CVE-2026-53010 ksmbd: fix use-after-free in smb2_open during durable reconnect

What is CVE-2026-53010?

CVE-2026-53010 is a critical use after free vulnerability in Linux kernel, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-416

Which versions are affected by CVE-2026-53010?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53010?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-53010 being exploited?

There is no known exploitation of CVE-2026-53010 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-53010, DEBIAN-CVE-2026-53010, GHSA-xvgg-vwv8-fvr6, ROOT-OS-DEBIAN-13-CVE-2026-53010, UBUNTU-CVE-2026-53010.