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CVE-2023-3609 (GCVE-0-2023-3609)

Vulnerability from cvelistv5 – Published: 2023-07-21 20:47 – Updated: 2026-07-30 16:34
VLAI
Title
Use-after-free in Linux kernel's net/sched: cls_u32 component
Summary
A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-05 18:36 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Kernel Affected: 4.14.0 , < 4.14.322 (semver)
Affected: 4.15.0 , < 4.19.291 (semver)
Affected: 4.20.0 , < 5.4.248 (semver)
Affected: 5.5.0 , < 5.10.185 (semver)
Affected: 5.11.0 , < 5.15.118 (semver)
Affected: 5.16.0 , < 6.1.35 (semver)
Affected: 6.2.0 , < 6.3.9 (semver)
Unaffected: 6.4.0 (semver)
Unaffected: 04c55383fa5689357bcdd2c8036725a55ed632bc (git)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2023-06-09 10:40
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.