CVE-2026-98572
Published Oct 18, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix immediate JMP JEQ/JNE on MIPS32 An addu instruction was emitted instead of addiu, causing the immediate value 1 to be interpreted as register $at. This made the comparison result invalid when the immediate operand was negative. Note that $at is mapped to BPF_REG_AX, which is used for constant blinding. Fix the instruction to use the immediate form. Found with test_bpf on MIPS32r1 emulated by QEMU.
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References
Other References
https://git.kernel.org/stable/c/1547e9f3a7d71971216e6dba30270cae13fe4e02
https://git.kernel.org/stable/c/1bd91670966a7142ac94f2cebe2b5ae6bf5cb0c8
https://git.kernel.org/stable/c/6f939529ed6c580e9b6c5daa20be67fa0b3d4cf0
https://git.kernel.org/stable/c/876ef04c75c2751acfd355606fca3eced71dec65
https://git.kernel.org/stable/c/beeae92e70e705e90a0d6d9b3b8498ee3b92f495
https://git.kernel.org/stable/c/db762fd96be225bd06161c9631160c755d891693
Frequently Asked Questions
What is CVE-2026-98572? +
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix immediate JMP JEQ/JNE on MIPS32
An addu instruction was emitted instead of addiu, causing the immediate
value 1 to be interpreted as register $at. This made the comparison
result invalid when the immediate operand was negative. Note that $at
is mapped to BPF_REG_AX, which is used for constant blinding.
Fix the instruction to use the immediate form.
Found with test_bpf on MIPS32r1 emulated by QEMU.
How do I check if I'm vulnerable to CVE-2026-98572? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.