CVE-2026-64384— smb: client: fix change notify replay double-free
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 13
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 433042a91f9373241307725b52de573933ffedbf< 5821f9dbb8b5b24391850a13418e633edd0fb003 | affected |
4f1fffa2376922f3d1d506e49c0fd445b023a28e< d684f4134998085702009b94c35c2003fc9e72d3 | affected | ||
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 52af1975f0dfae990c5a0e85872cc41be0e88a68 | affected | ||
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 901891513951bc8322ece754863909ea45af95c6 | affected | ||
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 145f820dcbb2cced374f2532f8a61a44dce4a615 | 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-2026-64384
Vulnerability Information
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Vulnerability Title
smb: client: fix change notify replay double-free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_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smb客户端处理change notify重放时响应缓冲区双重释放问题，可能导致拒绝服务攻击。
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
II. Public POCs for CVE-2026-64384
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-64384 (5)
Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total
| CVE-2026-64355 | 9.8 CRITICAL | bpf: Reject fragmented frames in devmap |
| CVE-2026-64410 | 9.8 CRITICAL | netfilter: flowtable: IPIP tunnel hardware offload is not yet support |
| CVE-2026-64399 | 9.8 CRITICAL | ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE |
| CVE-2026-64397 | 9.8 CRITICAL | ksmbd: serialize QUERY_DIRECTORY requests per file |
| CVE-2026-64391 | 9.8 CRITICAL | ksmbd: use opener credentials for ADS I/O |
| CVE-2026-64387 | 9.8 CRITICAL | smb: client: fix query directory replay double-free |
| CVE-2026-64386 | 9.8 CRITICAL | smb: client: fix query_info() replay double-free |
| CVE-2026-64385 | 9.8 CRITICAL | smb: client: fix double-free in SMB2_ioctl() replay |
| CVE-2026-64383 | 9.8 CRITICAL | smb: client: fix double-free in SMB2_flush() replay |
| CVE-2026-64268 | 9.8 CRITICAL | RDMA/siw: bound Read Response placement to the RREAD length |
| CVE-2026-64439 | 9.8 CRITICAL | crypto: krb5 - filter out async aead implementations at alloc |
| CVE-2026-64303 | 9.8 CRITICAL | spi: fsl-lpspi: terminate the RX channel on TX prepare failure path |
| CVE-2026-64523 | 9.8 CRITICAL | net/handshake: Take a long-lived file reference at submit |
| CVE-2026-64459 | 9.8 CRITICAL | tcp: restore RCU grace period in tcp_ao_destroy_sock |
| CVE-2026-64319 | 9.1 CRITICAL | nvmet-auth: validate reply message payload bounds against transfer length |
| CVE-2026-64257 | 9.1 CRITICAL | smb: client: reject overlapping data areas in SMB2 responses |
| CVE-2026-64269 | 9.1 CRITICAL | RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg |
| CVE-2026-64393 | 9.1 CRITICAL | ksmbd: run set info with opener credentials |
| CVE-2026-64392 | 9.1 CRITICAL | ksmbd: use opener credentials for delete-on-close |
| CVE-2026-64320 | 9.1 CRITICAL | nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page |
Showing top 20 of 274 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
Same vendor: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
V. Comments for CVE-2026-64384
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