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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: Fix NULL dereference in error cleanup\n\nIn watch_queue_set_size(), the error cleanup code doesn\u0027t take account of\nthe fact that __free_page() can\u0027t handle a NULL pointer when trying to free\nup buffer pages that did get allocated.\n\nFix this by only calling __free_page() on the pages actually allocated.\n\nWithout the fix, this can lead to something like the following:\n\nBUG: KASAN: null-ptr-deref in __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473\nRead of size 4 at addr 0000000000000034 by task syz-executor168/3599\n...\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n __kasan_report mm/kasan/report.c:446 [inline]\n kasan_report.cold+0x66/0xdf mm/kasan/report.c:459\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189\n instrument_atomic_read include/linux/instrumented.h:71 [inline]\n atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]\n page_ref_count include/linux/page_ref.h:67 [inline]\n put_page_testzero include/linux/mm.h:717 [inline]\n __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473\n watch_queue_set_size+0x499/0x630 kernel/watch_queue.c:275\n pipe_ioctl+0xac/0x2b0 fs/pipe.c:632\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:874 [inline]\n __se_sys_ioctl fs/ioctl.c:860 [inline]\n __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2022-49257",
    "datePublished": "2025-02-26T01:56:11.072Z",
    "dateReserved": "2025-02-26T01:49:39.296Z",
    "dateUpdated": "2026-05-11T18:56:12.623Z",
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      "date": "2026-05-20",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49257\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:02.597\",\"lastModified\":\"2025-09-22T20:56:14.770\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwatch_queue: Fix NULL dereference in error cleanup\\n\\nIn watch_queue_set_size(), the error cleanup code doesn\u0027t take account of\\nthe fact that __free_page() can\u0027t handle a NULL pointer when trying to free\\nup buffer pages that did get allocated.\\n\\nFix this by only calling __free_page() on the pages actually allocated.\\n\\nWithout the fix, this can lead to something like the following:\\n\\nBUG: KASAN: null-ptr-deref in __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473\\nRead of size 4 at addr 0000000000000034 by task syz-executor168/3599\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\\n __kasan_report mm/kasan/report.c:446 [inline]\\n kasan_report.cold+0x66/0xdf mm/kasan/report.c:459\\n check_region_inline mm/kasan/generic.c:183 [inline]\\n kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189\\n instrument_atomic_read include/linux/instrumented.h:71 [inline]\\n atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]\\n page_ref_count include/linux/page_ref.h:67 [inline]\\n put_page_testzero include/linux/mm.h:717 [inline]\\n __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473\\n watch_queue_set_size+0x499/0x630 kernel/watch_queue.c:275\\n pipe_ioctl+0xac/0x2b0 fs/pipe.c:632\\n vfs_ioctl fs/ioctl.c:51 [inline]\\n __do_sys_ioctl fs/ioctl.c:874 [inline]\\n __se_sys_ioctl fs/ioctl.c:860 [inline]\\n __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\"},{\"lang\":\"es\",\"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\"}],\"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\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8\",\"versionEndExcluding\":\"5.10.110\",\"matchCriteriaId\":\"552AD555-63DB-4D57-BBAA-86EA26658508\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.33\",\"matchCriteriaId\":\"27C42AE8-B387-43E2-938A-E1C8B40BE6D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.19\",\"matchCriteriaId\":\"20C43679-0439-405A-B97F-685BEE50613B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"5.17.2\",\"matchCriteriaId\":\"210C679C-CF84-44A3-8939-E629C87E54BF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/112a2f9b0a8457794095a0450598f150724ec456\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5ae75b4ed30322b42abaa75ef1b784addfdb7dc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/695c47cea02b9101e2fc2e7d36d552128592b347\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a635415a064e77bcfbf43da413fd9dfe0bbed9cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b6f5ad3e45d19f9c4ee3e8a2aff829f28d68591d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • 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.
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  • 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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