AZL-47409
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-47409.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-47409
- Upstream
- Published
- 2024-07-30T08:15:07Z
- Modified
- 2026-04-01T05:17:01.462610Z
- Severity
-
- 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H CVSS Calculator
- Summary
- CVE-2024-42161 affecting package kernel for versions less than 5.15.163.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
bpf: Avoid uninitialized value in BPFCOREREAD_BITFIELD
[Changes from V1: - Use a default branch in the switch statement to initialize `val'.]
GCC warns that `val' may be used uninitialized in the BPFCREREADBITFIELD macro, defined in bpfcore_read.h as:
[...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtinpreservefieldinfo returns unexpected values for BPFFIELDBYTESIZE.
Tested in bpf-next master. No regressions.
- References