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🛡️ CVE-2023-52609 — debian-linux

🟡 CVSS 4.7 — Medium ✅ No Known Exploit CWE-362 NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

binder: fix race between mmput() and do_exit()

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

binder: fix race between mmput() and do_exit()

Task A calls binder_update_page_range() to allocate and insert pages on

a remote address space from Task B. For this, Task A pins the remote mm

via mmget_not_zero() first. This can race with Task B do_exit() and the

final mmput() refcount decrement will come from Task A.

Task A | Task B

------------------+------------------

mmget_not_zero() |

| do_exit()

| exit_mm()

| mmput()

mmput() |

exit_mmap() |

remove_vma() |

fput() |

In this case, the work of ____fput() from Task B is queued up in Task A

as TWA_RESUME. So in theory, Task A returns to userspace and the cleanup

work gets executed. However, Task A instead sleep, waiting for a reply

from Task B that never comes (it's dead).

This means the binder_deferred_release() is blocked until an unrelated

binder event forces Task A to go back to userspace. All the associated

death notifications will also be delayed until then.

In order to fix this use mmput_async() that will schedule the work in

the corresponding mm->async_put_work WQ instead of Task A.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, 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 none, integrity none, availability high.

CVSS metrics in full

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

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • 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: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-52609 is classified as CWE-362: Race Condition. Concurrent operations share state without proper synchronisation, so timing decides whether the result is correct.

Affected software

CVE-2023-52609 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.7.0 up to 6.7.2)
  • linux-kernel (from 6.7 up to 6.7.2)

Timeline and source

Published on 18 March 2024 and last revised on 17 June 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
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
lists.debian.org

Other advisories for this package

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

Same weakness in other software

These advisories are the same class of weakness (CWE-362: Race Condition) in other software:

CVE-2023-52609 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-362
Public Exploit ✅ No
Source NVD
Published 2024-03-18
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.7.0 6.7.2
linux-kernel 6.7 6.7.2

References

Similar Threats

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