CVE-2024-42161 (GCVE-0-2024-42161)

Vulnerability from cvelistv5 – Published: 2024-07-30 07:47 – Updated: 2025-11-03 22:02
VLAI?
Title
bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_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 BPF_CRE_READ_BITFIELD macro, defined in bpf_core_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 __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < b694989bb13ed5f166e633faa1eb0f21c6d261a6 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 3364c2ed1c241989847f19cf83e3db903ce689e3 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < a21d76bd0b0d39518e9a4c19f6cf7c042a974aff (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 7e5471b5efebc30dd0bc035cda86693a5c73d45f (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < ff941a8449e712eaf7efca1a13bfb9afd3d99fc2 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 009367099eb61a4fc2af44d4eb06b6b4de7de6db (git)
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    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.222 , ≤ 5.10.* (semver)
Unaffected: 5.15.163 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.9 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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