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CVE-2026-45972— smb: client: fix potential UAF and double free in smb2_open_file()

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，该漏洞源于在smb2_open_file中未清零err_iov和err_buftype，可能导致释放后重用和双重释放。

CVSS 9.8 · Critical EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 743f70406264348c0830f38409eb6c40a42fb2db< 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 affected
3a6d6b332f92990958602c1e35ce0173e2dd62e9< 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151 affected
b64e3b5d8d759dd4333992e4ba4dadf9359952c8< 4d339b219004869e96c4ce56b8891f83a38da4c0 affected
9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5< e66dcf7bb9c4df5582c82bc3582725abcbfbea73 affected
e3a43633023e3cacaca60d4b8972d084a2b06236< 639deb962986ef2f5e2a6d5a600c66f922471e81 affected
e3a43633023e3cacaca60d4b8972d084a2b06236< ebbbc4bfad4cb355d17c671223d0814ee3ef4eda affected
6.1.163< 6.1.165 affected
6.6.124< 6.6.128 affected
… +10 more rows
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I. Basic Information for CVE-2026-45972

Vulnerability Information
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Vulnerability Title
smb: client: fix potential UAF and double free in smb2_open_file()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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，该漏洞源于在smb2_open_file中未清零err_iov和err_buftype，可能导致释放后重用和双重释放。
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 743f70406264348c0830f38409eb6c40a42fb2db ~ 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-45972

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III. Intelligence Information for CVE-2026-45972

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Patches & Fixes for CVE-2026-45972 (6)

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

CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
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-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45878 7.8 HIGH drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-46065 7.8 HIGH fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-45909 7.8 HIGH clk: mediatek: Drop __initconst from gates
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
CVE-2026-45942 7.8 HIGH ext4: fix e4b bitmap inconsistency reports
CVE-2026-45933 7.8 HIGH bpf: Preserve id of register in sync_linked_regs()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45972

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