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CVE-2026-31433— ksmbd: fix potencial OOB in get_file_all_info() for compound 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ksmbd在处理复合请求QUERY_DIRECTORY + QUERY_INFO(FILE_ALL_INFORMATION)时存在潜在越界写入，可能导致smbConvertToUTF16转换时超出响应缓冲区。

CVSS 8.8 · High EPSS 0.72% · P53

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f2283680a80571ca82d710bc6ecd8f8beac67d63< 3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 affected
9f297df20d93411c0b4ddad7f88ba04a7cd36e77< 4cca3eff2099b18672934a39cee70aed835d652c affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d< 358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d< 7aec5a769d2356cbf344d85bcfd36de592ac96a5 affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d< b0cd9725fe2bcc9f37d096b132318a9060373f5d affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d< 9d7032851d6f5adbe2739601ca456c0ad3b422f0 affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d< beef2634f81f1c086208191f7228bce1d366493d affected
5.15.145< 5.15.203 affected
… +10 more rows
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I. Basic Information for CVE-2026-31433

Vulnerability Information
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Vulnerability Title
ksmbd: fix potencial OOB in get_file_all_info() for compound requests
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix potencial OOB in get_file_all_info() for compound requests When a compound request consists of QUERY_DIRECTORY + QUERY_INFO (FILE_ALL_INFORMATION) and the first command consumes nearly the entire max_trans_size, get_file_all_info() would blindly call smbConvertToUTF16() with PATH_MAX, causing out-of-bounds write beyond the response buffer. In get_file_all_info(), there was a missing validation check for the client-provided OutputBufferLength before copying the filename into FileName field of the smb2_file_all_info structure. If the filename length exceeds the available buffer space, it could lead to potential buffer overflows or memory corruption during smbConvertToUTF16 conversion. This calculating the actual free buffer size using smb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is insufficient and updating smbConvertToUTF16 to use the actual filename length (clamped by PATH_MAX) to ensure a safe copy operation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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ksmbd在处理复合请求QUERY_DIRECTORY + QUERY_INFO(FILE_ALL_INFORMATION)时存在潜在越界写入，可能导致smbConvertToUTF16转换时超出响应缓冲区。
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 f2283680a80571ca82d710bc6ecd8f8beac67d63 ~ 3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-31433

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III. Intelligence Information for CVE-2026-31433

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31464 8.1 HIGH scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31488 7.8 HIGH drm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-31479 7.8 HIGH drm/xe: always keep track of remap prev/next
CVE-2026-31490 7.8 HIGH drm/xe/pf: Fix use-after-free in migration restore
CVE-2026-31494 7.8 HIGH net: macb: use the current queue number for stats
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31449 7.8 HIGH ext4: validate p_idx bounds in ext4_ext_correct_indexes
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31505 7.8 HIGH iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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