{"schema_version":"1.9.0","id":"CVE-2024-49881","published":"2024-10-21T18:01:19.478Z","modified":"2026-08-12T03:51:16.162545539Z","related":["SUSE-SU-2024:3983-1","SUSE-SU-2024:3984-1","SUSE-SU-2024:3985-1","SUSE-SU-2024:4100-1","SUSE-SU-2024:4314-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:0034-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"summary":"ext4: update orig_path in ext4_find_extent()","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"10809df84a4d868db61af621bae3658494165279"},{"fixed":"ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff"},{"fixed":"6766937d0327000ac1b87c97bbecdd28b0dd6599"},{"fixed":"a9fcb1717d75061d3653ed69365c8d45331815cd"},{"fixed":"6801ed1298204d16a38571091e31178bfdc3c679"},{"fixed":"f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2"},{"fixed":"b63481b3a388ee2df9e295f97273226140422a42"},{"fixed":"11b230100d6801c014fab2afabc8bdea304c1b96"},{"fixed":"5b4b2dcace35f618fe361a87bae6f0d13af31bc1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49881.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.18.0"},{"fixed":"4.19.323"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.10.227"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.10.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.11.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49881.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49881.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49881"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49881.json"}}