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CVE-2026-74492— netfilter: ipset: do not update comments from kernel-side hash adds

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.6版本存在安全漏洞，该漏洞源于netfilter ipset的mtype_resize()使用memcpy复制注释指针而非注释对象，可能导致释放后重用。

CVSS 8.4 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux f66ee0410b1c3481ee75e5db9b34547b4d582465< 6f13f4d52d06986c18f12e8bffaab944dd27ceab affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< f9d6cabff1fca010562dcdb0d22b296bdca3ba5a affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< 661ff9c0cfbe07f8eed920dde9f7781491738207 affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< c710e9bf38e4e71a8db85d26a0f70c0674664207 affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< 4ae701848e4ba9e9713375fb7d82218cbd309da2 affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< 77dbb248a5cc7a5270cd37bbb0b635bf059a872a affected
f66ee0410b1c3481ee75e5db9b34547b4d582465< f30415929be8aeb002d557c8d3f7ab2d2188003a affected
… +14 more rows
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I. Basic Information for CVE-2026-74492

Vulnerability Information
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Vulnerability Title
netfilter: ipset: do not update comments from kernel-side hash adds
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.6版本存在安全漏洞，该漏洞源于netfilter ipset的mtype_resize()使用memcpy复制注释指针而非注释对象，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f66ee0410b1c3481ee75e5db9b34547b4d582465 ~ 6f13f4d52d06986c18f12e8bffaab944dd27ceab -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-74492

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III. Intelligence Information for CVE-2026-74492

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Patches & Fixes for CVE-2026-74492 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74492

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