CVE-2021-47256 (GCVE-0-2021-47256)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2025-05-04 07:07
VLAI?
Title
mm/memory-failure: make sure wait for page writeback in memory_failure
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm/memory-failure: make sure wait for page writeback in memory_failure
Our syzkaller trigger the "BUG_ON(!list_empty(&inode->i_wb_list))" in
clear_inode:
kernel BUG at fs/inode.c:519!
Internal error: Oops - BUG: 0 [#1] SMP
Modules linked in:
Process syz-executor.0 (pid: 249, stack limit = 0x00000000a12409d7)
CPU: 1 PID: 249 Comm: syz-executor.0 Not tainted 4.19.95
Hardware name: linux,dummy-virt (DT)
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : clear_inode+0x280/0x2a8
lr : clear_inode+0x280/0x2a8
Call trace:
clear_inode+0x280/0x2a8
ext4_clear_inode+0x38/0xe8
ext4_free_inode+0x130/0xc68
ext4_evict_inode+0xb20/0xcb8
evict+0x1a8/0x3c0
iput+0x344/0x460
do_unlinkat+0x260/0x410
__arm64_sys_unlinkat+0x6c/0xc0
el0_svc_common+0xdc/0x3b0
el0_svc_handler+0xf8/0x160
el0_svc+0x10/0x218
Kernel panic - not syncing: Fatal exception
A crash dump of this problem show that someone called __munlock_pagevec
to clear page LRU without lock_page: do_mmap -> mmap_region -> do_munmap
-> munlock_vma_pages_range -> __munlock_pagevec.
As a result memory_failure will call identify_page_state without
wait_on_page_writeback. And after truncate_error_page clear the mapping
of this page. end_page_writeback won't call sb_clear_inode_writeback to
clear inode->i_wb_list. That will trigger BUG_ON in clear_inode!
Fix it by checking PageWriteback too to help determine should we skip
wait_on_page_writeback.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < d05267fd27a5c4f54e06daefa3035995d765ca0c
(git)
Affected: 0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < 6d210d547adc2218ef8b5bcf23518c5f2f1fd872 (git) Affected: 0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < 566345aaabac853aa866f53a219c4b02a6beb527 (git) Affected: 0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < 9e379da727a7a031be9b877cde7b9c34a0fb8306 (git) Affected: 0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < 28788dc5c70597395b6b451dae4549bbaa8e2c56 (git) Affected: 0bc1f8b0682caa39f45ce1e0228ebf43acb46111 , < e8675d291ac007e1c636870db880f837a9ea112a (git) |
|||||||
|
|||||||||
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47256\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:14.380\",\"lastModified\":\"2025-04-30T15:05:57.057\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/memory-failure: make sure wait for page writeback in memory_failure\\n\\nOur syzkaller trigger the \\\"BUG_ON(!list_empty(\u0026inode-\u003ei_wb_list))\\\" in\\nclear_inode:\\n\\n kernel BUG at fs/inode.c:519!\\n Internal error: Oops - BUG: 0 [#1] SMP\\n Modules linked in:\\n Process syz-executor.0 (pid: 249, stack limit = 0x00000000a12409d7)\\n CPU: 1 PID: 249 Comm: syz-executor.0 Not tainted 4.19.95\\n Hardware name: linux,dummy-virt (DT)\\n pstate: 80000005 (Nzcv daif -PAN -UAO)\\n pc : clear_inode+0x280/0x2a8\\n lr : clear_inode+0x280/0x2a8\\n Call trace:\\n clear_inode+0x280/0x2a8\\n ext4_clear_inode+0x38/0xe8\\n ext4_free_inode+0x130/0xc68\\n ext4_evict_inode+0xb20/0xcb8\\n evict+0x1a8/0x3c0\\n iput+0x344/0x460\\n do_unlinkat+0x260/0x410\\n __arm64_sys_unlinkat+0x6c/0xc0\\n el0_svc_common+0xdc/0x3b0\\n el0_svc_handler+0xf8/0x160\\n el0_svc+0x10/0x218\\n Kernel panic - not syncing: Fatal exception\\n\\nA crash dump of this problem show that someone called __munlock_pagevec\\nto clear page LRU without lock_page: do_mmap -\u003e mmap_region -\u003e do_munmap\\n-\u003e munlock_vma_pages_range -\u003e __munlock_pagevec.\\n\\nAs a result memory_failure will call identify_page_state without\\nwait_on_page_writeback. And after truncate_error_page clear the mapping\\nof this page. end_page_writeback won\u0027t call sb_clear_inode_writeback to\\nclear inode-\u003ei_wb_list. That will trigger BUG_ON in clear_inode!\\n\\nFix it by checking PageWriteback too to help determine should we skip\\nwait_on_page_writeback.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/memory-failure: aseg\u00farese de esperar la reescritura de la p\u00e1gina en Memory_failure. Nuestro syzkaller activa el \\\"BUG_ON(!list_empty(\u0026amp;inode-\u0026gt;i_wb_list))\\\" en clear_inode: kernel BUG en fs /inodo.c:519! Error interno: Oops - BUG: 0 [#1] M\u00f3dulos SMP vinculados en: Proceso syz-executor.0 (pid: 249, l\u00edmite de pila = 0x00000000a12409d7) CPU: 1 PID: 249 Comm: syz-executor.0 No contaminado 4.19. 95 Nombre de hardware: linux,dummy-virt (DT) pstate: 80000005 (Nzcv daif -PAN -UAO) pc: clear_inode+0x280/0x2a8 lr: clear_inode+0x280/0x2a8 Rastreo de llamadas: clear_inode+0x280/0x2a8 ext4_clear_inode+0x38/0xe8 ext4_free_inode+0x130/0xc68 ext4_evict_inode+0xb20/0xcb8 desalojar+0x1a8/0x3c0 iput+0x344/0x460 do_unlinkat+0x260/0x410 __arm64_sys_unlinkat+0x6c/0xc0 el0_svc_common+0xdc /0x3b0 el0_svc_handler+0xf8/0x160 el0_svc+0x10/0x218 P\u00e1nico del kernel: no se sincroniza : Excepci\u00f3n fatal Un volcado de memoria de este problema muestra que alguien llam\u00f3 a __munlock_pagevec para borrar la p\u00e1gina LRU sin lock_page: do_mmap -\u0026gt; mmap_region -\u0026gt; do_munmap -\u0026gt; munlock_vma_pages_range -\u0026gt; __munlock_pagevec. Como resultado, Memory_failure llamar\u00e1 a identify_page_state sin wait_on_page_writeback. Y despu\u00e9s de truncate_error_page, borre el mapeo de esta p\u00e1gina. end_page_writeback no llamar\u00e1 a sb_clear_inode_writeback para borrar inode-\u0026gt;i_wb_list. \u00a1Eso activar\u00e1 BUG_ON en clear_inode! Solucionarlo marcando tambi\u00e9n PageWriteback para ayudar a determinar si debemos omitir wait_on_page_writeback.\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16\",\"versionEndExcluding\":\"4.14.238\",\"matchCriteriaId\":\"CC6F60EE-EF5A-4213-9927-5F26053B4B41\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.196\",\"matchCriteriaId\":\"F3CAB837-7D38-4934-AD4F-195CEFD754E6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.128\",\"matchCriteriaId\":\"6267BD4E-BE25-48B5-B850-4B493440DAFA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.46\",\"matchCriteriaId\":\"59455D13-A902-42E1-97F7-5ED579777193\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.12.13\",\"matchCriteriaId\":\"7806E7E5-6D4F-4E18-81C1-79B3C60EE855\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"96AC23B2-D46A-49D9-8203-8E1BEDCA8532\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DA610E30-717C-4700-9F77-A3C9244F3BFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1ECD33F5-85BE-430B-8F86-8D7BD560311D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CF351855-2437-4CF5-AD7C-BDFA51F27683\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"25A855BA-2118-44F2-90EF-EBBB12AF51EF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/28788dc5c70597395b6b451dae4549bbaa8e2c56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/566345aaabac853aa866f53a219c4b02a6beb527\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d210d547adc2218ef8b5bcf23518c5f2f1fd872\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9e379da727a7a031be9b877cde7b9c34a0fb8306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d05267fd27a5c4f54e06daefa3035995d765ca0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8675d291ac007e1c636870db880f837a9ea112a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/28788dc5c70597395b6b451dae4549bbaa8e2c56\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/566345aaabac853aa866f53a219c4b02a6beb527\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d210d547adc2218ef8b5bcf23518c5f2f1fd872\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9e379da727a7a031be9b877cde7b9c34a0fb8306\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d05267fd27a5c4f54e06daefa3035995d765ca0c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8675d291ac007e1c636870db880f837a9ea112a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d05267fd27a5c4f54e06daefa3035995d765ca0c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6d210d547adc2218ef8b5bcf23518c5f2f1fd872\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/566345aaabac853aa866f53a219c4b02a6beb527\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9e379da727a7a031be9b877cde7b9c34a0fb8306\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/28788dc5c70597395b6b451dae4549bbaa8e2c56\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/e8675d291ac007e1c636870db880f837a9ea112a\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:07.937Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47256\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:39:51.420544Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:15.259Z\"}}], \"cna\": {\"title\": \"mm/memory-failure: make sure wait for page writeback in memory_failure\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"d05267fd27a5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"6d210d547adc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"566345aaabac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"9e379da727a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"28788dc5c705\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bc1f8b0682c\", \"lessThan\": \"e8675d291ac0\", \"versionType\": \"git\"}], \"programFiles\": [\"mm/memory-failure.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.238\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.196\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/memory-failure.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d05267fd27a5c4f54e06daefa3035995d765ca0c\"}, {\"url\": \"https://git.kernel.org/stable/c/6d210d547adc2218ef8b5bcf23518c5f2f1fd872\"}, {\"url\": \"https://git.kernel.org/stable/c/566345aaabac853aa866f53a219c4b02a6beb527\"}, {\"url\": \"https://git.kernel.org/stable/c/9e379da727a7a031be9b877cde7b9c34a0fb8306\"}, {\"url\": \"https://git.kernel.org/stable/c/28788dc5c70597395b6b451dae4549bbaa8e2c56\"}, {\"url\": \"https://git.kernel.org/stable/c/e8675d291ac007e1c636870db880f837a9ea112a\"}], \"x_generator\": {\"engine\": \"bippy-c8e10e5f6187\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/memory-failure: make sure wait for page writeback in memory_failure\\n\\nOur syzkaller trigger the \\\"BUG_ON(!list_empty(\u0026inode-\u003ei_wb_list))\\\" in\\nclear_inode:\\n\\n kernel BUG at fs/inode.c:519!\\n Internal error: Oops - BUG: 0 [#1] SMP\\n Modules linked in:\\n Process syz-executor.0 (pid: 249, stack limit = 0x00000000a12409d7)\\n CPU: 1 PID: 249 Comm: syz-executor.0 Not tainted 4.19.95\\n Hardware name: linux,dummy-virt (DT)\\n pstate: 80000005 (Nzcv daif -PAN -UAO)\\n pc : clear_inode+0x280/0x2a8\\n lr : clear_inode+0x280/0x2a8\\n Call trace:\\n clear_inode+0x280/0x2a8\\n ext4_clear_inode+0x38/0xe8\\n ext4_free_inode+0x130/0xc68\\n ext4_evict_inode+0xb20/0xcb8\\n evict+0x1a8/0x3c0\\n iput+0x344/0x460\\n do_unlinkat+0x260/0x410\\n __arm64_sys_unlinkat+0x6c/0xc0\\n el0_svc_common+0xdc/0x3b0\\n el0_svc_handler+0xf8/0x160\\n el0_svc+0x10/0x218\\n Kernel panic - not syncing: Fatal exception\\n\\nA crash dump of this problem show that someone called __munlock_pagevec\\nto clear page LRU without lock_page: do_mmap -\u003e mmap_region -\u003e do_munmap\\n-\u003e munlock_vma_pages_range -\u003e __munlock_pagevec.\\n\\nAs a result memory_failure will call identify_page_state without\\nwait_on_page_writeback. And after truncate_error_page clear the mapping\\nof this page. end_page_writeback won\u0027t call sb_clear_inode_writeback to\\nclear inode-\u003ei_wb_list. That will trigger BUG_ON in clear_inode!\\n\\nFix it by checking PageWriteback too to help determine should we skip\\nwait_on_page_writeback.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T11:37:43.331Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47256\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T11:37:43.331Z\", \"dateReserved\": \"2024-04-10T18:59:19.540Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:50.777Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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.
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