---
id: CVE-2026-98048
title: |-
  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 inte…
summary: |-
  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 inte…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5b5f51bff1b66cedb62b5ba74a1878341204e057 <
    24adbc2c3bbe3385ce922587e1f8e837a68b3e25
  - >-
    Linux >= 5b5f51bff1b66cedb62b5ba74a1878341204e057 <
    0b1c83dc3c4401cd7e846548f62e3caf3d06742e
  - Linux 6.12
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:33.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98048'
references:
  - url: 'https://git.kernel.org/stable/c/0b1c83dc3c4401cd7e846548f62e3caf3d06742e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/24adbc2c3bbe3385ce922587e1f8e837a68b3e25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.847Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.