7.5
HIGH CVSS 3.1
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
Affected Products

The following products are affected by CVE-2026-72253 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
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
Update the Linux kernel to resolve an issue with the SIP conntrack helper.
  • Apply the Linux kernel patch.
  • Update the Linux kernel.
  • Recompile the Linux kernel if necessary.
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
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.