{"id":"CVE-2024-49881","revision":"065fb9891d1c455486a06b3ac5ea8611","records":[{"revision":"065fb9891d1c455486a06b3ac5ea8611","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-49881","aliases":[],"title":"ext4: update orig_path in ext4_find_extent()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: update orig_path in ext4_find_extent()\n\nIn ext4_find_extent(), if the path is not big enough, we free it and set\n*orig_path to NULL. But after reallocating and successfully initializing\nthe path, we don't update *orig_path, in which case the caller gets a\nvalid path but a NULL ppath, and this may cause a NULL pointer dereference\nor a path memory leak. For example:\n\next4_split_extent\n  path = *ppath = 2000\n  ext4_find_extent\n    if (depth > path[0].p_maxdepth)\n      kfree(path = 2000);\n      *orig_path = path = NULL;\n      path = kcalloc() = 3000\n  ext4_split_extent_at(*ppath = NULL)\n    path = *ppath;\n    ex = path[depth].p_ext;\n    // NULL pointer dereference!\n\n==================================================================\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nCPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847\nRIP: 0010:ext4_split_extent_at+0x6d/0x560\nCall Trace:\n <TASK>\n ext4_split_extent.isra.0+0xcb/0x1b0\n ext4_ext_convert_to_initialized+0x168/0x6c0\n ext4_ext_handle_unwritten_extents+0x325/0x4d0\n ext4_ext_map_blocks+0x520/0xdb0\n ext4_map_blocks+0x2b0/0x690\n ext4_iomap_begin+0x20e/0x2c0\n[...]\n==================================================================\n\nTherefore, *orig_path is updated when the extent lookup succeeds, so that\nthe caller can safely use path or *ppath.","state":0,"publishedAt":"2024-10-21T18:01:19.478+00:00","modifiedAt":"2026-10-15T00:53:27.992+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ext4/extents.c\",\n                        \"fs/ext4/move_extent.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"6766937d0327000ac1b87c97bbecdd28b0dd6599\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"a9fcb1717d75061d3653ed69365c8d45331815cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"6801ed1298204d16a38571091e31178bfdc3c679\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"b63481b3a388ee2df9e295f97273226140422a42\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"11b230100d6801c014fab2afabc8bdea304c1b96\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"10809df84a4d868db61af621bae3658494165279\",\n                            \"lessThan\": \"5b4b2dcace35f618fe361a87bae6f0d13af31bc1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ext4/extents.c\",\n                        \"fs/ext4/move_extent.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.19.323\",\n                            \"lessThanOrEqual\": \"4.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.227\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.168\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.113\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.55\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10.14\",\n                            \"lessThanOrEqual\": \"6.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11.3\",\n                            \"lessThanOrEqual\": \"6.11.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff","https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599","https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd","https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679","https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2","https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42","https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96","https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-49881","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-49881","identifiers":["CVE-2024-49881"]},"retained":false,"historicalAffected":[]}],"coverage":[]}