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8.2
HIGH CVSS 3.1
CVE-2026-72021
ipvs: use parsed transport offset in SCTP state lookup
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport offset in SCTP state lookup set_sctp_state() reads the SCTP chunk header again in order to drive the IPVS SCTP state table. For IPv6 it computes the offset with sizeof(struct ipv6hdr), while the surrounding IPVS code uses iph.len from ip_vs_fill_iph_skb(), where ipv6_find_hdr() has already skipped extension headers and found the real transport header. This makes the state machine read from the wrong offset for IPv6 SCTP packets that carry extension headers. For example, an INIT packet with an 8-byte destination options header can be scheduled correctly by sctp_conn_schedule(), but set_sctp_state() reads the first byte of the SCTP verification tag as a DATA chunk type. The connection then moves from NONE to ESTABLISHED instead of INIT1, gets the longer established timeout, and updates the active/inactive destination counters incorrectly. This happens even though the SCTP handshake has not completed. Use the parsed transport offset passed down from ip_vs_set_state() for the SCTP chunk-header lookup. For IPv4 and IPv6 packets without extension headers this preserves the existing offset.

Details
INFO

Published Date :

Aug. 15, 2026, 6:21 a.m.

Last Modified :

Aug. 17, 2026, 6:17 a.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72021 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Correctly use parsed transport offset in SCTP state lookup to prevent incorrect state transitions.
  • Apply the Linux kernel patch for the ipvs module.
  • Ensure transport offset is correctly parsed for SCTP state lookups.
  • Verify SCTP state transitions after applying the fix.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72021.

URL Resource
https://git.kernel.org/stable/c/247d055504dcc852e539b9f7f30d19f9741474bf
https://git.kernel.org/stable/c/290e9e8389b556efc603522e28bd1543846aa336
https://git.kernel.org/stable/c/2f75c0faa3361b28e36cc0512b3299e163e25789
https://git.kernel.org/stable/c/9cb5ac594ca76d3a71803b23b74c835b0721e628
https://git.kernel.org/stable/c/9f94573ab962a9e81954b755da016fa3cd2f5039
https://git.kernel.org/stable/c/a4a2d2e483d79cc2ad3a170674cf159644acf22b
https://git.kernel.org/stable/c/d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27
https://git.kernel.org/stable/c/e5d0bb8871668f20de8f3c94b5ae3f372346bc6e
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72021 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72021 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72021 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72021 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'd2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9f94573ab962a9e81954b755da016fa3cd2f5039', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '290e9e8389b556efc603522e28bd1543846aa336', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9cb5ac594ca76d3a71803b23b74c835b0721e628', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'a4a2d2e483d79cc2ad3a170674cf159644acf22b', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '247d055504dcc852e539b9f7f30d19f9741474bf', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'e5d0bb8871668f20de8f3c94b5ae3f372346bc6e', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '2f75c0faa3361b28e36cc0512b3299e163e25789', 'versionType': 'git'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'd2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9f94573ab962a9e81954b755da016fa3cd2f5039', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '290e9e8389b556efc603522e28bd1543846aa336', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9cb5ac594ca76d3a71803b23b74c835b0721e628', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'a4a2d2e483d79cc2ad3a170674cf159644acf22b', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '247d055504dcc852e539b9f7f30d19f9741474bf', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'e5d0bb8871668f20de8f3c94b5ae3f372346bc6e', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '2f75c0faa3361b28e36cc0512b3299e163e25789', 'versionType': 'git'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'd2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9f94573ab962a9e81954b755da016fa3cd2f5039', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '290e9e8389b556efc603522e28bd1543846aa336', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '9cb5ac594ca76d3a71803b23b74c835b0721e628', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'a4a2d2e483d79cc2ad3a170674cf159644acf22b', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '247d055504dcc852e539b9f7f30d19f9741474bf', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': 'e5d0bb8871668f20de8f3c94b5ae3f372346bc6e', 'versionType': 'git'}, {'status': 'affected', 'version': '2906f66a5682e5670a5eefe991843689b8d8563f', 'lessThan': '2f75c0faa3361b28e36cc0512b3299e163e25789', 'versionType': 'git'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/ipvs/ip_vs_proto_sctp.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport offset in SCTP state lookup set_sctp_state() reads the SCTP chunk header again in order to drive the IPVS SCTP state table. For IPv6 it computes the offset with sizeof(struct ipv6hdr), while the surrounding IPVS code uses iph.len from ip_vs_fill_iph_skb(), where ipv6_find_hdr() has already skipped extension headers and found the real transport header. This makes the state machine read from the wrong offset for IPv6 SCTP packets that carry extension headers. For example, an INIT packet with an 8-byte destination options header can be scheduled correctly by sctp_conn_schedule(), but set_sctp_state() reads the first byte of the SCTP verification tag as a DATA chunk type. The connection then moves from NONE to ESTABLISHED instead of INIT1, gets the longer established timeout, and updates the active/inactive destination counters incorrectly. This happens even though the SCTP handshake has not completed. Use the parsed transport offset passed down from ip_vs_set_state() for the SCTP chunk-header lookup. For IPv4 and IPv6 packets without extension headers this preserves the existing offset.
    Added Reference https://git.kernel.org/stable/c/247d055504dcc852e539b9f7f30d19f9741474bf
    Added Reference https://git.kernel.org/stable/c/290e9e8389b556efc603522e28bd1543846aa336
    Added Reference https://git.kernel.org/stable/c/2f75c0faa3361b28e36cc0512b3299e163e25789
    Added Reference https://git.kernel.org/stable/c/9cb5ac594ca76d3a71803b23b74c835b0721e628
    Added Reference https://git.kernel.org/stable/c/9f94573ab962a9e81954b755da016fa3cd2f5039
    Added Reference https://git.kernel.org/stable/c/a4a2d2e483d79cc2ad3a170674cf159644acf22b
    Added Reference https://git.kernel.org/stable/c/d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27
    Added Reference https://git.kernel.org/stable/c/e5d0bb8871668f20de8f3c94b5ae3f372346bc6e
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.2
Attack Vector
Attack Complexity
Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact