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Review reviewCritical

CVE-2026-53010

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_open during durable reconnect In smb2_open, the call to ksmbd_put_durable_fd(fp) drops the reference to the durable file descriptor early during the durable reconnect process. If an error occurs subsequently (eg, ksmbd_iov_pin_rsp fails) or a scavenger accesses the file, it leads to a use-after-free when accessing fp properties (eg fp->create_time). Move the single put to the end of the function below err_out2 so fp stays valid until smb2_open returns.

CVSS
9.8
EPSS
0.43%
35.3% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.43%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_open during durable reconnect In smb2_open, the call to ksmbd_put_durable_fd(fp) drops the reference to the durable file descriptor early during the durable reconnect process. If an error occurs subsequently (eg, ksmbd_iov_pin_rsp fails) or a scavenger accesses the file, it leads to a use-after-free when accessing fp properties (eg fp->create_time). Move the single put to the end of the function below err_out2 so fp stays valid until smb2_open returns.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= c8efcc786146a951091588e5fa7e3c754850cb3c < ce2e164c1c51c3f7813b80f8c926836e896bcbb3, >= c8efcc786146a951091588e5fa7e3c754850cb3c < 97a0cd55283b4e63fd92804da91c8d9896adcad9, >= c8efcc786146a951091588e5fa7e3c754850cb3c < 1baff47b81f94f9231c91236aa511420d0e266b9, >= 8df4bcdb0a4232192b2445256c39b787d58ef14d, >= 6.6.32 < 6.7, >= 6.9, >= 6.9 < 6.18.33, >= 6.19 < 7.0.10
Fixed versions
6.7, 6.18.33, 7.0.10

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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2026-53010 — Linux Linux, linux kernel | SECUFOCUS NOW