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.

CVSS 3.1

7.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

Published

2026-08-15

Modified

2026-10-16

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc
• https://git.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63
• https://git.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eec
• https://git.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0
• https://git.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9d

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