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CVE-2023-53669

tcp: fix skb_copy_ubufs() vs BIG TCP

MEDIUM
5.5
CVSS Score
Published: October 7, 2025 at 03:21 PM UTC
Updated: October 15, 2026 at 10:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.19 ≤ v < 6.1.296.2 ≤ v < 6.2.166.3 ≤ v < 6.3.35.197c4e983c4f3cf94fcd879730c6caa877e0768a4d
Vendor states this is fixed in 3c77a377877acbaf03cd7caa21d3644a5dd16301 (fixed)
Vendor states this is fixed in 7e692df3933628d974acb9f5b334d2b3e885e2a6 (fixed)
Vendor states this is fixed in 7fa93e39fbb0566019c388a8038a4d58552e0910 (fixed)
Vendor states this is fixed in 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f (fixed)
Vendor states this is fixed in 5.19 (unaffected)
Vendor states this is fixed in 6.1.29 (unaffected)
Vendor states this is fixed in 6.2.16 (unaffected)
Vendor states this is fixed in 6.3.3 (unaffected)
Vendor states this is fixed in 6.4 (unaffected)

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-401

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