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Message-ID: <2025091507-CVE-2022-50285-955c@gregkh> Date: Mon, 15 Sep 2025 16:21:27 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-50285: mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages The h->*_huge_pages counters are protected by the hugetlb_lock, but alloc_huge_page has a corner case where it can decrement the counter outside of the lock. This could lead to a corrupted value of h->resv_huge_pages, which we have observed on our systems. Take the hugetlb_lock before decrementing h->resv_huge_pages to avoid a potential race. The Linux kernel CVE team has assigned CVE-2022-50285 to this issue. Affected and fixed versions =========================== Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 4.9.332 with commit 3e50a07b6a5fcd39df1534d3fdaca4292a65efe6 Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 4.14.298 with commit 629c986e19fe9481227c7cdfd9a105bbc104d245 Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 4.19.264 with commit 2b35432d324898ec41beb27031d2a1a864a4d40e Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 5.4.223 with commit 11993652d0b49e27272db0a37aa828d8a3a4b92b Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 5.10.153 with commit 568e3812b1778b4c0c229649b59977d88f400ece Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 5.15.76 with commit 112a005d1ded04a4b41b6d01833cc0bda90625cc Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 6.0.6 with commit c828fab903725279aa9dc6ae3d44bb7e4778f92c Issue introduced in 4.4 with commit a88c769548047b21f76fd71e04b6a3300ff17160 and fixed in 6.1 with commit 12df140f0bdfae5dcfc81800970dd7f6f632e00c Issue introduced in 4.3.6 with commit 3f5fae4d1a3189d95b02b4b45e1218df147122bc 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-2022-50285 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: mm/hugetlb.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/3e50a07b6a5fcd39df1534d3fdaca4292a65efe6 https://git.kernel.org/stable/c/629c986e19fe9481227c7cdfd9a105bbc104d245 https://git.kernel.org/stable/c/2b35432d324898ec41beb27031d2a1a864a4d40e https://git.kernel.org/stable/c/11993652d0b49e27272db0a37aa828d8a3a4b92b https://git.kernel.org/stable/c/568e3812b1778b4c0c229649b59977d88f400ece https://git.kernel.org/stable/c/112a005d1ded04a4b41b6d01833cc0bda90625cc https://git.kernel.org/stable/c/c828fab903725279aa9dc6ae3d44bb7e4778f92c https://git.kernel.org/stable/c/12df140f0bdfae5dcfc81800970dd7f6f632e00c
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