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🛡️ CVE-2024-47794 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

bpf: Prevent tailcall infinite loop caused by freplace

In the Linux kernel, the following vulnerability has been resolved:

bpf: Prevent tailcall infinite loop caused by freplace

There is a potential infinite loop issue that can occur when using a

combination of tail calls and freplace.

In an upcoming selftest, the attach target for entry_freplace of

tailcall_freplace.c is subprog_tc of tc_bpf2bpf.c, while the tail call in

entry_freplace leads to entry_tc. This results in an infinite loop:

entry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc.

The problem arises because the tail_call_cnt in entry_freplace resets to

zero each time entry_freplace is executed, causing the tail call mechanism

to never terminate, eventually leading to a kernel panic.

To fix this issue, the solution is twofold:

1. Prevent updating a program extended by an freplace program to a

prog_array map.

2. Prevent extending a program that is already part of a prog_array map

with an freplace program.

This ensures that:

  • If a program or its subprogram has been extended by an freplace program,

it can no longer be updated to a prog_array map.

  • If a program has been added to a prog_array map, neither it nor its

subprograms can be extended by an freplace program.

Moreover, an extension program should not be tailcalled. As such, return

-EINVAL if the program has a type of BPF_PROG_TYPE_EXT when adding it to a

prog_array map.

Additionally, fix a minor code style issue by replacing eight spaces with a

tab for proper formatting.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-47794 is recorded against 2 packages.

  • kernel (from 5.6.0 up to 6.12.5)
  • linux-kernel (from 5.6 up to 6.12.5)

Timeline and source

Published on 11 January 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-01-11
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 5.6.0 6.12.5
linux-kernel 5.6 6.12.5

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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