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CVE-2026-93785— cifs: validate idmap key payload length

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.

在 Linux 内核中，已修复以下漏洞： cifs：验证 idmap 密钥有效载荷长度 cifs.idmap 密钥类型将其有效载荷长度存储在 中，该值被限制为 U16_MAX（即 65535）。如果接受更大的密钥有效载荷，会导致记录的长度被截断，从而使后续使用者在解释有效载荷时可能使用不一致的边界条件。 因此，在分配或复制预处理过的密钥有效载荷之前，拒绝尺寸过大的有效载荷。此举可确保 与内联存储以及单独分配的 idmap 有效载荷中的数据保持一致。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 21fed0d5b763b94a7d1568c27d0cce892ab8d43e< eeac976b74b4f697cfc517187b7cbfd72652dbbc affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 125b05ac8ca8758950e4369c1542d57a162f504c affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 945f6cde6bcf8f08f6fa5df8882b1b9582e55efa affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 3a4a34a732e8a08309eed0a74314dbd9f2f1c972 affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 6cfeef221ac00d63c07f6122f58e6159bde69ca0 affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 8b12f65d7caf16d124098cb4895a203367d35b57 affected
21fed0d5b763b94a7d1568c27d0cce892ab8d43e< 455488cd5054bcc59db40fa1cc2c004031a5b2a5 affected
3.2 affected
… +8 more rows
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I. Basic Information for CVE-2026-93785

Vulnerability Information
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Vulnerability Title
cifs: validate idmap key payload length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: validate idmap key payload length The cifs.idmap key type stores its payload length in key->datalen, which is limited to U16_MAX. Accepting a larger key payload truncates the recorded length and can make later users interpret the payload using inconsistent bounds. Reject oversized preparsed payloads before allocating or copying them. This keeps key->datalen consistent with the stored data for both inline and separately allocated idmap payloads.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 21fed0d5b763b94a7d1568c27d0cce892ab8d43e ~ eeac976b74b4f697cfc517187b7cbfd72652dbbc -
Linux Linux 3.2 -

II. Public POCs for CVE-2026-93785

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III. Intelligence Information for CVE-2026-93785

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Patches & Fixes for CVE-2026-93785 (7)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93785

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