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ReviewHigh

CVE-2026-74748

Linux

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix refcount race between list:set GC and swap __ip_set_put_byindex() resolved the index to a set pointer under RCU, then took ip_set_ref_lock in __ip_set_put() to decrement set->ref. ip_set_swap() holds that same lock while swapping both the ip_set_list slots and the two sets' ref counters, so it can interleave between the dereference and the lock acquisition, leaving the caller to decrement a set whose reference already moved to the other index and hit BUG_ON(set->ref == 0). list_set_gc() reaches this fr...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

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 refcount race between list:set GC and swap __ip_set_put_byindex() resolved the index to a set pointer under RCU, then took ip_set_ref_lock in __ip_set_put() to decrement set->ref. ip_set_swap() holds that same lock while swapping both the ip_set_list slots and the two sets' ref counters, so it can interleave between the dereference and the lock acquisition, leaving the caller to decrement a set whose reference already moved to the other index and hit BUG_ON(set->ref == 0). list_set_gc() reaches this fr...

Affected product and versions

Product
Linux
Affected versions
>= 9076aea76538556224e7d73ab718f8841330818a < 97a01de0c6321b7210d30d0a4d60f10f561097c7, >= 9076aea76538556224e7d73ab718f8841330818a < c21afc7c216a4d257a4f3f300e0791890bc846b9, >= 9076aea76538556224e7d73ab718f8841330818a < b0aab9dd1a348b99d75ff52765719d0cc2050630, >= 9076aea76538556224e7d73ab718f8841330818a < b891e7a6bb06e0f6560e5932665ac660acd12225, >= 9076aea76538556224e7d73ab718f8841330818a < 20cb13a523f0a05cb2d0a7d72abae687683712e0, >= 9076aea76538556224e7d73ab718f8841330818a < cb20da33839f28f590c99f16bafaa6151451c0e8, >= 9076aea76538556224e7d73ab718f8841330818a < 24ffcb1e1688c55fd2a505f064295cd28eac546d, >= 9076aea76538556224e7d73ab718f8841330818a < 0c88868271653537ed443272dd8e7d13634d214b, >= 3.8
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