CVE-2025-37893

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.

Reserved 2025-04-16 | Published 2025-04-18 | Updated 2025-05-26 | Assigner Linux

Product status

Default status
unaffected

5dc615520c4dfb358245680f1904bad61116648e before b3ffad2f02db4aace6799fe0049508b8925eae45
affected

5dc615520c4dfb358245680f1904bad61116648e before 205a2182c51ffebaef54d643e3745e720cded08b
affected

5dc615520c4dfb358245680f1904bad61116648e before c74d95a5679741ef428974ab788f5b0758dc78ae
affected

5dc615520c4dfb358245680f1904bad61116648e before 48b904de2408af5f936f0e03f48dfcddeab58aa0
affected

5dc615520c4dfb358245680f1904bad61116648e before 7e2586991e36663c9bc48c828b83eab180ad30a9
affected

Default status
affected

6.1
affected

Any version before 6.1
unaffected

6.6.87
unaffected

6.12.23
unaffected

6.13.11
unaffected

6.14.2
unaffected

6.15
unaffected

References

git.kernel.org/...c/b3ffad2f02db4aace6799fe0049508b8925eae45

git.kernel.org/...c/205a2182c51ffebaef54d643e3745e720cded08b

git.kernel.org/...c/c74d95a5679741ef428974ab788f5b0758dc78ae

git.kernel.org/...c/48b904de2408af5f936f0e03f48dfcddeab58aa0

git.kernel.org/...c/7e2586991e36663c9bc48c828b83eab180ad30a9

cve.org (CVE-2025-37893)

nvd.nist.gov (CVE-2025-37893)

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