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CVE-2026-72022— llc: fix SAP refcount leak in llc_ui_autobind()

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存在安全漏洞，该漏洞源于llc_ui_autobind()函数在自动绑定过程中未释放调用者的SAP引用，导致SAP引用计数泄漏，可能致使重复的自动绑定和关闭循环消耗所有动态SAP值，导致后续自动绑定失败。

AI Predicted 7.8 Difficulty: Easy EPSS 0.21% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 79dc4b508e3f2649390a1f745f7657813e5938ec affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a2f9fa31ae021ef1fdcaf3ab17bd49f9223dd6a4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b589a965184dde49c43b8caf5bcc65715a7b4ef2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c7881b6088276601beaccb7440b8d56eab0d65ae affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b2fc9955ddc7c4ca03be44b995193bd6486c62e1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 61a7ff4a62003b55a15022567486741b3bd83914 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 21a537606fe35be2b85971a5fd35c0023b6ef98f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 660667cd406648bbaffbd5c0d897c2263a852f11 affected
… +10 more rows
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I. Basic Information for CVE-2026-72022

Vulnerability Information
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Vulnerability Title
llc: fix SAP refcount leak in llc_ui_autobind()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: llc: fix SAP refcount leak in llc_ui_autobind() llc_ui_autobind() opens a SAP after choosing a dynamic LSAP. llc_sap_open() returns a reference owned by the caller, and llc_sap_add_socket() takes a second reference for the socket's membership in the SAP hash tables. llc_ui_bind() drops the caller's reference after adding the socket, but llc_ui_autobind() keeps it. When the socket is closed, llc_sap_remove_socket() releases only the socket reference, leaving the SAP on llc_sap_list with sk_count == 0. This is user-visible because repeated autobind and close cycles can consume all dynamic SAP values and make later autobinds fail with -EUSERS. Drop the caller's reference after a successful autobind, matching llc_ui_bind()'s ownership model.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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存在安全漏洞，该漏洞源于llc_ui_autobind()函数在自动绑定过程中未释放调用者的SAP引用，导致SAP引用计数泄漏，可能致使重复的自动绑定和关闭循环消耗所有动态SAP值，导致后续自动绑定失败。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 79dc4b508e3f2649390a1f745f7657813e5938ec -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-72022

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III. Intelligence Information for CVE-2026-72022

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Patches & Fixes for CVE-2026-72022 (8)

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

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-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
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-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72491 9.8 CRITICAL net/9p: fix race condition on rdma->state in trans_rdma.c
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72222 9.8 CRITICAL sunrpc: pin svc_xprt across the asynchronous TLS handshake callback
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72399 9.8 CRITICAL net: enetc: check the number of BDs needed for xdp_frame
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

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-2026-72022

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