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CVE-2022-49395 (GCVE-0-2022-49395)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:11 – Updated: 2026-05-11 18:58
VLAI
Title
um: Fix out-of-bounds read in LDT setup
Summary
In the Linux kernel, the following vulnerability has been resolved: um: Fix out-of-bounds read in LDT setup syscall_stub_data() expects the data_count parameter to be the number of longs, not bytes. ================================================================== BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0 Read of size 128 at addr 000000006411f6f0 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18 Call Trace: show_stack.cold+0x166/0x2a7 __dump_stack+0x3a/0x43 dump_stack_lvl+0x1f/0x27 print_report.cold+0xdb/0xf81 kasan_report+0x119/0x1f0 kasan_check_range+0x3a3/0x440 memcpy+0x52/0x140 syscall_stub_data+0x70/0xe0 write_ldt_entry+0xac/0x190 init_new_ldt+0x515/0x960 init_new_context+0x2c4/0x4d0 mm_init.constprop.0+0x5ed/0x760 mm_alloc+0x118/0x170 0x60033f48 do_one_initcall+0x1d7/0x860 0x60003e7b kernel_init+0x6e/0x3d4 new_thread_handler+0x1e7/0x2c0 The buggy address belongs to stack of task swapper/1 and is located at offset 64 in frame: init_new_ldt+0x0/0x960 This frame has 2 objects: [32, 40) 'addr' [64, 80) 'desc' ==================================================================
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:41 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 668ca34a428d6ffc0f99a1a6a9b661a288d4183b (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < ef1dc929a1e5fa1b2d842256db9fb8710d3be910 (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 3549ab4b962cf619e8c55484a0d870a34b3f845f (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 9caad70819aef3431abaf73ba5163b55b161aba0 (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < cf0dabc37446c5ee538ae7b4c467ab0e53fa5463 (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 10995a382271254bd276627ec74136da4a23c4a6 (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 24ca648bf5f72ed8878cf09b5d4431935779681e (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 91e5ba2af2d729d5126aefd5aa3eadc69b8426e5 (git)
Affected: 858259cf7d1c443c836a2022b78cb281f0a9b95e , < 2a4a62a14be1947fa945c5c11ebf67326381a568 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.15
Unaffected: 0 , < 2.6.15 (semver)
Unaffected: 4.9.318 , ≤ 4.9.* (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.121 , ≤ 5.10.* (semver)
Unaffected: 5.15.46 , ≤ 5.15.* (semver)
Unaffected: 5.17.14 , ≤ 5.17.* (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "datePublished": "2025-02-26T02:11:25.676Z",
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      "date": "2026-09-15",
      "epss": "0.00285",
      "percentile": "0.20989"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49395\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:16.080\",\"lastModified\":\"2026-06-17T05:17:55.690\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\num: Fix out-of-bounds read in LDT setup\\n\\nsyscall_stub_data() expects the data_count parameter to be the number of\\nlongs, not bytes.\\n\\n ==================================================================\\n BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0\\n Read of size 128 at addr 000000006411f6f0 by task swapper/1\\n\\n CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18\\n Call Trace:\\n  show_stack.cold+0x166/0x2a7\\n  __dump_stack+0x3a/0x43\\n  dump_stack_lvl+0x1f/0x27\\n  print_report.cold+0xdb/0xf81\\n  kasan_report+0x119/0x1f0\\n  kasan_check_range+0x3a3/0x440\\n  memcpy+0x52/0x140\\n  syscall_stub_data+0x70/0xe0\\n  write_ldt_entry+0xac/0x190\\n  init_new_ldt+0x515/0x960\\n  init_new_context+0x2c4/0x4d0\\n  mm_init.constprop.0+0x5ed/0x760\\n  mm_alloc+0x118/0x170\\n  0x60033f48\\n  do_one_initcall+0x1d7/0x860\\n  0x60003e7b\\n  kernel_init+0x6e/0x3d4\\n  new_thread_handler+0x1e7/0x2c0\\n\\n The buggy address belongs to stack of task swapper/1\\n  and is located at offset 64 in frame:\\n  init_new_ldt+0x0/0x960\\n\\n This frame has 2 objects:\\n  [32, 40) \u0027addr\u0027\\n  [64, 80) \u0027desc\u0027\\n ==================================================================\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: um: Se corrige la lectura fuera de los l\u00edmites en la configuraci\u00f3n de LDT syscall_stub_data() espera que el par\u00e1metro data_count sea el n\u00famero de longs, no bytes. ===================================================================== ERROR: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0 Read of size 128 at addr 000000006411f6f0 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18 Call Trace: show_stack.cold+0x166/0x2a7 __dump_stack+0x3a/0x43 dump_stack_lvl+0x1f/0x27 print_report.cold+0xdb/0xf81 kasan_report+0x119/0x1f0 kasan_check_range+0x3a3/0x440 memcpy+0x52/0x140 syscall_stub_data+0x70/0xe0 write_ldt_entry+0xac/0x190 init_new_ldt+0x515/0x960 init_new_context+0x2c4/0x4d0 mm_init.constprop.0+0x5ed/0x760 mm_alloc+0x118/0x170 0x60033f48 do_one_initcall+0x1d7/0x860 0x60003e7b kernel_init+0x6e/0x3d4 new_thread_handler+0x1e7/0x2c0 The buggy address belongs to stack of task swapper/1 and is located at offset 64 in frame: init_new_ldt+0x0/0x960 This frame has 2 objects: [32, 40) \u0027addr\u0027 [64, 80) \u0027desc\u0027 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:06:08+00:00",
      "cve": "CVE-2022-49395",
      "id": "CVE-2022-49395",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "1087",
      "product_status:known_affected": "136",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: um: Fix out-of-bounds read in LDT setup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49395.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:27:42Z",
      "cve": "CVE-2022-49395",
      "id": "CVE-2022-49395",
      "initial_release_date": "2025-02-27T03:07:34Z",
      "product_status:known_affected": "664",
      "product_status:known_not_affected": "144",
      "product_status:recommended": "60",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49395",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49395.json",
      "version": "41"
    },
    "vulnrichment": {
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dump_stack_lvl+0x1f/0x27\\n  print_report.cold+0xdb/0xf81\\n  kasan_report+0x119/0x1f0\\n  kasan_check_range+0x3a3/0x440\\n  memcpy+0x52/0x140\\n  syscall_stub_data+0x70/0xe0\\n  write_ldt_entry+0xac/0x190\\n  init_new_ldt+0x515/0x960\\n  init_new_context+0x2c4/0x4d0\\n  mm_init.constprop.0+0x5ed/0x760\\n  mm_alloc+0x118/0x170\\n  0x60033f48\\n  do_one_initcall+0x1d7/0x860\\n  0x60003e7b\\n  kernel_init+0x6e/0x3d4\\n  new_thread_handler+0x1e7/0x2c0\\n\\n The buggy address belongs to stack of task swapper/1\\n  and is located at offset 64 in frame:\\n  init_new_ldt+0x0/0x960\\n\\n This frame has 2 objects:\\n  [32, 40) \u0027addr\u0027\\n  [64, 80) \u0027desc\u0027\\n ==================================================================\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.318\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": 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      "cveMetadata": "{\"cveId\": \"CVE-2022-49395\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T18:58:55.326Z\", \"dateReserved\": \"2025-02-26T02:08:31.562Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:11:25.676Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.