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CVE-2026-64597— smb: client: fix double-free in SMB2_close() replay

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于SMB2_close()重放过程中响应缓冲区被重复释放。

CVSS 9.8 · Critical EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 433042a91f9373241307725b52de573933ffedbf< 037511726228aaf165c7067ff2bfc88eaecdf1f3 affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 0aa97edf7c347c0f54e7e60c4740574b8120c66a affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< d15d83125007f673aec4323e1bbbaaffbe87ea13 affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< b18ed621dbfceecea5539848cddcb9272c9a61e1 affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< f96e1cdcb63ed3321142ff2fcdf784e32cda8fee affected
6.6.32< 6.6.145 affected
6.8 affected
< 6.8 unaffected
… +5 more rows
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I. Basic Information for CVE-2026-64597

Vulnerability Information
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Vulnerability Title
smb: client: fix double-free in SMB2_close() replay
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_close() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale 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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于SMB2_close()重放过程中响应缓冲区被重复释放。
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 433042a91f9373241307725b52de573933ffedbf ~ 037511726228aaf165c7067ff2bfc88eaecdf1f3 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-64597

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III. Intelligence Information for CVE-2026-64597

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Patches & Fixes for CVE-2026-64597 (5)

Same Patch Batch · Linux · 2026-08-06 · 22 CVEs total

CVE-2026-64586 8.8 HIGH wifi: brcmfmac: drain bus_reset work on device removal
CVE-2026-64598 8.8 HIGH smb/client: Fix error code in smb2_aead_req_alloc()
CVE-2026-64584 7.8 HIGH usb: gadget: f_midi: cancel pending IN work before freeing the midi object
CVE-2026-64585 7.8 HIGH can: esd_usb: kill anchored URBs before freeing netdevs
CVE-2026-64588 7.8 HIGH fuse-uring: fix data races on ring->ready
CVE-2026-64583 7.8 HIGH usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown
CVE-2026-64601 7.8 HIGH ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on ea
CVE-2026-64599 7.8 HIGH crypto: amlogic - avoid double cleanup in meson_crypto_probe()
CVE-2026-64587 7.0 HIGH net: ethernet: arc: emac: quiesce interrupts before requesting IRQ
CVE-2026-68480 x86/bugs: Make Safe-RET robust against interrupt injection
CVE-2026-64604 KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode
CVE-2026-64603 platform/x86: intel-hid: Protect ACPI notify handler against recursion
CVE-2026-64602 iio: adc: spear: Initialize completion before requesting IRQ
CVE-2026-64596 libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()
CVE-2026-64595 HID: hid-lenovo-go: cancel cfg_setup work in hid_go_cfg_remove()
CVE-2026-64593 btrfs: do not trim a device which is not writeable
CVE-2026-64594 usb: gadget: f_fs: initialize reset_work at allocation time
CVE-2026-64592 riscv: mm: Unconditionally sfence.vma for spurious fault
CVE-2026-64591 iommu/vt-d: Avoid WARNING in sva unbind path
CVE-2026-64590 dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64597

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