{"id":"CVE-2022-50334","title":"hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nhugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()\n\nSyzkaller reports a null-ptr-deref bug as follows:\n======================================================\nKASA…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < fa71639873518e3587632ae58e25e4a96b57fa90","Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < dcd28191be9bbf307ba51a5b485773a55b0037c4","Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 9a8862820cbf1f18dca4f3b4c289d88561b3a384","Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd","Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < f2207145693ae5697a7b59e2add4b92f9e5b0e3c","Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 26215b7ee923b9251f7bb12c4e5f09dc465d35f2","Linux 5.1"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:10:15.500301Z"},"published":"2025-09-15","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:10:35.956Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50334","references":[{"url":"https://git.kernel.org/stable/c/fa71639873518e3587632ae58e25e4a96b57fa90"},{"url":"https://git.kernel.org/stable/c/dcd28191be9bbf307ba51a5b485773a55b0037c4"},{"url":"https://git.kernel.org/stable/c/9a8862820cbf1f18dca4f3b4c289d88561b3a384"},{"url":"https://git.kernel.org/stable/c/965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd"},{"url":"https://git.kernel.org/stable/c/f2207145693ae5697a7b59e2add4b92f9e5b0e3c"},{"url":"https://git.kernel.org/stable/c/26215b7ee923b9251f7bb12c4e5f09dc465d35f2"}],"tags":["cve.org"],"epss":0.0016,"epssPercentile":0.05155,"ingestedAt":"2026-11-05T22:38:31.728Z","slug":"CVE-2022-50334","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nhugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()\n\nSyzkaller reports a null-ptr-deref bug as follows:\n======================================================\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380\n[...]\nCall Trace:\n <TASK>\n vfs_parse_fs_param fs/fs_context.c:148 [inline]\n vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129\n vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191\n generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231\n do_new_mount fs/namespace.c:3036 [inline]\n path_mount+0x12de/0x1e20 fs/namespace.c:3370\n do_mount fs/namespace.c:3383 [inline]\n __do_sys_mount fs/namespace.c:3591 [inline]\n __se_sys_mount fs/namespace.c:3568 [inline]\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n </TASK>\n======================================================\n\nAccording to commit \"vfs: parse: deal with zero length string value\",\nkernel will set the param->string to null pointer in vfs_parse_fs_string()\nif fs string has zero length.\n\nYet the problem is that, hugetlbfs_parse_param() will dereference the\nparam->string, without checking whether it is a null pointer.  To be more\nspecific, if hugetlbfs_parse_param() parses an illegal mount parameter,\nsuch as \"size=,\", kernel will constructs struct fs_parameter with null\npointer in vfs_parse_fs_string(), then passes this struct fs_parameter to\nhugetlbfs_parse_param(), which triggers the above null-ptr-deref bug.\n\nThis patch solves it by adding sanity check on param->string\nin hugetlbfs_parse_param().\n\n## Affected\n\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < fa71639873518e3587632ae58e25e4a96b57fa90`\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < dcd28191be9bbf307ba51a5b485773a55b0037c4`\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 9a8862820cbf1f18dca4f3b4c289d88561b3a384`\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd`\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < f2207145693ae5697a7b59e2add4b92f9e5b0e3c`\n- `Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 26215b7ee923b9251f7bb12c4e5f09dc465d35f2`\n- `Linux 5.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}