CVE-2026-72347

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < d8ce63d928b457fba7ed1e302492dfd32293671caffected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < 9657bb11a6376ab0a79f05d433713d6944111e9daffected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < 8ace320ac4416f5e5fbcd065309fb2dfcce787b0affected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < c3fa852d117b3fda72265e4230e3967db4a74fcfaffected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < 4eef84b09a3836919360c4232b0f16651a155eecaffected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < 230173cc6105bdfb2696d37e6e56687b003fbe63affected
LinuxLinux472a73e00757b971d613d796374d2727b2e4954d < 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebcaffected
LinuxLinux4.17affected
LinuxLinux0 < 4.17unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References