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Review reviewHigh

CVE-2025-37750

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in decryption with multichannel After commit f7025d861694 ("smb: client: allocate crypto only for primary server") and commit b0abcd65ec54 ("smb: client: fix UAF in async decryption"), the channels started reusing AEAD TFM from primary channel to perform synchronous decryption, but that can't done as there could be multiple cifsd threads (one per channel) simultaneously accessing it to perform decryption. This fixes the following KASAN splat when running fstest generic/249 with 'vers=3.1.1,multichannel,...

CVSS
7.8
EPSS
0.36%
28.6% percentile
CISA KEV
Not listed
Published
2025.05.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.36%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in decryption with multichannel After commit f7025d861694 ("smb: client: allocate crypto only for primary server") and commit b0abcd65ec54 ("smb: client: fix UAF in async decryption"), the channels started reusing AEAD TFM from primary channel to perform synchronous decryption, but that can't done as there could be multiple cifsd threads (one per channel) simultaneously accessing it to perform decryption. This fixes the following KASAN splat when running fstest generic/249 with 'vers=3.1.1,multichannel,...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= b0abcd65ec545701b8793e12bc27dc98042b151a < aa5a1e4b882964eb79d5b5d1d1e8a1a5efbb1d15, >= b0abcd65ec545701b8793e12bc27dc98042b151a < e859b216d94668bc66330e61be201234f4413d1a, >= b0abcd65ec545701b8793e12bc27dc98042b151a < 950557922c1298464749c216d8763e97faf5d0a6, >= b0abcd65ec545701b8793e12bc27dc98042b151a < 9502dd5c7029902f4a425bf959917a5a9e7c0e50, >= 8f14a476abba13144df5434871a7225fd29af633, >= ef51c0d544b1518b35364480317ab6d3468f205d, >= bce966530fd5542bbb422cb45ecb775f7a1a6bc3, >= 0809fb86ad13b29e1d6d491364fc7ea4fb545995, >= 538c26d9bf70c90edc460d18c81008a4e555925a, >= 5.10.237 < 5.11, >= 5.15.181 < 5.16, >= 6.1.128 < 6.2, >= 6.6.57 < 6.7, >= 6.11.4 < 6.12, >= 6.12, >= 6.11.4 < 6.12.24, >= 6.13 < 6.13.12, >= 6.14 < 6.14.3, 6.15
Fixed versions
5.11, 5.16, 6.2, 6.7, 6.12.24, 6.13.12, 6.14.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416