CVE-2025-39946

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Source
https://cve.org/CVERecord?id=CVE-2025-39946
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39946.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39946
Downstream
Related
Published
2025-10-04T07:31:07.871Z
Modified
2026-03-12T02:19:14.896293Z
Summary
tls: make sure to abort the stream if headers are bogus
Details

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 tlsrxmsg_size() aborts strp, if we reach an invalid record there's really no way to recover.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39946.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
84c61fe1a75b4255df1e1e7c054c9e6d048da417
Fixed
b36462146d86b1f22e594fe4dae611dffacfb203
Fixed
4cefe5be73886f383639fe0850bb72d5b568a7b9
Fixed
208640e6225cc929a05adbf79d1df558add3e231
Fixed
61ca2da5fb8f433ce8bbd1657c84a86272133e6b
Fixed
0aeb54ac4cd5cf8f60131b4d9ec0b6dc9c27b20d

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39946.json"