CVE-2025-37893
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.
Does this matter?
Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.27% probability · 19th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-193
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.