CVE-2024-47728 (GCVE-0-2024-47728)

Vulnerability from cvelistv5 – Published: 2024-10-21 12:14 – Updated: 2025-11-03 22:21
VLAI?
Title
bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error For all non-tracing helpers which formerly had ARG_PTR_TO_{LONG,INT} as input arguments, zero the value for the case of an error as otherwise it could leak memory. For tracing, it is not needed given CAP_PERFMON can already read all kernel memory anyway hence bpf_get_func_arg() and bpf_get_func_ret() is skipped in here. Also, the MTU helpers mtu_len pointer value is being written but also read. Technically, the MEM_UNINIT should not be there in order to always force init. Removing MEM_UNINIT needs more verifier rework though: MEM_UNINIT right now implies two things actually: i) write into memory, ii) memory does not have to be initialized. If we lift MEM_UNINIT, it then becomes: i) read into memory, ii) memory must be initialized. This means that for bpf_*_check_mtu() we're readding the issue we're trying to fix, that is, it would then be able to write back into things like .rodata BPF maps. Follow-up work will rework the MEM_UNINIT semantics such that the intent can be better expressed. For now just clear the *mtu_len on error path which can be lifted later again.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d7a4cb9b6705a89937d12c8158a35a3145dc967a , < 8397bf78988f3ae9dbebb0200189a62a57264980 (git)
Affected: d7a4cb9b6705a89937d12c8158a35a3145dc967a , < a634fa8e480ac2423f86311a602f6295df2c8ed0 (git)
Affected: d7a4cb9b6705a89937d12c8158a35a3145dc967a , < 599d15b6d03356a97bff7a76155c5604c42a2962 (git)
Affected: d7a4cb9b6705a89937d12c8158a35a3145dc967a , < 594a9f5a8d2de2573a856e506f77ba7dd2cefc6a (git)
Affected: d7a4cb9b6705a89937d12c8158a35a3145dc967a , < 4b3786a6c5397dc220b1483d8e2f4867743e966f (git)
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    Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.54 , ≤ 6.6.* (semver)
Unaffected: 6.10.13 , ≤ 6.10.* (semver)
Unaffected: 6.11.2 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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