the private hash.

Text from CVE List

Affected versions 11

  • Linuxaffected: 1dcd36420af2da5bd59306dba9caf78e3d248b1d before 5468a4855b63b30156a79e5248e01bf1a2c18dd7CVE List
  • Linuxaffected: ee9dce44362b2d8132c32964656ab6dff7dfbc6a before eecbafa8cabbc4d1482f6a5e2acc25a8f934681bCVE List
  • Linuxaffected: ee9dce44362b2d8132c32964656ab6dff7dfbc6a before b61b6f95d6722ddbbbd09e689fa41b55fd36f9a5CVE List
  • Linuxaffected: 974ac49a9a068b0591a59f65c63eb06579a13091CVE List
  • Linuxaffected: 6.18.33 before 6.18.54CVE List
  • Linuxaffected: 7.0.10 before 7.1CVE List
  • Linuxaffected: 7.1CVE List
  • Linuxunaffected: all versions before 7.1CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3