SECUFOCUSNOW
Home›CVE index›CVE-2025-37778
Review reviewHigh

CVE-2025-37778

Linux Linux, linux kernel, debian linux

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix dangling pointer in krb_authenticate krb_authenticate frees sess->user and does not set the pointer to NULL. It calls ksmbd_krb5_authenticate to reinitialise sess->user but that function may return without doing so. If that happens then smb2_sess_setup, which calls krb_authenticate, will be accessing free'd memory when it later uses sess->user.

CVSS
7.8
EPSS
1.06%
61.3% 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 probability1.06%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix dangling pointer in krb_authenticate krb_authenticate frees sess->user and does not set the pointer to NULL. It calls ksmbd_krb5_authenticate to reinitialise sess->user but that function may return without doing so. If that happens then smb2_sess_setup, which calls krb_authenticate, will be accessing free'd memory when it later uses sess->user.

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= 0626e6641f6b467447c81dd7678a69c66f7746cf < b61f04d5d73c53d183019bafe22fb700a739bac5, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < d5b554bc8d554ed6ddf443d3db2fad9f665cec10, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 1db2451de23e98bc864c6a6e52aa0d82c91cb325, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 6e30c0e10210c714f3d4453dc258d4abcc70364e, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < e83e39a5f6a01a81411a4558a59a10f87aa88dd6, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 1e440d5b25b7efccb3defe542a73c51005799a5f, >= 5.15 < 6.1.135, >= 6.2 < 6.6.88, >= 6.7 < 6.12.25, >= 6.13 < 6.14.4, 6.15, 11.0
Fixed versions
6.1.135, 6.6.88, 6.12.25, 6.14.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux 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
CVE-2025-37778 — Linux Linux, linux kernel, debian linux | SECUFOCUS NOW