AZL-42474
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-42474.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-42474
- Upstream
- Published
- 2024-05-30T16:15:12Z
- Modified
- 2026-04-01T05:14:36.027183Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-36891 affecting package kernel for versions less than 6.6.35.1-4
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mapletree: fix masemptyarearev() null pointer dereference
Currently the code calls masstart() followed by masdataend() if the maple state is MASTART, but masstart() may return with the maple state node == NULL. This will lead to a null pointer dereference when checking information in the NULL node, which is done in masdata_end().
Avoid setting the offset if there is no node by waiting until after the maple state is checked for an empty or single entry state.
A user could trigger the events to cause a kernel oops by unmapping all vmas to produce an empty maple tree, then mapping a vma that would cause the scenario described above.
- References