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CVE-2026-46181— RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

CVSS 7.8 · High EPSS 0.01% · P2

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux30353bfc43a1602c020f31d95cf27182ffd23824< 1e2a44875b6afb4add1115f7f3351dcbeb6f273daffected
30353bfc43a1602c020f31d95cf27182ffd23824< 8b7833f3bce35cb0d01c1503781523c099c675f0affected
30353bfc43a1602c020f31d95cf27182ffd23824< c9341307ea16b9395c2e4c9c94d8499d91fe31d0affected
4.9affected
< 4.9unaffected
6.18.30≤ 6.18.*unaffected
7.0.7≤ 7.0.*unaffected
7.1-rc3≤ *unaffected
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I. Basic Information for CVE-2026-46181

Vulnerability Information
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Vulnerability Title
RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees the mlx4_srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing. Use the spinlock since it isn't easy to make RCU work, use refcount_inc_not_zero() to protect against partially initialized objects, and order the refcount_set() to be after the srq is fully initialized.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于RDMA mlx4中mlx4_srq_event()错误使用RCU，可能导致事件在对象初始化前传递或释放后重用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 30353bfc43a1602c020f31d95cf27182ffd23824 ~ 1e2a44875b6afb4add1115f7f3351dcbeb6f273d -
LinuxLinux 4.9 -

II. Public POCs for CVE-2026-46181

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III. Intelligence Information for CVE-2026-46181

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Patches & Fixes for CVE-2026-46181 (3)

Same Patch Batch · Linux · 2026-05-28 · 138 CVEs total

CVE-2026-461359.8 CRITICALnvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-461379.8 CRITICALmptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-461959.8 CRITICALsmb: client: validate dacloffset before building DACL pointers
CVE-2026-461159.8 CRITICALblock: add pgmap check to biovec_phys_mergeable
CVE-2026-461859.1 CRITICALsmb/client: fix out-of-bounds read in symlink_data()
CVE-2026-461199.1 CRITICALlibceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-461559.1 CRITICALsmb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-461668.8 HIGHwifi: mac80211: use safe list iteration in radar detect work
CVE-2026-461988.8 HIGHbatman-adv: fix integer overflow on buff_pos
CVE-2026-461258.8 HIGHwifi: mac80211: remove station if connection prep fails
CVE-2026-461748.8 HIGHx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-462388.8 HIGHbatman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-461528.8 HIGHwifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-461138.8 HIGHKVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-462128.8 HIGHbatman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-461388.1 HIGHBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-462328.1 HIGHHID: playstation: Clamp num_touch_reports
CVE-2026-461057.8 HIGHscsi: mpt3sas: Limit NVMe request size to 2 MiB
CVE-2026-462107.8 HIGHmedia: iris: fix use-after-free of fmt_src during MBPF check
CVE-2026-462277.8 HIGHsctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46181

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