CVE-2024-49987
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-49987
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49987.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-49987
- Downstream
- Related
- Published
- 2024-10-21T18:02:31Z
- Modified
- 2025-10-09T20:46:41.552694Z
- Summary
- bpftool: Fix undefined behavior in qsort(NULL, 0, ...)
- Details
-
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 nflinkinfo is NULL to prevent calling qsort with a NULL pointer.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734
- https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af
- https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501
- https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd0fe92fb5e3df6991c640fb9205d880b68603259Fixedc2d9f9a7837ab29ccae0c42252f17d436bf0a501
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd0fe92fb5e3df6991c640fb9205d880b68603259Fixed2e0f6f33f2aa87493b365a38a8fd87b8854b7734
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd0fe92fb5e3df6991c640fb9205d880b68603259Fixedc208b02827eb642758cef65641995fd3f38c89af
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd0fe92fb5e3df6991c640fb9205d880b68603259Fixedf04e2ad394e2755d0bb2d858ecb5598718bf00d5