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CVE-2026-72436— netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

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 4.2版本存在安全漏洞，该漏洞源于netfilter ipset在哈希类型的无锁RCU读取器中使用了test_bit()函数，该函数为宽松原子操作且不提供内存屏障保证，与添加、删除或垃圾回收操作并行时可能导致内存序问题。

CVSS 9.8 · Critical EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 18f84d41d34fa35d0d64bbaea01fe664553ecc06< c107233d2ff4fd7cef5d02f9124b99194957a710 affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06< 6329d3a9afe715fddda0460cfa46b496d61c2fe0 affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06< 7445fe965b7d8756070a40e80f8b73348ccda1d7 affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06< c4d257734e91bfcdc71d41843392dd6400b5bb1b affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06< 3219d74e4536658c937fd878a327257b86ce80dd affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06< e4b4984e28c16406ecb318444dea4a8bf47def3e affected
4.2 affected
< 4.2 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-72436

Vulnerability Information
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Vulnerability Title
netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 4.2版本存在安全漏洞，该漏洞源于netfilter ipset在哈希类型的无锁RCU读取器中使用了test_bit()函数，该函数为宽松原子操作且不提供内存屏障保证，与添加、删除或垃圾回收操作并行时可能导致内存序问题。
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 18f84d41d34fa35d0d64bbaea01fe664553ecc06 ~ c107233d2ff4fd7cef5d02f9124b99194957a710 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-72436

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III. Intelligence Information for CVE-2026-72436

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Patches & Fixes for CVE-2026-72436 (6)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - 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-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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-2026-74309 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-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72436

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