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CVE-2026-23247— tcp: secure_seq: add back ports to TS offset

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于secure_seq函数中未将端口纳入时间戳偏移随机化，可能导致TCP源端口泄露。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 28ee1b746f493b7c62347d714f58fbf4f70df4f0< 5da5662181ef8a251e3ba564903002c2e87de452 affected
28ee1b746f493b7c62347d714f58fbf4f70df4f0< eae2f14ab2efccdb7480fae7d42c4b0116ef8805 affected
28ee1b746f493b7c62347d714f58fbf4f70df4f0< 46e5b0d7cf55821527adea471ffe52a5afbd9caf affected
28ee1b746f493b7c62347d714f58fbf4f70df4f0< 165573e41f2f66ef98940cf65f838b2cb575d9d1 affected
443fac9f2618b93cbc5ab068dc594530236b3a23 affected
4.10.14< 4.11 affected
4.11 affected
< 4.11 unaffected
… +4 more rows
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I. Basic Information for CVE-2026-23247

Vulnerability Information
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Vulnerability Title
tcp: secure_seq: add back ports to TS offset
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于secure_seq函数中未将端口纳入时间戳偏移随机化，可能导致TCP源端口泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 28ee1b746f493b7c62347d714f58fbf4f70df4f0 ~ 5da5662181ef8a251e3ba564903002c2e87de452 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-23247

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III. Intelligence Information for CVE-2026-23247

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Patches & Fixes for CVE-2026-23247 (4)

Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23270 7.8 HIGH net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
CVE-2026-23253 7.8 HIGH media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2026-23245 7.8 HIGH net/sched: act_gate: snapshot parameters with RCU on replace
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2026-23269 7.1 HIGH apparmor: validate DFA start states are in bounds in unpack_pdb
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23249 xfs: check for deleted cursors when revalidating two btrees
CVE-2026-23250 xfs: check return value of xchk_scrub_create_subord
CVE-2026-23251 xfs: only call xf{array,blob}_destroy if we have a valid pointer
CVE-2026-23252 xfs: get rid of the xchk_xfile_*_descr calls
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71270 LoongArch: Enable exception fixup for specific ADE subcode

Showing top 20 of 35 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23247

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