tcp: secure_seq: add back ports to TS offset

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Summary

CVECVE-2026-23247
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-18 11:16:16 UTC
Updated2026-05-21 17:35:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tcp: secure_seq: add back ports to TS offset This reverts 28ee1b746f49 ("secure_seq: downgrade to per-host timestamp offsets") tcp_tw_recycle went away in 2017. Zhouyan Deng reported off-path TCP source port leakage via SYN cookie side-channel that can be fixed in multiple ways. One of them is to bring back TCP ports in TS offset randomization. As a bonus, we perform a single siphash() computation to provide both an ISN and a TS offset.

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

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 28ee1b746f493b7c62347d714f58fbf4f70df4f0 eae2f14ab2efccdb7480fae7d42c4b0116ef8805 git Not specified
CNA Linux Linux affected 28ee1b746f493b7c62347d714f58fbf4f70df4f0 46e5b0d7cf55821527adea471ffe52a5afbd9caf git Not specified
CNA Linux Linux affected 28ee1b746f493b7c62347d714f58fbf4f70df4f0 165573e41f2f66ef98940cf65f838b2cb575d9d1 git Not specified
CNA Linux Linux affected 443fac9f2618b93cbc5ab068dc594530236b3a23 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.18.17 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.7 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9caf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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