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Message-ID: <2024102112-CVE-2024-47748-a134@gregkh> Date: Mon, 21 Oct 2024 14:16:27 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-47748: vhost_vdpa: assign irq bypass producer token correctly Description =========== In the Linux kernel, the following vulnerability has been resolved: vhost_vdpa: assign irq bypass producer token correctly We used to call irq_bypass_unregister_producer() in vhost_vdpa_setup_vq_irq() which is problematic as we don't know if the token pointer is still valid or not. Actually, we use the eventfd_ctx as the token so the life cycle of the token should be bound to the VHOST_SET_VRING_CALL instead of vhost_vdpa_setup_vq_irq() which could be called by set_status(). Fixing this by setting up irq bypass producer's token when handling VHOST_SET_VRING_CALL and un-registering the producer before calling vhost_vring_ioctl() to prevent a possible use after free as eventfd could have been released in vhost_vring_ioctl(). And such registering and unregistering will only be done if DRIVER_OK is set. The Linux kernel CVE team has assigned CVE-2024-47748 to this issue. Affected and fixed versions =========================== Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 5.10.227 with commit 0c170b1e918b Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 5.15.168 with commit 927a2580208e Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 6.1.113 with commit ec5f1b54ceb2 Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 6.6.54 with commit ca64edd7ae93 Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 6.10.13 with commit fae9b1776f53 Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 6.11.2 with commit 7cf2fb51175c Issue introduced in 5.9 with commit 2cf1ba9a4d15 and fixed in 6.12-rc1 with commit 02e9e9366fef Please see https://www.kernel.org for 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-2024-47748 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: drivers/vhost/vdpa.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/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0 https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1 https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0 https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2 https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319
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