CVE-2024-0564
When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page.
Does this matter?
Lower severity and a low EPSS score (0.62%). Track it; it rarely justifies an emergency change on its own.
Description
A flaw was found in the Linux kernel's memory deduplication mechanism. The max page sharing of Kernel Samepage Merging (KSM), added in Linux kernel version 4.4.0-96.119, can create a side channel. When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page. The unmapping time depends on whether it merges with the victim's page and additional physical pages are created beyond the KSM's "max page share". Through these operations, the attacker can leak the victim's page.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.62% probability · 48th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- linux/linux kernel · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2024-0564Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513Exploit, Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=2258514Issue Tracking
- https://link.springer.com/conference/wisaNot Applicable
- https://wisa.or.kr/acceptedNot Applicable
- https://access.redhat.com/security/cve/CVE-2024-0564Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513Exploit, Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=2258514Issue Tracking
- https://link.springer.com/conference/wisaNot Applicable
- https://wisa.or.kr/acceptedNot Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.