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CVE-2026-46027— net/smc: avoid early lgr access in smc_clc_wait_msg

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smc_clc_wait_msg函数在握手早期阶段收到CLC拒绝时过早访问链路组状态，可能导致未定义行为。

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0cfdd8f92cac01afbb12e4500514036a2b78756b< 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< 22546729b96fc873b23065dc49e3d73c45cfb874 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< 5eedbfd82c2884e0010fdfb3c9446a6ebcadb691 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< f0858e1d5624bb120b198f2a8528f97a9b0ae069 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< 6180a296ca65b08a81914805cbc0f78da5f10a1f affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< ea0b5d0fe96356dce38f98375a57c52a04e13712 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< 83bcf9228b0501694fb2589ed1d142855a2887f2 affected
0cfdd8f92cac01afbb12e4500514036a2b78756b< 5a8db80f721deee8e916c2cfdee78decda02ce4f affected
… +10 more rows
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I. Basic Information for CVE-2026-46027

Vulnerability Information
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Vulnerability Title
net/smc: avoid early lgr access in smc_clc_wait_msg
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/smc: avoid early lgr access in smc_clc_wait_msg A CLC decline can be received while the handshake is still in an early stage, before the connection has been associated with a link group. The decline handling in smc_clc_wait_msg() updates link-group level sync state for first-contact declines, but that state only exists after link group setup has completed. Guard the link-group update accordingly and keep the per-socket peer diagnosis handling unchanged. This preserves the existing sync_err handling for established link-group contexts and avoids touching link-group state before it is available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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smc_clc_wait_msg函数在握手早期阶段收到CLC拒绝时过早访问链路组状态，可能导致未定义行为。
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 0cfdd8f92cac01afbb12e4500514036a2b78756b ~ 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-46027

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III. Intelligence Information for CVE-2026-46027

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Patches & Fixes for CVE-2026-46027 (8)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45909 7.8 HIGH clk: mediatek: Drop __initconst from gates
CVE-2026-46015 7.8 HIGH tcp: call sk_data_ready() after listener migration
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-46062 7.8 HIGH ntfs3: fix integer overflow in run_unpack() volume boundary check
CVE-2026-46065 7.8 HIGH fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info
CVE-2026-45878 7.8 HIGH drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-45894 7.8 HIGH iommu/vt-d: Clear Present bit before tearing down PASID entry

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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