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Message-ID: <2024022922-CVE-2023-52480-ff7f@gregkh> Date: Thu, 29 Feb 2024 06:43:23 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2023-52480: ksmbd: fix race condition between session lookup and expire From: gregkh@...nel.org 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. The Linux kernel CVE team has assigned CVE-2023-52480 to this issue. Affected and fixed versions =========================== Fixed in 5.15.145 with commit c77fd3e25a51 Fixed in 6.1.57 with commit a2ca5fd3dbcc Fixed in 6.5.7 with commit 18ced78b0ebc Fixed in 6.6 with commit 53ff5cf89142 Please see https://www.kernel.org or a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-52480 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: fs/smb/server/connection.c fs/smb/server/connection.h fs/smb/server/mgmt/user_session.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f
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