CVE-2026-23247
- Source
- https://cve.org/CVERecord?id=CVE-2026-23247
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23247.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-23247
- Downstream
AZL (1)
BELL (1)
DEBIAN (1)
ECHO (1)
ROOT (5)
UBUNTU (1)
- Published
- 2026-03-18T10:05:09Z
- Modified
- 2026-10-08T02:50:39Z
- Summary
- tcp: secure_seq: add back ports to TS offset
- Details
-
In 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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23247.json" }- References
-
- https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1
- https://git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9caf
- https://git.kernel.org/stable/c/5da5662181ef8a251e3ba564903002c2e87de452
- https://git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23247.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-23247
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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
-
Introduced28ee1b746f493b7c62347d714f58fbf4f70df4f0Fixed5da5662181ef8a251e3ba564903002c2e87de452Fixedeae2f14ab2efccdb7480fae7d42c4b0116ef8805Fixed46e5b0d7cf55821527adea471ffe52a5afbd9cafFixed165573e41f2f66ef98940cf65f838b2cb575d9d1
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4.10.14Fixed4.11
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced443fac9f2618b93cbc5ab068dc594530236b3a23