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Review reviewHigh

CVE-2026-64189

Linux

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, synchroni...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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, synchroni...

Affected product and versions

Product
Linux
Affected versions
>= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < a7a299277959683204d73333c32c092fd69327d4, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < 96fbafc20ebd9a613736c2998b89c539fe3042f5, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < ff86ea9b7fdf70564e60436fbee68c96bc459943, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < 81d54c766337b923eec26da0a13406760b091093, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < e8ee198bbc04a32d336e79160fde980e0235b39f, >= 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 < 7cd9103283b26b917360ec99d7d2f2d761bcf1ab, >= 2f6bf7917f55f9dae913193e49672b3598620eab, >= 4.19.5 < 4.20, >= 4.20
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available