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Message-ID: <2024030254-CVE-2023-52566-69f0@gregkh> Date: Sat, 2 Mar 2024 23:00:00 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2023-52566: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() Description =========== In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [konishi.ryusuke@...il.com: NOTE added to the commit log] The Linux kernel CVE team has assigned CVE-2023-52566 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 4.14.327 with commit fb1084e63ee5 Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 4.19.296 with commit bb61224f6abc Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 5.4.258 with commit 193b5a1c6c67 Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 5.10.198 with commit 7130a87ca323 Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 5.15.134 with commit 3936e8714907 Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 6.1.56 with commit 980663f1d189 Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 6.5.6 with commit 28df4646ad8b Issue introduced in 2.6.30 with commit a3d93f709e89 and fixed in 6.6 with commit 7ee29facd8a9 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-2023-52566 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/gcinode.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/fb1084e63ee56958b0a56e17a50a4fd86445b9c1 https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5b https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33 https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7 https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8 https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8c https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2 https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc
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