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CVE-2026-100071— net: hsr: free learned nodes on device setup failure

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.

在 Linux 内核中，以下漏洞已得到修复： 网络子系统：hsr：在设备初始化失败时释放已学习的节点 hsr_dev_finalize() 可能在低层设备（lower-device）的接收（RX）处理程序已经注册的情况下失败（例如，先添加从设备 A，再添加可能失败的从设备 B，以及添加互联链路）。由于无论主设备状态如何，接收处理程序都会在软中断（softirq）上下文中运行，因此在此时间窗口内接收到的帧可能会动态地将节点学习到 node_db 中，而错误回退（error unwind）逻辑从未释放这些节点。 在错误

AI Predicted 3.3 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< e691eee886871b933d772ffc76d66c80b4c0a25e affected
81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< 0a340ffd96943a49a78e367efac9517ca767d99b affected
81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< f7289e3492f2694dccd3d79287e0e31879b58650 affected
81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< 65702339b3e9fd792f65d4b740928798194d86ce affected
81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< 49b01f2939abc676a6f9a118f07a10110ee5f683 affected
81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8< 7f16289b91eb316f170a6bd22d32e6c632f6a5b6 affected
3.17 affected
< 3.17 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-100071

Vulnerability Information
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Vulnerability Title
net: hsr: free learned nodes on device setup failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: hsr: free learned nodes on device setup failure hsr_dev_finalize() can fail after a lower-device RX handler has already been registered (slave A is added before the failable slave B and interlink adds). RX handlers run in softirq regardless of the master's state, so frames received in that window can learn dynamic nodes into node_db, and the error unwind never releases them. Free both owned dynamic databases in the unwind, mirroring hsr_dellink(). proxy_node_db is provably empty on every current error exit (only interlink RX feeds it, and the interlink add is the last failable step) and is freed for symmetry. The order is safe: hsr_del_port() unregisters each RX handler with synchronize_net() before hsr_del_nodes() runs, which removes remaining entries with list_del_rcu() and defers their release with call_rcu() for readers already under RCU.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 ~ e691eee886871b933d772ffc76d66c80b4c0a25e -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-100071

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III. Intelligence Information for CVE-2026-100071

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Patches & Fixes for CVE-2026-100071 (6)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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