CVE-2023-53669

MEDIUM EPSS 3.1%
Published Oct 7, 20258mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 7, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy using hugepages, and skb length bigger than ~68 KB. skb_copy_ubufs() assumed it could copy all payload using up to MAX_SKB_FRAGS order-0 pages. This assumption broke when BIG TCP was able to put up to 512 KB per skb. We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45 and limit gso_max_size to 180000. A solution is to use higher order pages if needed. v2: add missing __GFP_COMP, or we leak memory.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥5.19  –  <6.1.29
linuxlinux_kernel*≥6.2  –  <6.2.16
linuxlinux_kernel*≥6.3  –  <6.3.3

References 4

  • git.kernel.org https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
    Patch