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NVD / CVE Program· CNA Linux

CVE-2026-64189: netfilter: ipset: fix race between dump and ip_set_list resize

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e, 4.20, 7cd9103283b26b917360ec99d7d2f2d761bcf1ab; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e, 4.20, 7cd9103283b26b917360ec99d7d2f2d761bcf1ab; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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: fix race between dump and ip_set_list resize The release path of ip_set_dump_do() and ip_set_dump_done() read inst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw() of the array pointer. These run from netlink_recvmsg() without the nfnl mutex and without an RCU read-side critical section. A concurrent ip_set_create() can grow the array: it publishes the new array, calls synchronize_net() and then kvfree()s the old one. Since the dump paths read the array outside any RCU reader, synchronize_net() does not wait for them and the old array can be freed while they still index into it, causing a use-after-free. The dumped set itself stays pinned via set->ref_netlink, so only the array load needs protecting. Take rcu_read_lock() around it, matching ip_set_get_byname() and __ip_set_put_byindex(). BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) Read of size 8 at addr ffff88800b5c4018 by task exploit/150 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) netlink_dump (net/netlink/af_netlink.c:2325) netlink_recvmsg (net/netlink/af_netlink.c:1976) sock_recvmsg (net/socket.c:1159) __sys_recvfrom (net/socket.c:2315) ... Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7] RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698) Kernel panic - not syncing: Fatal exception

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 20, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 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
7.8
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.

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  • 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 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.19.5 and later · before 4.20
  • linux linux kernel4.20.1 and later · before 5.10.261
  • linux linux kernel5.11 and later · before 5.15.212
  • linux linux kernel5.16 and later · before 6.1.178
  • linux linux kernel6.2 and later · before 6.6.145
  • linux linux kernel6.7 and later · before 6.12.96
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4
  • linux linux kernel4.20
  • linux linux kernel7.2

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

    • 2f6bf7917f55f9dae913193e49672b3598620eab, 4.20affected
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before a7a299277959683204d73333c32c092fd69327d4affected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before 1bc67c3fc98e9fc07032cc56afcdbc690c47d11eaffected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710affected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before 96fbafc20ebd9a613736c2998b89c539fe3042f5affected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before ff86ea9b7fdf70564e60436fbee68c96bc459943affected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before 81d54c766337b923eec26da0a13406760b091093affected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before e8ee198bbc04a32d336e79160fde980e0235b39faffected · git
    • 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 and later · before 7cd9103283b26b917360ec99d7d2f2d761bcf1abaffected · git
    • 4.19.5 and later · before 4.20affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.158.1.el8_104.18.0-553.158.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.158.1.rt7.499.el8_104.18.0-553.158.1.rt7.499.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64205Jul 20, 2026 · i2c: i801: fix hardware state machine corruption in error path
    22Monitor
  • ← EarlierCVE-2026-64207Jul 20, 2026 · net/sched: dualpi2: fix GSO backlog accounting
    22Monitor
  • Later →CVE-2026-64190Jul 20, 2026 · net: team: fix NULL pointer dereference in team_xmit during mode change
    22Monitor

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 Linux1bc67c3fc98e9fc07032cc56afcdbc690c47d11eVendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux7cd9103283b26b917360ec99d7d2f2d761bcf1abVendor (CNA)
Linux Linux81d54c766337b923eec26da0a13406760b091093Vendor (CNA)
Linux Linux96fbafc20ebd9a613736c2998b89c539fe3042f5Vendor (CNA)
Linux Linuxa7a299277959683204d73333c32c092fd69327d4Vendor (CNA)
Linux Linuxe8a9976b61f1bc4aa7fd25fa26726dfdf2adf710Vendor (CNA)
Linux Linuxe8ee198bbc04a32d336e79160fde980e0235b39fVendor (CNA)
Linux Linuxff86ea9b7fdf70564e60436fbee68c96bc459943Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.06.6.145.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.1.7-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+33

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.
  • A low-privileged account is enough.
  • 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
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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.

ATT&CK techniques

—

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