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CVE-2026-68295: LoongArch: BPF: Zero-extend signed ALU32 div/mod results

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Zero-extend signed ALU32 div/mod results ALU32 operations write a 32-bit result and leave the upper 32 bits of the BPF register zero. The LoongArch JIT sign-extends the result of signed ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient or remainder leaves bits 63:32 set in JITted code while the verifier and interpreter model those bits as zero. Keep sign-extension on the operands, which signed divide needs, and zero-extend the ALU32 result after the divide or modulo instruction, matching the unsigned ALU32 div/mod paths and every other ALU32 operation in this JIT.

Affected products

• Linux kernel: 6.7 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/16656c3d734693be3d8a36dbf9d09142b69f3ddc
• https://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45
• https://git.kernel.org/stable/c/7577cca85f2d4590c9d9423ba72ef54181a713c9
• https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6

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