CVE-2026-72253
netfilter: nf_conntrack_sip: validate skb_dst() before accessing it
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.
INFO
Published Date :
Aug. 15, 2026, 6:21 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the Linux kernel patch.
- Update the Linux kernel.
- Recompile the Linux kernel if necessary.
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-2026-72253.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72253 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-2026-72253
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-2026-72253 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72253 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:N/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': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e64a48c50a1ff565a98c6a98d82b5b942868e76e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'c199ed687c00841daf60e9d131976958583a8c09', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': '09755dc62b026076b1d47f83489eb0547c8135e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'b843a96252f672332837ea2ecb7c8db0acf68e20', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e5e24a365a5e024efef63cc49abb345fbd4852c5', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nf_conntrack_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nf_conntrack_sip.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e64a48c50a1ff565a98c6a98d82b5b942868e76e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'c199ed687c00841daf60e9d131976958583a8c09', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': '09755dc62b026076b1d47f83489eb0547c8135e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'b843a96252f672332837ea2ecb7c8db0acf68e20', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e5e24a365a5e024efef63cc49abb345fbd4852c5', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nf_conntrack_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', '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/nf_conntrack_sip.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': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e64a48c50a1ff565a98c6a98d82b5b942868e76e', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'c199ed687c00841daf60e9d131976958583a8c09', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': '09755dc62b026076b1d47f83489eb0547c8135e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'b843a96252f672332837ea2ecb7c8db0acf68e20', 'versionType': 'git'}, {'status': 'affected', 'version': 'cae3a2627520c3795b54533c5328b77af3405dbe', 'lessThan': 'e5e24a365a5e024efef63cc49abb345fbd4852c5', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nf_conntrack_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nf_conntrack_sip.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash. Added Reference https://git.kernel.org/stable/c/09755dc62b026076b1d47f83489eb0547c8135e0 Added Reference https://git.kernel.org/stable/c/b843a96252f672332837ea2ecb7c8db0acf68e20 Added Reference https://git.kernel.org/stable/c/c199ed687c00841daf60e9d131976958583a8c09 Added Reference https://git.kernel.org/stable/c/e5e24a365a5e024efef63cc49abb345fbd4852c5 Added Reference https://git.kernel.org/stable/c/e64a48c50a1ff565a98c6a98d82b5b942868e76e