CVE-2024-49987 (GCVE-0-2024-49987)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2025-05-21 09:13
VLAI?
Title
bpftool: Fix undefined behavior in qsort(NULL, 0, ...)
Summary
In the Linux kernel, the following vulnerability has been resolved: bpftool: Fix undefined behavior in qsort(NULL, 0, ...) When netfilter has no entry to display, qsort is called with qsort(NULL, 0, ...). This results in undefined behavior, as UBSan reports: net.c:827:2: runtime error: null pointer passed as argument 1, which is declared to never be null Although the C standard does not explicitly state whether calling qsort with a NULL pointer when the size is 0 constitutes undefined behavior, Section 7.1.4 of the C standard (Use of library functions) mentions: "Each of the following statements applies unless explicitly stated otherwise in the detailed descriptions that follow: If an argument to a function has an invalid value (such as a value outside the domain of the function, or a pointer outside the address space of the program, or a null pointer, or a pointer to non-modifiable storage when the corresponding parameter is not const-qualified) or a type (after promotion) not expected by a function with variable number of arguments, the behavior is undefined." To avoid this, add an early return when nf_link_info is NULL to prevent calling qsort with a NULL pointer.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d0fe92fb5e3df6991c640fb9205d880b68603259 , < c2d9f9a7837ab29ccae0c42252f17d436bf0a501 (git)
Affected: d0fe92fb5e3df6991c640fb9205d880b68603259 , < 2e0f6f33f2aa87493b365a38a8fd87b8854b7734 (git)
Affected: d0fe92fb5e3df6991c640fb9205d880b68603259 , < c208b02827eb642758cef65641995fd3f38c89af (git)
Affected: d0fe92fb5e3df6991c640fb9205d880b68603259 , < f04e2ad394e2755d0bb2d858ecb5598718bf00d5 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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