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CVE-2025-39946— tls: make sure to abort the stream if headers are bogus

CVSS 9.8 · Critical EPSS 0.03% · P10
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I. Basic Information for CVE-2025-39946

Vulnerability Information
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Vulnerability Title
tls: make sure to abort the stream if headers are bogus
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tls: make sure to abort the stream if headers are bogus Normally we wait for the socket to buffer up the whole record before we service it. If the socket has a tiny buffer, however, we read out the data sooner, to prevent connection stalls. Make sure that we abort the connection when we find out late that the record is actually invalid. Retrying the parsing is fine in itself but since we copy some more data each time before we parse we can overflow the allocated skb space. Constructing a scenario in which we're under pressure without enough data in the socket to parse the length upfront is quite hard. syzbot figured out a way to do this by serving us the header in small OOB sends, and then filling in the recvbuf with a large normal send. Make sure that tls_rx_msg_size() aborts strp, if we reach an invalid record there's really no way to recover.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于TLS流未在发现无效记录头时及时中止，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 84c61fe1a75b4255df1e1e7c054c9e6d048da417 ~ b36462146d86b1f22e594fe4dae611dffacfb203 -
LinuxLinux 6.0 -

II. Public POCs for CVE-2025-39946

#POC DescriptionSource LinkShenlong Link
1Exploit for CVE-2025-39946, a bug in the Linux kernel's net/tls subsystem.https://github.com/farazsth98/exploit-CVE-2025-39946POC Details
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III. Intelligence Information for CVE-2025-39946

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Same Patch Batch · Linux · 2025-10-04 · 144 CVEs total

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Showing top 20 of 144 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39946

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