Answer in brief
CVE-2026-72347 records a High severity (CVSS 7.3) vulnerability in netfilter: xt_connmark: reject invalid shift parameters. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=472a73e00757b971d613d796374d2727b2e4954d <d8ce63d928b457fba7ed1e302492dfd32293671c || >=472a73e00757b971d613d796374d2727b2e4954d <9657bb11a6376ab0a79f05d433713d6944111e9d || >=472a73e00757b971d613d796374d2727b2e4954d <8ace320ac4416f5e5fbcd065309fb2dfcce787b0 || >=472a73e00757b971d613d796374d2727b2e4954d <c3fa852d117b3fda72265e4230e3967db4a74fcf || >=472a73e00757b971d613d796374d2727b2e4954d <4eef84b09a3836919360c4232b0f16651a155eec || >=472a73e00757b971d613d796374d2727b2e4954d <230173cc6105bdfb2696d37e6e56687b003fbe63 || >=472a73e00757b971d613d796374d2727b2e4954d <1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc | d8ce63d928b457fba7ed1e302492dfd32293671c, 9657bb11a6376ab0a79f05d433713d6944111e9d, 8ace320ac4416f5e5fbcd065309fb2dfcce787b0, c3fa852d117b3fda72265e4230e3967db4a74fcf, 4eef84b09a3836919360c4232b0f16651a155eec, 230173cc6105bdfb2696d37e6e56687b003fbe63, 1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc |
| Linux/Linuxgeneric | 4.17 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.