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Message-ID: <2025122426-CVE-2023-53998-2282@gregkh> Date: Wed, 24 Dec 2025 11:56:42 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2023-53998: hwrng: virtio - Fix race on data_avail and actual data From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: hwrng: virtio - Fix race on data_avail and actual data The virtio rng device kicks off a new entropy request whenever the data available reaches zero. When a new request occurs at the end of a read operation, that is, when the result of that request is only needed by the next reader, then there is a race between the writing of the new data and the next reader. This is because there is no synchronisation whatsoever between the writer and the reader. Fix this by writing data_avail with smp_store_release and reading it with smp_load_acquire when we first enter read. The subsequent reads are safe because they're either protected by the first load acquire, or by the completion mechanism. Also remove the redundant zeroing of data_idx in random_recv_done (data_idx must already be zero at this point) and data_avail in request_entropy (ditto). The Linux kernel CVE team has assigned CVE-2023-53998 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 4.19.291 with commit 241ef15776a7c8505008db689175b320d345ecd3 Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 5.4.251 with commit a43bcb0b661cbbf3ad797d2aee6b6fd06b8fc69d Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 5.10.188 with commit 77471e4912d3960dafe141e268c44be8024fe4dc Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 5.15.121 with commit c76d991b6f01a5d931e7053a73bc9524975a5215 Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 6.1.39 with commit 22c30022cde6e2c88612b3a499223cfa912f1bc7 Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 6.3.13 with commit 318657b4c2077289659f1cd9e2a34f6a3b208e3e Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 6.4.4 with commit 2fc91f156b3f3446a1bce80cf4adedcbf41271c2 Issue introduced in 2.6.26 with commit f7f510ec195781c857ab76366a3e1c59e1caae42 and fixed in 6.5 with commit ac52578d6e8d300dd50f790f29a24169b1edd26c 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-2023-53998 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/char/hw_random/virtio-rng.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/241ef15776a7c8505008db689175b320d345ecd3 https://git.kernel.org/stable/c/a43bcb0b661cbbf3ad797d2aee6b6fd06b8fc69d https://git.kernel.org/stable/c/77471e4912d3960dafe141e268c44be8024fe4dc https://git.kernel.org/stable/c/c76d991b6f01a5d931e7053a73bc9524975a5215 https://git.kernel.org/stable/c/22c30022cde6e2c88612b3a499223cfa912f1bc7 https://git.kernel.org/stable/c/318657b4c2077289659f1cd9e2a34f6a3b208e3e https://git.kernel.org/stable/c/2fc91f156b3f3446a1bce80cf4adedcbf41271c2 https://git.kernel.org/stable/c/ac52578d6e8d300dd50f790f29a24169b1edd26c
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