CVE-2026-72347
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.
How to fix
- Linux Linuxd8ce63d928b457fba7ed1e302492dfd32293671c, 9657bb11a6376ab0a79f05d433713d6944111e9d, 8ace320ac4416f5e5fbcd065309fb2dfcce787b0, c3fa852d117b3fda72265e4230e3967db4a74fcf, 4eef84b09a3836919360c4232b0f16651a155eec, 230173cc6105bdfb2696d37e6e56687b003fbe63, 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 472a73e00757b971d613d796374d2727b2e4954d ≤ v < d8ce63d928b457fba7ed1e302492dfd32293671c, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < 9657bb11a6376ab0a79f05d433713d6944111e9d, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < 8ace320ac4416f5e5fbcd065309fb2dfcce787b0, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < c3fa852d117b3fda72265e4230e3967db4a74fcf, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < 4eef84b09a3836919360c4232b0f16651a155eec, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < 230173cc6105bdfb2696d37e6e56687b003fbe63, 472a73e00757b971d613d796374d2727b2e4954d ≤ v < 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc, 4.17 | d8ce63d928b457fba7ed1e302492dfd32293671c, 9657bb11a6376ab0a79f05d433713d6944111e9d, 8ace320ac4416f5e5fbcd065309fb2dfcce787b0, c3fa852d117b3fda72265e4230e3967db4a74fcf, 4eef84b09a3836919360c4232b0f16651a155eec, 230173cc6105bdfb2696d37e6e56687b003fbe63, 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc |
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