tls: make sure to abort the stream if headers are bogus

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Summary

CVECVE-2025-39946
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-04 08:15:47 UTC
Updated2026-04-02 09:16:19 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 84c61fe1a75b4255df1e1e7c054c9e6d048da417 b36462146d86b1f22e594fe4dae611dffacfb203 git Not specified
CNA Linux Linux affected 84c61fe1a75b4255df1e1e7c054c9e6d048da417 4cefe5be73886f383639fe0850bb72d5b568a7b9 git Not specified
CNA Linux Linux affected 84c61fe1a75b4255df1e1e7c054c9e6d048da417 208640e6225cc929a05adbf79d1df558add3e231 git Not specified
CNA Linux Linux affected 84c61fe1a75b4255df1e1e7c054c9e6d048da417 61ca2da5fb8f433ce8bbd1657c84a86272133e6b git Not specified
CNA Linux Linux affected 84c61fe1a75b4255df1e1e7c054c9e6d048da417 0aeb54ac4cd5cf8f60131b4d9ec0b6dc9c27b20d git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.1.154 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.108 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.49 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.9 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/61ca2da5fb8f433ce8bbd1657c84a86272133e6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4cefe5be73886f383639fe0850bb72d5b568a7b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/208640e6225cc929a05adbf79d1df558add3e231 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b36462146d86b1f22e594fe4dae611dffacfb203 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0aeb54ac4cd5cf8f60131b4d9ec0b6dc9c27b20d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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