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.
References
Configurations
Configuration 1 (hide)
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History
27 Jan 2026, 19:51
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/0aeb54ac4cd5cf8f60131b4d9ec0b6dc9c27b20d - Patch | |
| References | () https://git.kernel.org/stable/c/208640e6225cc929a05adbf79d1df558add3e231 - Patch | |
| References | () https://git.kernel.org/stable/c/4cefe5be73886f383639fe0850bb72d5b568a7b9 - Patch | |
| References | () https://git.kernel.org/stable/c/61ca2da5fb8f433ce8bbd1657c84a86272133e6b - Patch | |
| References | () https://git.kernel.org/stable/c/b36462146d86b1f22e594fe4dae611dffacfb203 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* |
|
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
04 Oct 2025, 08:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-04 08:15
Updated : 2026-01-27 19:51
NVD link : CVE-2025-39946
Mitre link : CVE-2025-39946
CVE.ORG link : CVE-2025-39946
JSON object : View
Products Affected
linux
- linux_kernel
CWE