Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix off-by-one error in build_prologue() Vincent reported that running BPF progs with tailcalls on LoongArch causes kernel hard lockup. Debugging the issues shows that the JITed image missing a jirl instruction at the end of the epilogue. There are two passes in JIT compiling, the first pass set the flags and the second pass generates JIT code based on those flags. With BPF progs mixing bpf2bpf and tailcalls, build_prologue() generates N insns in the first pass and then generates N+1 insns in the second pass. This makes epilogue_offset off by one and we will jump to some unexpected insn and cause lockup. Fix this by inserting a nop insn.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.1, < 6.1.134 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/205a2182c51ffebaef54d643e3745e720cded08bPatch
- https://git.kernel.org/stable/c/48b904de2408af5f936f0e03f48dfcddeab58aa0Patch
- https://git.kernel.org/stable/c/7e2586991e36663c9bc48c828b83eab180ad30a9Patch
- https://git.kernel.org/stable/c/b3ffad2f02db4aace6799fe0049508b8925eae45Patch
- https://git.kernel.org/stable/c/c74d95a5679741ef428974ab788f5b0758dc78aePatch
FAQ
What is CVE-2025-37893?
CVE-2025-37893 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix off-by-one error in build_prologue() Vincent reported that running BPF progs with tailcalls on LoongArch cause...
How severe is CVE-2025-37893?
CVE-2025-37893 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-37893?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.