What’s Vulnerable › Vulnerabilities

CVE-2026-98048: bpf: don't rewrite bpf_fastcall patterns entered by a jump

• Severity: unknown
• 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: 2026-09-25 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: don't rewrite bpf_fastcall patterns entered by a jump mark_fastcall_pattern_for_call() must ensure that matched "spill; call; fill" instruction series is not interrupted by a jump. Otherwise the rewrite applied by bpf_remove_fastcall_spills_fills() is not sound. Record the instructions targeted by jumps in insn_aux_data[*].jump_target when the CFG is built and use this flag to stop growing a pattern at such an instruction. Jumps to the first spill are fine. Note that existing insn_aux_data[*].jmp_point field can't be reused, as it marks subprogram return instructions.

Affected products

• Linux kernel: 6.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b1c83dc3c4401cd7e846548f62e3caf3d06742e
• https://git.kernel.org/stable/c/24adbc2c3bbe3385ce922587e1f8e837a68b3e25
• https://git.kernel.org/stable/c/a0cd1c3ac63504ba3c50c01a00c11812919b619f
• https://git.kernel.org/stable/c/c4d3bdb3ab211dcfad734b02e06fcb12adb4757f

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