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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 33/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a, 4ae701848e4ba9e9713375fb7d82218cbd309da2, 5.5; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a, 4ae701848e4ba9e9713375fb7d82218cbd309da2, 5.5; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.4 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.4
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5dd9488ae41070b69d2f4acb580f77db5705f9ca, a469bab3386aebff33c59506f3a95e35b91118fd, 5.6affected
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before 6f13f4d52d06986c18f12e8bffaab944dd27ceabaffected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before f9d6cabff1fca010562dcdb0d22b296bdca3ba5aaffected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042aaffected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before 661ff9c0cfbe07f8eed920dde9f7781491738207affected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before c710e9bf38e4e71a8db85d26a0f70c0674664207affected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before 4ae701848e4ba9e9713375fb7d82218cbd309da2affected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before 77dbb248a5cc7a5270cd37bbb0b635bf059a872aaffected · git
    • f66ee0410b1c3481ee75e5db9b34547b4d582465 and later · before f30415929be8aeb002d557c8d3f7ab2d2188003aaffected · git
    • 5.4.24 and later · before 5.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74489Aug 15, 2026 · wifi: mac80211: fix tid_tx use-after-free on BA session stop
    35Monitor
  • ← EarlierCVE-2026-74490Aug 15, 2026 · tipc: avoid use-after-free in poll trace queue dumps
    35Monitor
  • Later →CVE-2026-74493Aug 15, 2026 · net/smc: fix socket use-after-free during link group termination
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux16bfa7be2d76ca1e0aacfa363482e1bf8ab5042aVendor (CNA)
Linux Linux4ae701848e4ba9e9713375fb7d82218cbd309da2Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5.6Vendor (CNA)
Linux Linux661ff9c0cfbe07f8eed920dde9f7781491738207Vendor (CNA)
Linux Linux6f13f4d52d06986c18f12e8bffaab944dd27ceabVendor (CNA)
Linux Linux77dbb248a5cc7a5270cd37bbb0b635bf059a872aVendor (CNA)
Linux Linuxc710e9bf38e4e71a8db85d26a0f70c0674664207Vendor (CNA)
Linux Linuxf30415929be8aeb002d557c8d3f7ab2d2188003aVendor (CNA)
Linux Linuxf9d6cabff1fca010562dcdb0d22b296bdca3ba5aVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records