CVE-2023-52480: ksmbd: fix race condition between session lookup and expire
First published: Thu Feb 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.15<5.15.145 | |
| Linux Kernel | >=5.16<6.1.57 | |
| Linux Kernel | >=6.2<6.5.7 | |
| Linux Kernel | =6.6-rc1 | |
| Linux Kernel | =6.6-rc2 | |
| Linux Kernel | =6.6-rc3 | |
| Linux Kernel | =6.6-rc4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- 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://launchpad.net/bugs/cve/CVE-2023-52480
- https://git.kernel.org/linus/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f
- https://security-tracker.debian.org/tracker/CVE-2023-52480
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52480
- https://nvd.nist.gov/vuln/detail/CVE-2023-52480
- https://ubuntu.com/security/CVE-2023-52480
Frequently Asked Questions
What is the severity of CVE-2023-52480?
CVE-2023-52480 is classified as a moderate severity vulnerability due to its impact on session management in the Linux kernel.
How do I fix CVE-2023-52480?
To fix CVE-2023-52480, update to the recommended Linux kernel versions, specifically 5.10.223-1, 6.1.123-1, or higher.
Which versions of the Linux kernel are affected by CVE-2023-52480?
CVE-2023-52480 affects Linux kernel versions from 5.15 to 6.6-rc4.
What type of vulnerability is CVE-2023-52480?
CVE-2023-52480 is a race condition vulnerability that occurs between session lookup and expiration in the ksmbd module.
Is there a known exploit for CVE-2023-52480?
As of now, there are no publicly known exploits specifically targeting CVE-2023-52480.
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