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CVE-2023-52480

Disclosure Date: February 29, 2024
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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.

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General Information

Vendors

  • Linux

Products

  • Linux
Technical Analysis