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Message-ID: <2024030254-CVE-2023-52526-8928@gregkh> Date: Sat, 2 Mar 2024 22:53:10 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2023-52526: erofs: fix memory leak of LZMA global compressed deduplication Description =========== In the Linux kernel, the following vulnerability has been resolved: erofs: fix memory leak of LZMA global compressed deduplication When stressing microLZMA EROFS images with the new global compressed deduplication feature enabled (`-Ededupe`), I found some short-lived temporary pages weren't properly released, which could slowly cause unexpected OOMs hours later. Let's fix it now (LZ4 and DEFLATE don't have this issue.) The Linux kernel CVE team has assigned CVE-2023-52526 to this issue. Affected and fixed versions =========================== Issue introduced in 6.1 with commit 5c2a64252c5d and fixed in 6.1.57 with commit 6a5a8f0a9740 Issue introduced in 6.1 with commit 5c2a64252c5d and fixed in 6.5.7 with commit c955751cbf86 Issue introduced in 6.1 with commit 5c2a64252c5d and fixed in 6.6 with commit 75a5221630fe 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-2023-52526 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/erofs/decompressor_lzma.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/6a5a8f0a9740f865693d5aa97a42cc4504538e18 https://git.kernel.org/stable/c/c955751cbf864cf2055117dd3fe7f780d2a57b56 https://git.kernel.org/stable/c/75a5221630fe5aa3fedba7a06be618db0f79ba1e
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