Answer in brief
CVE-2026-74492 records a Unknown severity vulnerability in netfilter: ipset: do not update comments from kernel-side hash adds. 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 | >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <661ff9c0cfbe07f8eed920dde9f7781491738207 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <c710e9bf38e4e71a8db85d26a0f70c0674664207 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <4ae701848e4ba9e9713375fb7d82218cbd309da2 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <77dbb248a5cc7a5270cd37bbb0b635bf059a872a || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <f30415929be8aeb002d557c8d3f7ab2d2188003a || 5dd9488ae41070b69d2f4acb580f77db5705f9ca || a469bab3386aebff33c59506f3a95e35b91118fd || >=5.4.24 <5.5 || >=5.5.8 <5.6 | 661ff9c0cfbe07f8eed920dde9f7781491738207, c710e9bf38e4e71a8db85d26a0f70c0674664207, 4ae701848e4ba9e9713375fb7d82218cbd309da2, 77dbb248a5cc7a5270cd37bbb0b635bf059a872a, f30415929be8aeb002d557c8d3f7ab2d2188003a, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | 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: ipset: do not update comments from kernel-side hash adds mtype_resize() copies comment pointers with memcpy(), not the comment objects themselves. During the window after an entry has been copied but before the table swap and backlog replay, the old table is still published for packet-side updates while the replacement-table entry already holds the same ip_set_comment_rcu pointer. If xt_SET --add-set ... --exist hits that old entry in this window, mtype_add() calls ip_set_init_comment() even though packet-side adds carry no comment payload. That call frees the shared comment through the old entry, so the replacement-table entry now holds a stale pointer. When the queued add is replayed on the new table, mtype_add() calls ip_set_init_comment() again and strlen() dereferences the stale pointer. Fix this in mtype_add() by skipping ip_set_init_comment() when ext->target marks a packet-side add. Userspace adds still update comments, while packet-side adds can no longer free comment storage shared with a resize copy.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74492 records a Unknown severity vulnerability in netfilter: ipset: do not update comments from kernel-side hash adds. 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 | >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <661ff9c0cfbe07f8eed920dde9f7781491738207 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <c710e9bf38e4e71a8db85d26a0f70c0674664207 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <4ae701848e4ba9e9713375fb7d82218cbd309da2 || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <77dbb248a5cc7a5270cd37bbb0b635bf059a872a || >=f66ee0410b1c3481ee75e5db9b34547b4d582465 <f30415929be8aeb002d557c8d3f7ab2d2188003a || 5dd9488ae41070b69d2f4acb580f77db5705f9ca || a469bab3386aebff33c59506f3a95e35b91118fd || >=5.4.24 <5.5 || >=5.5.8 <5.6 | 661ff9c0cfbe07f8eed920dde9f7781491738207, c710e9bf38e4e71a8db85d26a0f70c0674664207, 4ae701848e4ba9e9713375fb7d82218cbd309da2, 77dbb248a5cc7a5270cd37bbb0b635bf059a872a, f30415929be8aeb002d557c8d3f7ab2d2188003a, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | 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: ipset: do not update comments from kernel-side hash adds mtype_resize() copies comment pointers with memcpy(), not the comment objects themselves. During the window after an entry has been copied but before the table swap and backlog replay, the old table is still published for packet-side updates while the replacement-table entry already holds the same ip_set_comment_rcu pointer. If xt_SET --add-set ... --exist hits that old entry in this window, mtype_add() calls ip_set_init_comment() even though packet-side adds carry no comment payload. That call frees the shared comment through the old entry, so the replacement-table entry now holds a stale pointer. When the queued add is replayed on the new table, mtype_add() calls ip_set_init_comment() again and strlen() dereferences the stale pointer. Fix this in mtype_add() by skipping ip_set_init_comment() when ext->target marks a packet-side add. Userspace adds still update comments, while packet-side adds can no longer free comment storage shared with a resize copy.
Quoted source text, attributed separately from HOL analysis.