CVE-2026-74492High· 8.4▾ TwilightIn 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 th…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 46.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < 6f13f4d52d06986c18f12e8bffaab944dd27ceabLinux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < f9d6cabff1fca010562dcdb0d22b296bdca3ba5aLinux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042aLinux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < 661ff9c0cfbe07f8eed920dde9f7781491738207Linux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < c710e9bf38e4e71a8db85d26a0f70c0674664207Linux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < 4ae701848e4ba9e9713375fb7d82218cbd309da2Linux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < 77dbb248a5cc7a5270cd37bbb0b635bf059a872aLinux >= f66ee0410b1c3481ee75e5db9b34547b4d582465 < f30415929be8aeb002d557c8d3f7ab2d2188003aLinux 5dd9488ae41070b69d2f4acb580f77db5705f9caLinux a469bab3386aebff33c59506f3a95e35b91118fdLinux >= 5.4.24 < 5.5Linux >= 5.5.8 < 5.6Linux 5.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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