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CVE-2022-49257 (GCVE-0-2022-49257)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:56 – Updated: 2026-05-11 18:56
VLAI
Title
watch_queue: Fix NULL dereference in error cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: watch_queue: Fix NULL dereference in error cleanup In watch_queue_set_size(), the error cleanup code doesn't take account of the fact that __free_page() can't handle a NULL pointer when trying to free up buffer pages that did get allocated. Fix this by only calling __free_page() on the pages actually allocated. Without the fix, this can lead to something like the following: BUG: KASAN: null-ptr-deref in __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 Read of size 4 at addr 0000000000000034 by task syz-executor168/3599 ... Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:446 [inline] kasan_report.cold+0x66/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] page_ref_count include/linux/page_ref.h:67 [inline] put_page_testzero include/linux/mm.h:717 [inline] __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 watch_queue_set_size+0x499/0x630 kernel/watch_queue.c:275 pipe_ioctl+0xac/0x2b0 fs/pipe.c:632 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 5ae75b4ed30322b42abaa75ef1b784addfdb7dc9 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 695c47cea02b9101e2fc2e7d36d552128592b347 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 112a2f9b0a8457794095a0450598f150724ec456 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < b6f5ad3e45d19f9c4ee3e8a2aff829f28d68591d (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < a635415a064e77bcfbf43da413fd9dfe0bbed9cb (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: watch_queue: Se corrige la desreferencia NULL en la limpieza de errores En watch_queue_set_size(), el c\u00f3digo de limpieza de errores no tiene en cuenta el hecho de que __free_page() no puede manejar un puntero NULL al intentar liberar p\u00e1ginas de b\u00fafer que s\u00ed se asignaron. Solucione esto llamando a __free_page() solo en las p\u00e1ginas realmente asignadas. Sin la correcci\u00f3n, esto puede llevar a algo como lo siguiente: ERROR: KASAN: null-ptr-deref en __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 Lectura de tama\u00f1o 4 en la direcci\u00f3n 0000000000000034 por la tarea syz-executor168/3599 ... Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:446 [en l\u00ednea] kasan_report.cold+0x66/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [en l\u00ednea] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [en l\u00ednea] atomic_read include/linux/atomic/atomic-instrumented.h:27 [en l\u00ednea] page_ref_count include/linux/page_ref.h:67 [en l\u00ednea] put_page_testzero include/linux/mm.h:717 [en l\u00ednea] __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 watch_queue_set_size+0x499/0x630 kernel/watch_queue.c:275 pipe_ioctl+0xac/0x2b0 fs/pipe.c:632 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:874 [en l\u00ednea] __se_sys_ioctl fs/ioctl.c:860 [en l\u00ednea] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [en l\u00ednea] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T19:06:02+00:00",
      "cve": "CVE-2022-49257",
      "id": "CVE-2022-49257",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: watch_queue: Fix NULL dereference in error cleanup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49257.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:29:19Z",
      "cve": "CVE-2022-49257",
      "id": "CVE-2022-49257",
      "initial_release_date": "2025-02-27T03:09:52Z",
      "product_status:known_not_affected": "402",
      "product_status:recommended": "192",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49257",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49257.json",
      "version": "39"
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.