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CVE-2026-72347

HIGHCVSS 7.3/10EPSS 0.21%

Last modified

CVE-2026-72347 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift parameters and applies them to 32-bit mark values in connmark_tg_shift(). A shift_bits value of 32 or more triggers an undefined-shift bug when the rule is evaluated. Invalid shift_dir values are also accepted and silently fall back to the left-shift path. Reject invalid revision-2 shift parameters in connmark_tg_check() so malformed rules fail at installation time, before they can reach the packet path.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift parameters and applies them to 32-bit mark values in connmark_tg_shift(). A shift_bits value of 32 or more triggers an undefined-shift bug when the rule is evaluated. Invalid shift_dir values are also accepted and silently fall back to the left-shift path. Reject invalid revision-2 shift parameters in connmark_tg_check() so malformed rules fail at installation time, before they can reach the packet path.

Metrics

CVSS 3.1
7.3/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

EPSS Probability
0.21%

12.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 472a73e00757b971d613d796374d2727b2e4954d, < d8ce63d928b457fba7ed1e302492dfd32293671c; >= 472a73e00757b971d613d796374d2727b2e4954d, < 9657bb11a6376ab0a79f05d433713d6944111e9d; >= 472a73e00757b971d613d796374d2727b2e4954d, < 8ace320ac4416f5e5fbcd065309fb2dfcce787b0; >= 472a73e00757b971d613d796374d2727b2e4954d, < c3fa852d117b3fda72265e4230e3967db4a74fcf; >= 472a73e00757b971d613d796374d2727b2e4954d, < 4eef84b09a3836919360c4232b0f16651a155eec; >= 472a73e00757b971d613d796374d2727b2e4954d, < 230173cc6105bdfb2696d37e6e56687b003fbe63; >= 472a73e00757b971d613d796374d2727b2e4954d, < 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc
LinuxLinux4.17

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72347?
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift parameters and applies them to 32-bit mark values in connmark_tg_shift(). A shift_bits value of 32 or more triggers an undefined-shift bug when the rule is evaluated. Invalid shift_dir values are also accepted and silently fall back to the left-shift path. Reject invalid revision-2 shift parameters in connmark_tg_check() so malformed rules fail at installation time, before they can reach the packet path.
How severe is CVE-2026-72347?
CVE-2026-72347 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72347?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST