| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "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" |
| }, |
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| "version": "ecb94f5fdf4b72547fca022421a9dca1672bddd4", |
| "lessThan": "f9fd47c9d9548f9e47fa60098eab99dde175401d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
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| "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, |
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| }, |
| { |
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| { |
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| "versionEndExcluding": "6.12" |
| } |
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| } |
| ], |
| "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" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-49882", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
