CVE-2024-49882 (GCVE-0-2024-49882)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2025-11-03 22:22
VLAI?
Title
ext4: fix double brelse() the buffer of the extents path
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix double brelse() the buffer of the extents path In ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been released, otherwise it may be released twice. An example of what triggers this is as follows: split2 map split1 |--------|-------|--------| ext4_ext_map_blocks ext4_ext_handle_unwritten_extents ext4_split_convert_extents // path->p_depth == 0 ext4_split_extent // 1. do split1 ext4_split_extent_at |ext4_ext_insert_extent | ext4_ext_create_new_leaf | ext4_ext_grow_indepth | le16_add_cpu(&neh->eh_depth, 1) | ext4_find_extent | // return -ENOMEM |// get error and try zeroout |path = ext4_find_extent | path->p_depth = 1 |ext4_ext_try_to_merge | ext4_ext_try_to_merge_up | path->p_depth = 0 | brelse(path[1].p_bh) ---> not set to NULL here |// zeroout success // 2. update path ext4_find_extent // 3. do split2 ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth le16_add_cpu(&neh->eh_depth, 1) ext4_find_extent path[0].p_bh = NULL; path->p_depth = 1 read_extent_tree_block ---> return err // path[1].p_bh is still the old value ext4_free_ext_path ext4_ext_drop_refs // path->p_depth == 1 brelse(path[1].p_bh) ---> brelse a buffer twice Finally got the following WARRNING when removing the buffer from lru: ============================================ VFS: brelse: Trying to free free buffer WARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90 CPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716 RIP: 0010:__brelse+0x58/0x90 Call Trace: <TASK> __find_get_block+0x6e7/0x810 bdev_getblk+0x2b/0x480 __ext4_get_inode_loc+0x48a/0x1240 ext4_get_inode_loc+0xb2/0x150 ext4_reserve_inode_write+0xb7/0x230 __ext4_mark_inode_dirty+0x144/0x6a0 ext4_ext_insert_extent+0x9c8/0x3230 ext4_ext_map_blocks+0xf45/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ============================================
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < d4574bda63906bf69660e001470bfe1a0ac524ae (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < f9fd47c9d9548f9e47fa60098eab99dde175401d (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 32bbb59e3f18facd7201bef110010bf35819b8c3 (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 78bbc3d15b6f443acb26e94418c445bac940d414 (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 68a69cf60660c73990c1875f94a5551600b04775 (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 7633407ca4ab8be2916ab214eb44ccebc6a50e1a (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 230ee0535d01478bad9a3037292043f39b9be10b (git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < dcaa6c31134c0f515600111c38ed7750003e1b9c (git)
Create a notification for this product.
    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 4.19.323 , ≤ 4.19.* (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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-\u003ep_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(\u0026neh-\u003eeh_depth, 1)\n       |    ext4_find_extent\n       |      // return -ENOMEM\n       |// get error and try zeroout\n       |path = ext4_find_extent\n       |  path-\u003ep_depth = 1\n       |ext4_ext_try_to_merge\n       |  ext4_ext_try_to_merge_up\n       |    path-\u003ep_depth = 0\n       |    brelse(path[1].p_bh)  ---\u003e 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(\u0026neh-\u003eeh_depth, 1)\n           ext4_find_extent\n             path[0].p_bh = NULL;\n             path-\u003ep_depth = 1\n             read_extent_tree_block  ---\u003e return err\n             // path[1].p_bh is still the old value\n             ext4_free_ext_path\n               ext4_ext_drop_refs\n                 // path-\u003ep_depth == 1\n                 brelse(path[1].p_bh)  ---\u003e 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 \u003cTASK\u003e\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============================================"
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    "cveId": "CVE-2024-49882",
    "datePublished": "2024-10-21T18:01:20.144Z",
    "dateReserved": "2024-10-21T12:17:06.021Z",
    "dateUpdated": "2025-11-03T22:22:48.090Z",
    "state": "PUBLISHED"
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\"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"68a69cf60660c73990c1875f94a5551600b04775\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"7633407ca4ab8be2916ab214eb44ccebc6a50e1a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"230ee0535d01478bad9a3037292043f39b9be10b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"dcaa6c31134c0f515600111c38ed7750003e1b9c\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003ep_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(\u0026neh-\u003eeh_depth, 1)\\n       |    ext4_find_extent\\n       |      // return -ENOMEM\\n       |// get error and try zeroout\\n       |path = ext4_find_extent\\n       |  path-\u003ep_depth = 1\\n       |ext4_ext_try_to_merge\\n       |  ext4_ext_try_to_merge_up\\n       |    path-\u003ep_depth = 0\\n       |    brelse(path[1].p_bh)  ---\u003e 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(\u0026neh-\u003eeh_depth, 1)\\n           ext4_find_extent\\n             path[0].p_bh = NULL;\\n             path-\u003ep_depth = 1\\n             read_extent_tree_block  ---\u003e return err\\n             // path[1].p_bh is still the old value\\n             ext4_free_ext_path\\n               ext4_ext_drop_refs\\n                 // path-\u003ep_depth == 1\\n                 brelse(path[1].p_bh)  ---\u003e 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 \u003cTASK\u003e\\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============================================\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:40:17.799Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49882\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:22:48.090Z\", \"dateReserved\": \"2024-10-21T12:17:06.021Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:20.144Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.