cve-2024-49882
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:28
Severity ?
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 [...] ============================================
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/230ee0535d01478bad9a3037292043f39b9be10bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32bbb59e3f18facd7201bef110010bf35819b8c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68a69cf60660c73990c1875f94a5551600b04775Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7633407ca4ab8be2916ab214eb44ccebc6a50e1aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78bbc3d15b6f443acb26e94418c445bac940d414Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4574bda63906bf69660e001470bfe1a0ac524ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcaa6c31134c0f515600111c38ed7750003e1b9cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9fd47c9d9548f9e47fa60098eab99dde175401d
Impacted products
Vendor Product Version
Linux Linux Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
Version: ecb94f5fdf4b72547fca022421a9dca1672bddd4
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   Linux Linux Version: 3.7
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{
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      adp: [
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            metrics: [
               {
                  other: {
                     content: {
                        id: "CVE-2024-49882",
                        options: [
                           {
                              Exploitation: "none",
                           },
                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "partial",
                           },
                        ],
                        role: "CISA Coordinator",
                        timestamp: "2024-10-22T13:45:30.617937Z",
                        version: "2.0.3",
                     },
                     type: "ssvc",
                  },
               },
            ],
            providerMetadata: {
               dateUpdated: "2024-10-22T13:48:50.395Z",
               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
         },
      ],
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "fs/ext4/extents.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
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                     lessThan: "dcaa6c31134c0f515600111c38ed7750003e1b9c",
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                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "fs/ext4/extents.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "3.7",
                  },
                  {
                     lessThan: "3.7",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "4.19.*",
                     status: "unaffected",
                     version: "4.19.323",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.4.*",
                     status: "unaffected",
                     version: "5.4.285",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.10.*",
                     status: "unaffected",
                     version: "5.10.227",
                     versionType: "semver",
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                  {
                     lessThanOrEqual: "5.15.*",
                     status: "unaffected",
                     version: "5.15.168",
                     versionType: "semver",
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                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.113",
                     versionType: "semver",
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                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.55",
                     versionType: "semver",
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                     lessThanOrEqual: "6.10.*",
                     status: "unaffected",
                     version: "6.10.14",
                     versionType: "semver",
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                     lessThanOrEqual: "6.11.*",
                     status: "unaffected",
                     version: "6.11.3",
                     versionType: "semver",
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                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.12",
                     versionType: "original_commit_for_fix",
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         ],
         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============================================",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T09:28:17.697Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         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-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-49882",
      datePublished: "2024-10-21T18:01:20.144Z",
      dateReserved: "2024-10-21T12:17:06.021Z",
      dateUpdated: "2024-12-19T09:28:17.697Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-49882\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:10.790\",\"lastModified\":\"2024-11-08T16:15:30.123\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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============================================\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corregir el doble brelse() del búfer de la ruta de las extensiones En ext4_ext_try_to_merge_up(), establezca path[1].p_bh en NULL después de que se haya liberado, de lo contrario, puede liberarse dos veces. Un ejemplo de lo que desencadena esto es el siguiente: split2 map split1 |--------|-------|--------| ext4_ext_map_blocks ext4_ext_handle_unwritten_extents ext4_split_convert_extents // path-&gt;p_depth == 0 ext4_split_extent // 1. hacer split1 ext4_split_extent_at |ext4_ext_insert_extent | ext4_ext_create_new_leaf | ext4_ext_grow_indepth | le16_add_cpu(&amp;neh-&gt;eh_depth, 1) | ext4_find_extent | // devuelve -ENOMEM |// obtiene el error e intenta poner a cero |path = ext4_find_extent | path-&gt;p_depth = 1 |ext4_ext_try_to_merge | ext4_ext_try_to_merge_up | path-&gt;p_depth = 0 | brelse(path[1].p_bh) ---&gt; no establecido en NULL aquí |// puesta a cero exitosa // 2. actualizar ruta ext4_find_extent // 3. hacer split2 ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth le16_add_cpu(&amp;neh-&gt;eh_depth, 1) ext4_find_extent path[0].p_bh = NULL; path-&gt;p_depth = 1 read_extent_tree_block ---&gt; return err // path[1].p_bh sigue siendo el valor anterior ext4_free_ext_path ext4_ext_drop_refs // path-&gt;p_depth == 1 brelse(path[1].p_bh) ---&gt; brelse un buffer dos veces Finalmente obtuve la siguiente ADVERTENCIA al eliminar el buffer de lru: =============================================== VFS: brelse: Intentando liberar búfer libre ADVERTENCIA: CPU: 2 PID: 72 en fs/buffer.c:1241 __brelse+0x58/0x90 CPU: 2 PID: 72 Comm: kworker/u19:1 No contaminado 6.9.0-dirty #716 RIP: 0010:__brelse+0x58/0x90 Seguimiento de llamadas:  __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 [...] ============================================\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.7\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"3B73A13A-D7BE-4035-BEF2-2821D9D5CB6D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/230ee0535d01478bad9a3037292043f39b9be10b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/32bbb59e3f18facd7201bef110010bf35819b8c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/68a69cf60660c73990c1875f94a5551600b04775\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7633407ca4ab8be2916ab214eb44ccebc6a50e1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/78bbc3d15b6f443acb26e94418c445bac940d414\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d4574bda63906bf69660e001470bfe1a0ac524ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcaa6c31134c0f515600111c38ed7750003e1b9c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f9fd47c9d9548f9e47fa60098eab99dde175401d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:45:33.703Z\"}}], \"cna\": {\"title\": \"ext4: fix double brelse() the buffer of the extents path\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"d4574bda63906bf69660e001470bfe1a0ac524ae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"f9fd47c9d9548f9e47fa60098eab99dde175401d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"32bbb59e3f18facd7201bef110010bf35819b8c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"78bbc3d15b6f443acb26e94418c445bac940d414\", \"versionType\": \"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-5f407fcff5a0\"}, \"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============================================\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:28:17.697Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-49882\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:28:17.697Z\", \"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: "5.1",
      },
   },
}


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