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CVE-2021-47492 (GCVE-0-2021-47492)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-08-05 08:48
VLAI
Title
mm, thp: bail out early in collapse_file for writeback page
Summary
In the Linux kernel, the following vulnerability has been resolved: mm, thp: bail out early in collapse_file for writeback page Currently collapse_file does not explicitly check PG_writeback, instead, page_has_private and try_to_release_page are used to filter writeback pages. This does not work for xfs with blocksize equal to or larger than pagesize, because in such case xfs has no page->private. This makes collapse_file bail out early for writeback page. Otherwise, xfs end_page_writeback will panic as follows. page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32 aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:"libtest.so" flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback) raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000 page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u <= 127u)) page->mem_cgroup:ffff0000c3e9a000 ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1212! Internal error: Oops - BUG: 0 [#1] SMP Modules linked in: BUG: Bad page state in process khugepaged pfn:84ef32 xfs(E) page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32 libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ... CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ... pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) Call trace: end_page_writeback+0x1c0/0x214 iomap_finish_page_writeback+0x13c/0x204 iomap_finish_ioend+0xe8/0x19c iomap_writepage_end_bio+0x38/0x50 bio_endio+0x168/0x1ec blk_update_request+0x278/0x3f0 blk_mq_end_request+0x34/0x15c virtblk_request_done+0x38/0x74 [virtio_blk] blk_done_softirq+0xc4/0x110 __do_softirq+0x128/0x38c __irq_exit_rcu+0x118/0x150 irq_exit+0x1c/0x30 __handle_domain_irq+0x8c/0xf0 gic_handle_irq+0x84/0x108 el1_irq+0xcc/0x180 arch_cpu_idle+0x18/0x40 default_idle_call+0x4c/0x1a0 cpuidle_idle_call+0x168/0x1e0 do_idle+0xb4/0x104 cpu_startup_entry+0x30/0x9c secondary_start_kernel+0x104/0x180 Code: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f8c ]--- Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 19:45 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 , < 69a7fa5cb0de06c8956b040f19a7248c8c8308ca (git)
Affected: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 , < 5e669d8ab30ab61dec3c36e27b4711f07611e6fc (git)
Affected: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 , < 74c42e1baacf206338b1dd6b6199ac964512b5bb (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm, thp: bail out early in collapse_file for writeback page\n\nCurrently collapse_file does not explicitly check PG_writeback, instead,\npage_has_private and try_to_release_page are used to filter writeback\npages.  This does not work for xfs with blocksize equal to or larger\nthan pagesize, because in such case xfs has no page-\u003eprivate.\n\nThis makes collapse_file bail out early for writeback page.  Otherwise,\nxfs end_page_writeback will panic as follows.\n\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\"libtest.so\"\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\n  page-\u003emem_cgroup:ffff0000c3e9a000\n  ------------[ cut here ]------------\n  kernel BUG at include/linux/mm.h:1212!\n  Internal error: Oops - BUG: 0 [#1] SMP\n  Modules linked in:\n  BUG: Bad page state in process khugepaged  pfn:84ef32\n   xfs(E)\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\n  Call trace:\n    end_page_writeback+0x1c0/0x214\n    iomap_finish_page_writeback+0x13c/0x204\n    iomap_finish_ioend+0xe8/0x19c\n    iomap_writepage_end_bio+0x38/0x50\n    bio_endio+0x168/0x1ec\n    blk_update_request+0x278/0x3f0\n    blk_mq_end_request+0x34/0x15c\n    virtblk_request_done+0x38/0x74 [virtio_blk]\n    blk_done_softirq+0xc4/0x110\n    __do_softirq+0x128/0x38c\n    __irq_exit_rcu+0x118/0x150\n    irq_exit+0x1c/0x30\n    __handle_domain_irq+0x8c/0xf0\n    gic_handle_irq+0x84/0x108\n    el1_irq+0xcc/0x180\n    arch_cpu_idle+0x18/0x40\n    default_idle_call+0x4c/0x1a0\n    cpuidle_idle_call+0x168/0x1e0\n    do_idle+0xb4/0x104\n    cpu_startup_entry+0x30/0x9c\n    secondary_start_kernel+0x104/0x180\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\n  ---[ end trace 4a88c6a074082f8c ]---\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt"
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    "dateUpdated": "2026-08-05T08:48:02.710Z",
    "state": "PUBLISHED"
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, thp: bail out early in collapse_file for writeback page\\n\\nCurrently collapse_file does not explicitly check PG_writeback, instead,\\npage_has_private and try_to_release_page are used to filter writeback\\npages.  This does not work for xfs with blocksize equal to or larger\\nthan pagesize, because in such case xfs has no page-\u003eprivate.\\n\\nThis makes collapse_file bail out early for writeback page.  Otherwise,\\nxfs end_page_writeback will panic as follows.\\n\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\\\"libtest.so\\\"\\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\\n  page-\u003emem_cgroup:ffff0000c3e9a000\\n  ------------[ cut here ]------------\\n  kernel BUG at include/linux/mm.h:1212!\\n  Internal error: Oops - BUG: 0 [#1] SMP\\n  Modules linked in:\\n  BUG: Bad page state in process khugepaged  pfn:84ef32\\n   xfs(E)\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\\n  Call trace:\\n    end_page_writeback+0x1c0/0x214\\n    iomap_finish_page_writeback+0x13c/0x204\\n    iomap_finish_ioend+0xe8/0x19c\\n    iomap_writepage_end_bio+0x38/0x50\\n    bio_endio+0x168/0x1ec\\n    blk_update_request+0x278/0x3f0\\n    blk_mq_end_request+0x34/0x15c\\n    virtblk_request_done+0x38/0x74 [virtio_blk]\\n    blk_done_softirq+0xc4/0x110\\n    __do_softirq+0x128/0x38c\\n    __irq_exit_rcu+0x118/0x150\\n    irq_exit+0x1c/0x30\\n    __handle_domain_irq+0x8c/0xf0\\n    gic_handle_irq+0x84/0x108\\n    el1_irq+0xcc/0x180\\n    arch_cpu_idle+0x18/0x40\\n    default_idle_call+0x4c/0x1a0\\n    cpuidle_idle_call+0x168/0x1e0\\n    do_idle+0xb4/0x104\\n    cpu_startup_entry+0x30/0x9c\\n    secondary_start_kernel+0x104/0x180\\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\\n  ---[ end trace 4a88c6a074082f8c ]---\\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm, thp: rescatar temprano en el colapso_archivo para la p\\u00e1gina de reescritura. Actualmente, colapso_archivo no verifica expl\\u00edcitamente PG_writeback; en su lugar, page_has_private y try_to_release_page se utilizan para filtrar las p\\u00e1ginas de reescritura. Esto no funciona para xfs con un tama\\u00f1o de bloque igual o mayor que el tama\\u00f1o de p\\u00e1gina, porque en tal caso xfs no tiene p\\u00e1gina-\u0026gt;privada. Esto hace que colapso_file salga anticipadamente de la p\\u00e1gina de reescritura. De lo contrario, xfs end_page_writeback entrar\\u00e1 en p\\u00e1nico de la siguiente manera. p\\u00e1gina:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:ffff0003f88c86a8 \\u00edndice:0x0 pfn:0x84ef32 aops:xfs_address_space_operaciones [xfs] ino:30000b7 nombre dentry:\\\"libtest.so\\\" banderas: 0x57fffe0000008027(bloqueado|referenciado| actualizaci\\u00f3n|activo|reescritura) sin formato : 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 crudo: 0000000000000000 00000000000000000 00000000ffffffff p\\u00e1gina volcada porque: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u0026lt;= 127u)) page-\u0026gt;mem_cgroup:ffff0000c3e9a000 ----------- -[ cortar aqu\\u00ed ]------------ \\u00a1ERROR del kernel en include/linux/mm.h:1212! Error interno: Ups - ERROR: 0 [#1] M\\u00f3dulos SMP vinculados en: ERROR: Estado de p\\u00e1gina incorrecto en el proceso khugepaged pfn:84ef32 xfs(E) page:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:0 index:0x0 pfn:0x84ef32 libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ... CPU: 25 PID: 0 Comm: swapper/25 Kdump: cargado Contaminado: ... pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) Seguimiento de llamadas: end_page_writeback+0x1c0/0x214 iomap_finish_page_writeback+0x13c/0x204 iomap_finish_ioend+0xe8/0x19c iomap_writepage_end_bio+0x38/0x50 bio_endio+0x168/0x1ec blk_update_request+0x278/0x 3f0 blk_mq_end_request+0x34/0x15c virtblk_request_done+0x38/0x74 [virtio_blk ] blk_done_softirq+0xc4/0x110 __do_softirq+0x128/0x38c __irq_exit_rcu+0x118/0x150 irq_exit+0x1c/0x30 __handle_domain_irq+0x8c/0xf0 gic_handle_irq+0x84/0x108 xcc/0x180 arch_cpu_idle+0x18/0x40 default_idle_call+0x4c/0x1a0 cpuidle_idle_call+0x168/ 0x1e0 do_idle+0xb4/0x104 cpu_startup_entry+0x30/0x9c second_start_kernel+0x104/0x180 C\\u00f3digo: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f 8c ]--- P\\u00e1nico en el kernel - no se sincroniza: Ups - ERROR: excepci\\u00f3n fatal en la interrupci\\u00f3n\"}]",
      "id": "CVE-2021-47492",
      "lastModified": "2024-11-21T06:36:19.453",
      "published": "2024-05-22T09:15:11.030",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47492\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T09:15:11.030\",\"lastModified\":\"2026-08-04T10:17:05.447\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, thp: bail out early in collapse_file for writeback page\\n\\nCurrently collapse_file does not explicitly check PG_writeback, instead,\\npage_has_private and try_to_release_page are used to filter writeback\\npages.  This does not work for xfs with blocksize equal to or larger\\nthan pagesize, because in such case xfs has no page-\u003eprivate.\\n\\nThis makes collapse_file bail out early for writeback page.  Otherwise,\\nxfs end_page_writeback will panic as follows.\\n\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\\\"libtest.so\\\"\\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\\n  page-\u003emem_cgroup:ffff0000c3e9a000\\n  ------------[ cut here ]------------\\n  kernel BUG at include/linux/mm.h:1212!\\n  Internal error: Oops - BUG: 0 [#1] SMP\\n  Modules linked in:\\n  BUG: Bad page state in process khugepaged  pfn:84ef32\\n   xfs(E)\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\\n  Call trace:\\n    end_page_writeback+0x1c0/0x214\\n    iomap_finish_page_writeback+0x13c/0x204\\n    iomap_finish_ioend+0xe8/0x19c\\n    iomap_writepage_end_bio+0x38/0x50\\n    bio_endio+0x168/0x1ec\\n    blk_update_request+0x278/0x3f0\\n    blk_mq_end_request+0x34/0x15c\\n    virtblk_request_done+0x38/0x74 [virtio_blk]\\n    blk_done_softirq+0xc4/0x110\\n    __do_softirq+0x128/0x38c\\n    __irq_exit_rcu+0x118/0x150\\n    irq_exit+0x1c/0x30\\n    __handle_domain_irq+0x8c/0xf0\\n    gic_handle_irq+0x84/0x108\\n    el1_irq+0xcc/0x180\\n    arch_cpu_idle+0x18/0x40\\n    default_idle_call+0x4c/0x1a0\\n    cpuidle_idle_call+0x168/0x1e0\\n    do_idle+0xb4/0x104\\n    cpu_startup_entry+0x30/0x9c\\n    secondary_start_kernel+0x104/0x180\\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\\n  ---[ end trace 4a88c6a074082f8c ]---\\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm, thp: rescatar temprano en el colapso_archivo para la p\u00e1gina de reescritura. Actualmente, colapso_archivo no verifica expl\u00edcitamente PG_writeback; en su lugar, page_has_private y try_to_release_page se utilizan para filtrar las p\u00e1ginas de reescritura. Esto no funciona para xfs con un tama\u00f1o de bloque igual o mayor que el tama\u00f1o de p\u00e1gina, porque en tal caso xfs no tiene p\u00e1gina-\u0026gt;privada. Esto hace que colapso_file salga anticipadamente de la p\u00e1gina de reescritura. De lo contrario, xfs end_page_writeback entrar\u00e1 en p\u00e1nico de la siguiente manera. p\u00e1gina:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:ffff0003f88c86a8 \u00edndice:0x0 pfn:0x84ef32 aops:xfs_address_space_operaciones [xfs] ino:30000b7 nombre dentry:\\\"libtest.so\\\" banderas: 0x57fffe0000008027(bloqueado|referenciado| actualizaci\u00f3n|activo|reescritura) sin formato : 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 crudo: 0000000000000000 00000000000000000 00000000ffffffff p\u00e1gina volcada porque: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u0026lt;= 127u)) page-\u0026gt;mem_cgroup:ffff0000c3e9a000 ----------- -[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en include/linux/mm.h:1212! Error interno: Ups - ERROR: 0 [#1] M\u00f3dulos SMP vinculados en: ERROR: Estado de p\u00e1gina incorrecto en el proceso khugepaged pfn:84ef32 xfs(E) page:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:0 index:0x0 pfn:0x84ef32 libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ... CPU: 25 PID: 0 Comm: swapper/25 Kdump: cargado Contaminado: ... pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) Seguimiento de llamadas: end_page_writeback+0x1c0/0x214 iomap_finish_page_writeback+0x13c/0x204 iomap_finish_ioend+0xe8/0x19c iomap_writepage_end_bio+0x38/0x50 bio_endio+0x168/0x1ec blk_update_request+0x278/0x 3f0 blk_mq_end_request+0x34/0x15c virtblk_request_done+0x38/0x74 [virtio_blk ] blk_done_softirq+0xc4/0x110 __do_softirq+0x128/0x38c __irq_exit_rcu+0x118/0x150 irq_exit+0x1c/0x30 __handle_domain_irq+0x8c/0xf0 gic_handle_irq+0x84/0x108 xcc/0x180 arch_cpu_idle+0x18/0x40 default_idle_call+0x4c/0x1a0 cpuidle_idle_call+0x168/ 0x1e0 do_idle+0xb4/0x104 cpu_startup_entry+0x30/0x9c second_start_kernel+0x104/0x180 C\u00f3digo: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f 8c ]--- P\u00e1nico en el kernel - no se sincroniza: Ups - ERROR: excepci\u00f3n fatal en la interrupci\u00f3n\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/khugepaged.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\",\"lessThan\":\"69a7fa5cb0de06c8956b040f19a7248c8c8308ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\",\"lessThan\":\"5e669d8ab30ab61dec3c36e27b4711f07611e6fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\",\"lessThan\":\"74c42e1baacf206338b1dd6b6199ac964512b5bb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/khugepaged.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.77\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14.16\",\"lessThanOrEqual\":\"5.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"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},{\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-22T19:45:29.189112Z\",\"id\":\"CVE-2021-47492\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"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\":\"5.4\",\"versionEndExcluding\":\"5.10.77\",\"matchCriteriaId\":\"6EF3E26D-A1EF-4DE4-B0D3-23ADF141E2C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.14.16\",\"matchCriteriaId\":\"2681B950-4548-4649-A9E1-4124B59FC09C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"60134C3A-06E4-48C1-B04F-2903732A4E56\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0460DA88-8FE1-46A2-9DDA-1F1ABA552E71\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"AF55383D-4DF2-45DC-93F7-571F4F978EAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"EBD45831-4B79-42BC-ABC0-86870F0DEA89\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"948A6B8D-1B72-4945-8680-354E53BE1C80\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:56:49+00:00",
      "cve": "CVE-2021-47492",
      "id": "CVE-2021-47492",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "146",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm, thp: bail out early in collapse_file for writeback page",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47492.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T00:01:29Z",
      "cve": "CVE-2021-47492",
      "id": "CVE-2021-47492",
      "initial_release_date": "2024-05-23T03:04:25Z",
      "product_status:known_affected": "354",
      "product_status:known_not_affected": "266",
      "product_status:recommended": "373",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47492",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47492.json",
      "version": "57"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.622Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47492\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-22T19:45:29.189112Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-22T19:46:35.388Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"mm, thp: bail out early in collapse_file for writeback page\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\", \"lessThan\": \"69a7fa5cb0de06c8956b040f19a7248c8c8308ca\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\", \"lessThan\": \"5e669d8ab30ab61dec3c36e27b4711f07611e6fc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0\", \"lessThan\": \"74c42e1baacf206338b1dd6b6199ac964512b5bb\", \"versionType\": \"git\"}], \"programFiles\": [\"mm/khugepaged.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/khugepaged.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\"}, {\"url\": \"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\"}, {\"url\": \"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, thp: bail out early in collapse_file for writeback page\\n\\nCurrently collapse_file does not explicitly check PG_writeback, instead,\\npage_has_private and try_to_release_page are used to filter writeback\\npages.  This does not work for xfs with blocksize equal to or larger\\nthan pagesize, because in such case xfs has no page-\u003eprivate.\\n\\nThis makes collapse_file bail out early for writeback page.  Otherwise,\\nxfs end_page_writeback will panic as follows.\\n\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\\\"libtest.so\\\"\\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\\n  page-\u003emem_cgroup:ffff0000c3e9a000\\n  ------------[ cut here ]------------\\n  kernel BUG at include/linux/mm.h:1212!\\n  Internal error: Oops - BUG: 0 [#1] SMP\\n  Modules linked in:\\n  BUG: Bad page state in process khugepaged  pfn:84ef32\\n   xfs(E)\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\\n  Call trace:\\n    end_page_writeback+0x1c0/0x214\\n    iomap_finish_page_writeback+0x13c/0x204\\n    iomap_finish_ioend+0xe8/0x19c\\n    iomap_writepage_end_bio+0x38/0x50\\n    bio_endio+0x168/0x1ec\\n    blk_update_request+0x278/0x3f0\\n    blk_mq_end_request+0x34/0x15c\\n    virtblk_request_done+0x38/0x74 [virtio_blk]\\n    blk_done_softirq+0xc4/0x110\\n    __do_softirq+0x128/0x38c\\n    __irq_exit_rcu+0x118/0x150\\n    irq_exit+0x1c/0x30\\n    __handle_domain_irq+0x8c/0xf0\\n    gic_handle_irq+0x84/0x108\\n    el1_irq+0xcc/0x180\\n    arch_cpu_idle+0x18/0x40\\n    default_idle_call+0x4c/0x1a0\\n    cpuidle_idle_call+0x168/0x1e0\\n    do_idle+0xb4/0x104\\n    cpu_startup_entry+0x30/0x9c\\n    secondary_start_kernel+0x104/0x180\\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\\n  ---[ end trace 4a88c6a074082f8c ]---\\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.77\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.16\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-04T09:00:57.207Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47492\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-04T09:00:57.207Z\", \"dateReserved\": \"2024-05-22T06:20:56.201Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:40.759Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.