Show plain JSON{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-49882", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.021Z", "datePublished": "2024-10-21T18:01:20.144Z", "dateUpdated": "2025-05-04T09:40:17.799Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T09:40:17.799Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix double brelse() the buffer of the extents path\n\nIn ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been\nreleased, otherwise it may be released twice. An example of what triggers\nthis is as follows:\n\n split2 map split1\n|--------|-------|--------|\n\next4_ext_map_blocks\n ext4_ext_handle_unwritten_extents\n ext4_split_convert_extents\n // path->p_depth == 0\n ext4_split_extent\n // 1. do split1\n ext4_split_extent_at\n |ext4_ext_insert_extent\n | ext4_ext_create_new_leaf\n | ext4_ext_grow_indepth\n | le16_add_cpu(&neh->eh_depth, 1)\n | ext4_find_extent\n | // return -ENOMEM\n |// get error and try zeroout\n |path = ext4_find_extent\n | path->p_depth = 1\n |ext4_ext_try_to_merge\n | ext4_ext_try_to_merge_up\n | path->p_depth = 0\n | brelse(path[1].p_bh) ---> not set to NULL here\n |// zeroout success\n // 2. update path\n ext4_find_extent\n // 3. do split2\n ext4_split_extent_at\n ext4_ext_insert_extent\n ext4_ext_create_new_leaf\n ext4_ext_grow_indepth\n le16_add_cpu(&neh->eh_depth, 1)\n ext4_find_extent\n path[0].p_bh = NULL;\n path->p_depth = 1\n read_extent_tree_block ---> return err\n // path[1].p_bh is still the old value\n ext4_free_ext_path\n ext4_ext_drop_refs\n // path->p_depth == 1\n brelse(path[1].p_bh) ---> brelse a buffer twice\n\nFinally got the following WARRNING when removing the buffer from lru:\n\n============================================\nVFS: brelse: Trying to free free buffer\nWARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90\nCPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716\nRIP: 0010:__brelse+0x58/0x90\nCall Trace:\n <TASK>\n __find_get_block+0x6e7/0x810\n bdev_getblk+0x2b/0x480\n __ext4_get_inode_loc+0x48a/0x1240\n ext4_get_inode_loc+0xb2/0x150\n ext4_reserve_inode_write+0xb7/0x230\n __ext4_mark_inode_dirty+0x144/0x6a0\n ext4_ext_insert_extent+0x9c8/0x3230\n ext4_ext_map_blocks+0xf45/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n============================================"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "d4574bda63906bf69660e001470bfe1a0ac524ae", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "f9fd47c9d9548f9e47fa60098eab99dde175401d", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "32bbb59e3f18facd7201bef110010bf35819b8c3", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "78bbc3d15b6f443acb26e94418c445bac940d414", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "68a69cf60660c73990c1875f94a5551600b04775", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "7633407ca4ab8be2916ab214eb44ccebc6a50e1a", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "230ee0535d01478bad9a3037292043f39b9be10b", "status": "affected", "versionType": "git"}, {"version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", "lessThan": "dcaa6c31134c0f515600111c38ed7750003e1b9c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "3.7", "status": "affected"}, {"version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.323", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "4.19.323"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.4.285"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.10.227"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.15.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.1.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.6.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.10.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.11.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d4574bda63906bf69660e001470bfe1a0ac524ae"}, {"url": "https://git.kernel.org/stable/c/f9fd47c9d9548f9e47fa60098eab99dde175401d"}, {"url": "https://git.kernel.org/stable/c/b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e"}, {"url": "https://git.kernel.org/stable/c/32bbb59e3f18facd7201bef110010bf35819b8c3"}, {"url": "https://git.kernel.org/stable/c/78bbc3d15b6f443acb26e94418c445bac940d414"}, {"url": "https://git.kernel.org/stable/c/68a69cf60660c73990c1875f94a5551600b04775"}, {"url": "https://git.kernel.org/stable/c/7633407ca4ab8be2916ab214eb44ccebc6a50e1a"}, {"url": "https://git.kernel.org/stable/c/230ee0535d01478bad9a3037292043f39b9be10b"}, {"url": "https://git.kernel.org/stable/c/dcaa6c31134c0f515600111c38ed7750003e1b9c"}], "title": "ext4: fix double brelse() the buffer of the extents path", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49882", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:45:30.617937Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:48:50.395Z"}}]}}