PT-2024-8952 · Linux+3 · Linux Kernel+3
Björn Töpel
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Published
2024-05-22
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Updated
2025-04-01
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CVE-2021-47486
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Linux kernel (affected versions not specified)
Description:
The issue is related to a potential NULL dereference in the riscv, bpf components of the Linux kernel. This occurs when the RISC-V BPF JIT fails to converge in NR JIT ITERATIONS steps, resulting in
jit data->header being NULL. The bpf jit binary free() function requires a non-NULL argument, and when this condition is not met, it triggers a NULL dereference. This could allow an attacker to cause a denial of service.Recommendations:
To resolve the issue, check the argument prior to calling the
bpf jit binary free() function to avoid the NULL dereference. As a temporary workaround, consider adding a check for jit data->header being NULL before calling bpf jit binary free() to prevent the NULL dereference. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Red Os
Suse