AZL-49221
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-49221.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-49221
- Upstream
- Published
- 2024-09-11T16:15:07Z
- Modified
- 2026-04-01T05:17:20.157510Z
- 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-2024-45020 affecting package kernel for versions less than 6.6.51.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a kernel verifier crash in stacksafe()
Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code:
if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false;The 'i' iterates old->allocatedstack. If cur->allocatedstack < old->allocated_stack the out-of-bound access will happen.
To fix the issue add 'i >= cur->allocatedstack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slottype[i % BPFREGSIZE] memory access is legal.
- References