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Message-ID: <2024110555-CVE-2024-50116-64fb@gregkh> Date: Tue, 5 Nov 2024 18:11:05 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-50116: nilfs2: fix kernel bug due to missing clearing of buffer delay flag Description =========== In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix kernel bug due to missing clearing of buffer delay flag Syzbot reported that after nilfs2 reads a corrupted file system image and degrades to read-only, the BUG_ON check for the buffer delay flag in submit_bh_wbc() may fail, causing a kernel bug. This is because the buffer delay flag is not cleared when clearing the buffer state flags to discard a page/folio or a buffer head. So, fix this. This became necessary when the use of nilfs2's own page clear routine was expanded. This state inconsistency does not occur if the buffer is written normally by log writing. The Linux kernel CVE team has assigned CVE-2024-50116 to this issue. Affected and fixed versions =========================== Issue introduced in 3.10 with commit 8c26c4e2694a and fixed in 5.15.170 with commit 822203f6355f Issue introduced in 3.10 with commit 8c26c4e2694a and fixed in 6.1.115 with commit 27524f65621f Issue introduced in 3.10 with commit 8c26c4e2694a and fixed in 6.6.59 with commit 743c78d455e7 Issue introduced in 3.10 with commit 8c26c4e2694a and fixed in 6.11.6 with commit c6f58ff2d4c5 Issue introduced in 3.10 with commit 8c26c4e2694a and fixed in 6.12-rc5 with commit 6ed469df0bfb 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-2024-50116 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/nilfs2/page.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/822203f6355f4b322d21e7115419f6b98284be25 https://git.kernel.org/stable/c/27524f65621f490184f2ace44cd8e5f3685af4a3 https://git.kernel.org/stable/c/743c78d455e784097011ea958b27396001181567 https://git.kernel.org/stable/c/c6f58ff2d4c552927fe9a187774e668ebba6c7aa https://git.kernel.org/stable/c/6ed469df0bfbef3e4b44fca954a781919db9f7ab
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