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Date: Fri, 17 May 2024 15:24:01 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-35821: ubifs: Set page uptodate in the correct place Description =========== In the Linux kernel, the following vulnerability has been resolved: ubifs: Set page uptodate in the correct place Page cache reads are lockless, so setting the freshly allocated page uptodate before we've overwritten it with the data it's supposed to have in it will allow a simultaneous reader to see old data. Move the call to SetPageUptodate into ubifs_write_end(), which is after we copied the new data into the page. The Linux kernel CVE team has assigned CVE-2024-35821 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 4.19.312 with commit 4aa554832b9d Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 5.4.274 with commit 778c6ad40256 Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 5.10.215 with commit 8f599ab6fabb Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 5.15.154 with commit f19b1023a375 Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 6.1.84 with commit 142d87c958d9 Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 6.6.24 with commit fc99f4e2d2f1 Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 6.7.12 with commit 4b7c4fc60d6a Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 6.8.3 with commit 17772bbe9cfa Issue introduced in 2.6.27 with commit 1e51764a3c2a and fixed in 6.9 with commit 723012cab779 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-2024-35821 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/ubifs/file.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/4aa554832b9dc9e66249df75b8f447d87853e12e https://git.kernel.org/stable/c/778c6ad40256f1c03244fc06d7cdf71f6b5e7310 https://git.kernel.org/stable/c/8f599ab6fabbca4c741107eade70722a98adfd9f https://git.kernel.org/stable/c/f19b1023a3758f40791ec166038d6411c8894ae3 https://git.kernel.org/stable/c/142d87c958d9454c3cffa625fab56f3016e8f9f3 https://git.kernel.org/stable/c/fc99f4e2d2f1ce766c14e98463c2839194ae964f https://git.kernel.org/stable/c/4b7c4fc60d6a46350fbe54f5dc937aeaa02e675e https://git.kernel.org/stable/c/17772bbe9cfa972ea1ff827319f6e1340de76566 https://git.kernel.org/stable/c/723012cab779eee8228376754e22c6594229bf8f
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