PT-2025-40642 · Linux+5 · Linux Kernel+5
Syzbot
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Published
2025-09-16
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Updated
2026-04-20
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CVE-2025-39946
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw exists in the Linux kernel's TLS implementation where the system may not properly abort a connection stream when invalid record headers are detected. Specifically, if the socket has a small buffer and data is received in out-of-band sends followed by a large normal send, the parsing process can lead to an overflow of the allocated skb space. The
tls rx msg size() function is involved in this issue, and failing to abort the stream upon detecting an invalid record can cause further data copying and potential memory corruption.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Allocation of Resources Without Limits
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Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu