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CVE-2026-72243— selinux: check connect-related permissions on TCP Fast Open

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 6.1.178之前版本、6.6.145之前版本、6.12.97之前版本、6.18.40之前版本和7.1.5之前版本存在安全漏洞，该漏洞源于SELinux在引入TCP Fast Open支持时未检查连接相关权限，可能导致权限绕过。

CVSS 8.4 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1562

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux cf60af03ca4e71134206809ea892e49b92a88896< 11406d0d7e11b4e525bb2ace2c70107031d058da affected
cf60af03ca4e71134206809ea892e49b92a88896< e507633bf76bccf1a6af27771fb0d6e2862b7eac affected
cf60af03ca4e71134206809ea892e49b92a88896< d028bc080a0dcd6a7f8e1ae1bd32dda696505ba3 affected
cf60af03ca4e71134206809ea892e49b92a88896< fc633a598206d4f23af782db7c0b5f3a82751d2c affected
cf60af03ca4e71134206809ea892e49b92a88896< 646ebbc5f2ff9147d084e1213143f091026a611c affected
cf60af03ca4e71134206809ea892e49b92a88896< 44c74d27d1b9aaa99fa8a83640c1223575262b80 affected
3.6 affected
< 3.6 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-72243

Vulnerability Information
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Vulnerability Title
selinux: check connect-related permissions on TCP Fast Open
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: selinux: check connect-related permissions on TCP Fast Open Similar to Landlock, SELinux was not updated when TCP Fast Open support was introduced to ensure connect-related permissions are checked when using TCP Fast Open. Update its socket_sendmsg() hook to call selinux_socket_connect() when MSG_FASTOPEN is passed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
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 6.1.178之前版本、6.6.145之前版本、6.12.97之前版本、6.18.40之前版本和7.1.5之前版本存在安全漏洞，该漏洞源于SELinux在引入TCP Fast Open支持时未检查连接相关权限，可能导致权限绕过。
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 cf60af03ca4e71134206809ea892e49b92a88896 ~ 11406d0d7e11b4e525bb2ace2c70107031d058da -
Linux Linux 3.6 -

II. Public POCs for CVE-2026-72243

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III. Intelligence Information for CVE-2026-72243

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Patches & Fixes for CVE-2026-72243 (6)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - 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-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-74394 9.8 CRITICAL RDMA/srpt: fix integer overflow in immediate data length check
CVE-2026-72417 9.8 CRITICAL netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72422 9.8 CRITICAL ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-72429 9.8 CRITICAL ipv6: ioam: fix type confusion of dst_entry
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72226 9.8 CRITICAL batman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-72451 9.8 CRITICAL xfrm: Fix xfrm state cache insertion race

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72243

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