{"id":"CVE-2022-49276","summary":"jffs2: fix memory leak in jffs2_scan_medium","details":"In the Linux kernel, the following vulnerability has been resolved:\n\njffs2: fix memory leak in jffs2_scan_medium\n\nIf an error is returned in jffs2_scan_eraseblock() and some memory\nhas been added to the jffs2_summary *s, we can observe the following\nkmemleak report:\n\n--------------------------------------------\nunreferenced object 0xffff88812b889c40 (size 64):\n  comm \"mount\", pid 692, jiffies 4294838325 (age 34.288s)\n  hex dump (first 32 bytes):\n    40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00  @H........1...P.\n    00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08  ................\n  backtrace:\n    [\u003cffffffffae93a3a3\u003e] __kmalloc+0x613/0x910\n    [\u003cffffffffaf423b9c\u003e] jffs2_sum_add_dirent_mem+0x5c/0xa0\n    [\u003cffffffffb0f3afa8\u003e] jffs2_scan_medium.cold+0x36e5/0x4794\n    [\u003cffffffffb0f3dbe1\u003e] jffs2_do_mount_fs.cold+0xa7/0x2267\n    [\u003cffffffffaf40acf3\u003e] jffs2_do_fill_super+0x383/0xc30\n    [\u003cffffffffaf40c00a\u003e] jffs2_fill_super+0x2ea/0x4c0\n    [\u003cffffffffb0315d64\u003e] mtd_get_sb+0x254/0x400\n    [\u003cffffffffb0315f5f\u003e] mtd_get_sb_by_nr+0x4f/0xd0\n    [\u003cffffffffb0316478\u003e] get_tree_mtd+0x498/0x840\n    [\u003cffffffffaf40bd15\u003e] jffs2_get_tree+0x25/0x30\n    [\u003cffffffffae9f358d\u003e] vfs_get_tree+0x8d/0x2e0\n    [\u003cffffffffaea7a98f\u003e] path_mount+0x50f/0x1e50\n    [\u003cffffffffaea7c3d7\u003e] do_mount+0x107/0x130\n    [\u003cffffffffaea7c5c5\u003e] __se_sys_mount+0x1c5/0x2f0\n    [\u003cffffffffaea7c917\u003e] __x64_sys_mount+0xc7/0x160\n    [\u003cffffffffb10142f5\u003e] do_syscall_64+0x45/0x70\nunreferenced object 0xffff888114b54840 (size 32):\n  comm \"mount\", pid 692, jiffies 4294838325 (age 34.288s)\n  hex dump (first 32 bytes):\n    c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00  .u..............\n    00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5  ......D...kkkkk.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423b04\u003e] jffs2_sum_add_inode_mem+0x54/0x90\n    [\u003cffffffffb0f3bd44\u003e] jffs2_scan_medium.cold+0x4481/0x4794\n    [...]\nunreferenced object 0xffff888114b57280 (size 32):\n  comm \"mount\", pid 692, jiffies 4294838393 (age 34.357s)\n  hex dump (first 32 bytes):\n    10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00  ..l.............\n    00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5  ..8...(...kkkkk.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423c34\u003e] jffs2_sum_add_xattr_mem+0x54/0x90\n    [\u003cffffffffb0f3a24f\u003e] jffs2_scan_medium.cold+0x298c/0x4794\n    [...]\nunreferenced object 0xffff8881116cd510 (size 16):\n  comm \"mount\", pid 692, jiffies 4294838395 (age 34.355s)\n  hex dump (first 16 bytes):\n    00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5  ..........`...k.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423cc4\u003e] jffs2_sum_add_xref_mem+0x54/0x90\n    [\u003cffffffffb0f3b2e3\u003e] jffs2_scan_medium.cold+0x3a20/0x4794\n    [...]\n--------------------------------------------\n\nTherefore, we should call jffs2_sum_reset_collected(s) on exit to\nrelease the memory added in s. In addition, a new tag \"out_buf\" is\nadded to prevent the NULL pointer reference caused by s being NULL.\n(thanks to Zhang Yi for this analysis)","modified":"2026-03-20T12:22:19.571695Z","published":"2025-02-26T01:56:20.559Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1241-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49276.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/455f4a23490bfcbedc8e5c245c463a59b19e5ddd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49276.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49276"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e631ddba588783edd521c5a89f7b2902772fb691"},{"fixed":"9b0c69182f09b70779817af4dcf89780955d5c4c"},{"fixed":"b36bccb04e14cc0c1e2d0e92d477fe220314fad6"},{"fixed":"e711913463af916d777a4873068f415f1fe2ad33"},{"fixed":"455f4a23490bfcbedc8e5c245c463a59b19e5ddd"},{"fixed":"51dbb5e36d59f62e34d462b801c1068248149cfe"},{"fixed":"52ba0ab4f0a606f02a6163493378989faa1ec10a"},{"fixed":"b26bbc0c122cad038831f226a4cb4de702225e16"},{"fixed":"82462324bf35b6b553400af1c1aa265069cee28f"},{"fixed":"9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49276.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}