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CVE-2026-68431— ksmbd: validate minimum PDU size for transform requests

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ksmbd对转换请求的最小PDU大小验证不足，导致短转换数据包被当作完整SMB2头处理，造成越界读取，可能将信息泄露给未认证客户端。

CVSS 9.1 · Critical EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux df3a4518aee64f21bcafa891105b468413f27431< 22f1aa35b87e471cc31b35b74451f46630863b12 affected
543c12c2644e772caa6880662c2a852cfdc5a10c< 928dda88d0e13fbca381255028f65b244343a4ea affected
368ba06881c395f1c9a7ba22203cf8d78b4addc0< d8e5c5672724b8f3c4c099d2cf60239c996e5424 affected
368ba06881c395f1c9a7ba22203cf8d78b4addc0< 32e486b70c256d5ef4baa5a2936ade2fea50e8eb affected
368ba06881c395f1c9a7ba22203cf8d78b4addc0< d9e9753dfd43bd27c956578df7804a3c90b80fdc affected
368ba06881c395f1c9a7ba22203cf8d78b4addc0< b62c510f59803f82f9b4c76ead2a56833b2984c7 affected
368ba06881c395f1c9a7ba22203cf8d78b4addc0< cfc0b8e5080aec87700774e8568765eaa4b7b92b affected
e9cb7be2fcbaee9e808b729e92948d38d52e5add affected
… +12 more rows
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I. Basic Information for CVE-2026-68431

Vulnerability Information
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Vulnerability Title
ksmbd: validate minimum PDU size for transform requests
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate minimum PDU size for transform requests The receive path applies the minimum SMB2 PDU size check only when ProtocolId is SMB2_PROTO_NUMBER. A packet carrying SMB2_TRANSFORM_PROTO_NUM bypasses the check even when the negotiated dialect does not provide transform handling. On an SMB 2.1 connection, a short transform packet therefore reaches init_smb2_rsp_hdr(), which interprets the request as a full SMB2 header and reads beyond the request allocation. The copied fields can then be returned to the unauthenticated client. Compression transforms are converted to ordinary SMB2 messages before protocol validation. After that conversion, validate ordinary SMB2 requests against SMB2_MIN_SUPPORTED_PDU_SIZE and require encryption transform requests to contain both a transform header and an SMB2 header. This rejects truncated requests before work allocation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ksmbd对转换请求的最小PDU大小验证不足，导致短转换数据包被当作完整SMB2头处理，造成越界读取，可能将信息泄露给未认证客户端。
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 df3a4518aee64f21bcafa891105b468413f27431 ~ 22f1aa35b87e471cc31b35b74451f46630863b12 -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-68431

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III. Intelligence Information for CVE-2026-68431

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Patches & Fixes for CVE-2026-68431 (7)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68432 8.8 HIGH vxlan: require CAP_NET_ADMIN in the device netns for changelink
CVE-2026-68433 8.6 HIGH libceph: bound get_version reply decode to front len
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68445 7.8 HIGH drm/vc4: Prevent shader BO mappings from becoming writable
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68450 btrfs: free mapping node on duplicate reloc root insert
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup
CVE-2026-68434 serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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