# CVE-2026-98572: bpf: Fix immediate JMP JEQ/JNE on MIPS32

CVE-2026-98572 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98572, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98572
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98572

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-98572](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98572.md) | Oct 19, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98572](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98572.md) | Oct 19, 2026 |
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98572](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98572.md) | Oct 19, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-98572](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98572.md) | Oct 19, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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