Answer in brief
CVE-2026-72347 records a Unknown severity 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.
Answer in brief
CVE-2026-72347 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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 15, 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.
A CVSS score is not reported in the current record. 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 15, 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.