Riskcovery

CVE-2024-50112

x86/lam: Disable ADDRESS_MASKING in most cases

State
Published
Severity
7.8 High
Published
Nov 5, 2024
Updated
May 11, 2026
Reserved
Oct 21, 2024

Read the record on cve.org

Description

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

x86/lam: Disable ADDRESS_MASKING in most cases

Linear Address Masking (LAM) has a weakness related to transient execution as described in the SLAM paper[1]. Unless Linear Address Space Separation (LASS) is enabled this weakness may be exploitable.

Until kernel adds support for LASS[2], only allow LAM for COMPILE_TEST, or when speculation mitigations have been disabled at compile time, otherwise keep LAM disabled.

There are no processors in market that support LAM yet, so currently nobody is affected by this issue.

[1] SLAM: https://download.vusec.net/papers/slam_sp24.pdf [2] LASS: https://lore.kernel.org/lkml/20230609183632.48706-1-alexander.shishkin@linux.intel.com/

[ dhansen: update SPECULATION_MITIGATIONS -> CPU_MITIGATIONS ]

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 6449dcb0cac738219d13c618af7fd8664735f99d to before 60a5ba560f296ad8da153f6ad3f70030bfa3958fAffected
  • 6449dcb0cac738219d13c618af7fd8664735f99d to before 690599066488d16db96ac0d6340f9372fc56f337Affected
  • 6449dcb0cac738219d13c618af7fd8664735f99d to before 3267cb6d3a174ff83d6287dcd5b0047bbd912452Affected
LinuxLinux
  • 6.4Affected
  • before 6.4Not affected
  • 6.6.59 through 6.6.*Not affected
  • 6.11.6 through 6.11.*Not affected
  • 6.12 and laterNot affected

References

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