tcp: secure_seq: add back ports to TS offset
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.
CVE-2026-23247
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23247
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
"lessThan": "e873e8c16b2fb743a381a9e59c108e63512301ec",
"versionType": "git"
},
{
"status": "affected",
"version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
"lessThan": "5da5662181ef8a251e3ba564903002c2e87de452",
"versionType": "git"
},
{
"status": "affected",
"version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
"lessThan": "eae2f14ab2efccdb7480fae7d42c4b0116ef8805",
"versionType": "git"
},
{
"status": "affected",
"version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
"lessThan": "46e5b0d7cf55821527adea471ffe52a5afbd9caf",
"versionType": "git"
},
{
"status": "affected",
"version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
"lessThan": "165573e41f2f66ef98940cf65f838b2cb575d9d1",
"versionType": "git"
},
{
"status": "affected",
"version": "443fac9f2618b93cbc5ab068dc594530236b3a23",
"versionType": "git"
},
{
"status": "affected",
"version": "4.10.14",
"lessThan": "4.11",
"versionType": "semver"
}
],
"programFiles": [
"include/net/secure_seq.h",
"include/net/tcp.h",
"net/core/secure_seq.c",
"net/ipv4/syncookies.c",
"net/ipv4/tcp_input.c",
"net/ipv4/tcp_ipv4.c",
"net/ipv6/syncookies.c",
"net/ipv6/tcp_ipv6.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/secure_seq.h",
"include/net/tcp.h",
"net/core/secure_seq.c",
"net/ipv4/syncookies.c",
"net/ipv4/tcp_input.c",
"net/ipv4/tcp_ipv4.c",
"net/ipv6/syncookies.c",
"net/ipv6/tcp_ipv6.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23247
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46116 · Revision 1
- Added to Heist Feed
- Publisher date