What’s Vulnerable › Vulnerabilities

CVE-2023-52480: ksmbd: fix race condition between session lookup and expire

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-29 · updated 2026-08-15
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix race condition between session lookup and expire Thread A + Thread B ksmbd_session_lookup | smb2_sess_setup sess = xa_load | | | xa_erase(&conn->sessions, sess->id); | | ksmbd_session_destroy(sess) --> kfree(sess) | // UAF! | sess->last_active = jiffies | + This patch add rwsem to fix race condition between ksmbd_session_lookup and ksmbd_expire_session.

Affected products

• Linux kernel: from 5.15 before 5.15.145; from 5.16 before 6.1.57; from 6.2 before 6.5.7; 6.6-rc1, 6.6-rc2, 6.6-rc3, 6.6-rc4 — fixed in 5.15.145, 6.1.57, 6.5.7

How to fix

Upgrade to a fixed version: Linux kernel 5.15.145, 6.1.57, 6.5.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be
• https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f
• https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b
• https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f
• https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be
• https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f
• https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b
• https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f

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