---
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: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-843
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5b5f51bff1b66cedb62b5ba74a1878341204e057 <
    24adbc2c3bbe3385ce922587e1f8e837a68b3e25
  - >-
    Linux >= 5b5f51bff1b66cedb62b5ba74a1878341204e057 <
    0b1c83dc3c4401cd7e846548f62e3caf3d06742e
  - Linux 6.12
published: '2026-09-25'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:18:10.453'
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
  - url: 'https://git.kernel.org/stable/c/c4d3bdb3ab211dcfad734b02e06fcb12adb4757f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98048.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98048'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541306'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98048'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98048'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98048.mbox
  - url: 'https://git.kernel.org/stable/c/a0cd1c3ac63504ba3c50c01a00c11812919b619f'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00168
epssPercentile: 0.0599
cvssSource: vendor
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.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98048.json)