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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-09-14
• Weakness: CWE-416

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.

Affected products

• Linux kernel: from 6.6.32 before 6.7; from 6.9 before 6.18.33; from 6.19 before 7.0.10 — fixed in 6.18.33, 6.7, 7.0.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.33, 6.7, 7.0.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1baff47b81f94f9231c91236aa511420d0e266b9
• https://git.kernel.org/stable/c/4db3dcac84c2f14a45ae201efb38de1fb1bfc009
• https://git.kernel.org/stable/c/97a0cd55283b4e63fd92804da91c8d9896adcad9
• https://git.kernel.org/stable/c/ce2e164c1c51c3f7813b80f8c926836e896bcbb3
• https://git.kernel.org/stable/c/f0ff7f12398e85b3a11745ff7feab6246f3d75c2

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