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CVE-2022-49560 (GCVE-0-2022-49560)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:14 – Updated: 2026-08-05 08:55
VLAI
Title
exfat: check if cluster num is valid
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: check if cluster num is valid Syzbot reported slab-out-of-bounds read in exfat_clear_bitmap. This was triggered by reproducer calling truncute with size 0, which causes the following trace: BUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181 __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217 exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243 exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339 notify_change+0xb76/0xe10 fs/attr.c:336 do_truncate+0x1ea/0x2d0 fs/open.c:65 Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 19:37 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1e49a94cf707204b66a3fb242f2814712c941f52 , < 82f723b8a5adf497f9e34c702a30ca7298615654 (git)
Affected: 1e49a94cf707204b66a3fb242f2814712c941f52 , < c504167adc3248095a905fa0700a9693897cb5ed (git)
Affected: 1e49a94cf707204b66a3fb242f2814712c941f52 , < 7c58b14b6f9cde9f69e7fa053ab73f6e013a7131 (git)
Affected: 1e49a94cf707204b66a3fb242f2814712c941f52 , < 2193286402df2d9c53294f7a858d5e6fd7346e08 (git)
Affected: 1e49a94cf707204b66a3fb242f2814712c941f52 , < 64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.120 , ≤ 5.10.* (semver)
Unaffected: 5.15.45 , ≤ 5.15.* (semver)
Unaffected: 5.17.13 , ≤ 5.17.* (semver)
Unaffected: 5.18.2 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The bug is reached by mounting a crafted exFAT image (loop/USB/SD) and then truncating or unlinking a file whose stream entry describes an invalid cluster extent, flowing through setattr/evict into exfat_free_cluster\u2192exfat_clear_bitmap. This is a local block-device filesystem path, not a network protocol handler.\nAC:L - The attacker fully controls on-disk start_clu, ALLOC_NO_FAT_CHAIN flags, and file size, so truncate-to-zero or unlink deterministically walks cluster numbers past sbi-\u003enum_clusters into exfat_clear_bitmap with no race or other condition outside their control.\nPR:N - exFAT lacks FS_USERNS_MOUNT; the attacker needs no account on the victim host\u2014supplying a malicious exFAT volume (USB stick, SD card, disk image) is enough, and CAP_SYS_ADMIN belongs to the victim/automount path that mounts it.\nUI:R - Exploitation requires a user or automount/storage path to mount the attacker-supplied exFAT volume and then truncate or delete a crafted file so __exfat_truncate frees the invalid cluster chain.\nS:U - The slab OOB access and subsequent bit-clear write occur in host kernel memory within the same security authority as the mounting kernel; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN reports a slab-out-of-bounds read of the vol_amap[i] pointer when the cluster index exceeds map_sectors, disclosing adjacent heap contents; per guidance unbounded/OOB reads of kernel memory are High confidentiality impact.\nI:H - After the OOB pointer load, clear_bit_le (and the analogous set_bit_le in exfat_set_bitmap) writes through that pointer, yielding an out-of-bounds/arbitrary bit-clear write primitive classed as High integrity impact.\nA:H - The demonstrated KASAN slab-out-of-bounds fault in exfat_clear_bitmap during truncate can oops/panic the kernel, fully denying availability."
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And add is_valid_cluster()\\nto validate if cluster number is within valid range in exfat_clear_bitmap()\\nand exfat_set_bitmap().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: exfat: comprobar si el n\u00famero de cl\u00faster es v\u00e1lido Syzbot inform\u00f3 una lectura de slab fuera de los l\u00edmites en exfat_clear_bitmap. Esto fue provocado por el reproductor que llama a truncute con tama\u00f1o 0, lo que provoca el siguiente seguimiento: ERROR: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181 __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217 exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243 exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339 notify_change+0xb76/0xe10 fs/attr.c:336 do_truncate+0x1ea/0x2d0 fs/open.c:65 Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap(). 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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7\",\"versionEndExcluding\":\"5.10.120\",\"matchCriteriaId\":\"78702CD4-AEE5-45F6-90C7-1EB25AF09D08\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.45\",\"matchCriteriaId\":\"08D699AD-F4CE-4BDD-A97E-4997299C7712\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.17.13\",\"matchCriteriaId\":\"192FC54B-5367-49D6-B410-0285F14665B1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18\",\"versionEndExcluding\":\"5.18.2\",\"matchCriteriaId\":\"9FF255A1-64F4-4E31-AF44-C92FB8773BA2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2193286402df2d9c53294f7a858d5e6fd7346e08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7c58b14b6f9cde9f69e7fa053ab73f6e013a7131\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/82f723b8a5adf497f9e34c702a30ca7298615654\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c504167adc3248095a905fa0700a9693897cb5ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:11:37+00:00",
      "cve": "CVE-2022-49560",
      "id": "CVE-2022-49560",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: exfat: Out-of-bounds read leads to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49560.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:30:12Z",
      "cve": "CVE-2022-49560",
      "id": "CVE-2022-49560",
      "initial_release_date": "2025-02-27T03:05:00Z",
      "product_status:known_affected": "494",
      "product_status:known_not_affected": "275",
      "product_status:recommended": "100",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49560",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49560.json",
      "version": "40"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.1, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49560\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:37:16.623841Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:50:01.269Z\"}}], \"cna\": {\"title\": \"exfat: check if cluster num is valid\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1e49a94cf707204b66a3fb242f2814712c941f52\", \"lessThan\": \"82f723b8a5adf497f9e34c702a30ca7298615654\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e49a94cf707204b66a3fb242f2814712c941f52\", \"lessThan\": \"c504167adc3248095a905fa0700a9693897cb5ed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e49a94cf707204b66a3fb242f2814712c941f52\", \"lessThan\": \"7c58b14b6f9cde9f69e7fa053ab73f6e013a7131\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e49a94cf707204b66a3fb242f2814712c941f52\", \"lessThan\": 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\"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.18.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/exfat/balloc.c\", \"fs/exfat/exfat_fs.h\", \"fs/exfat/fatent.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/82f723b8a5adf497f9e34c702a30ca7298615654\"}, {\"url\": \"https://git.kernel.org/stable/c/c504167adc3248095a905fa0700a9693897cb5ed\"}, {\"url\": \"https://git.kernel.org/stable/c/7c58b14b6f9cde9f69e7fa053ab73f6e013a7131\"}, {\"url\": \"https://git.kernel.org/stable/c/2193286402df2d9c53294f7a858d5e6fd7346e08\"}, {\"url\": \"https://git.kernel.org/stable/c/64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nexfat: check if cluster num is valid\\n\\nSyzbot reported slab-out-of-bounds read in exfat_clear_bitmap.\\nThis was triggered by reproducer calling truncute with size 0,\\nwhich causes the following trace:\\n\\nBUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174\\nRead of size 8 at addr ffff888115aa9508 by task syz-executor251/365\\n\\nCall Trace:\\n __dump_stack lib/dump_stack.c:77 [inline]\\n dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118\\n print_address_description+0x81/0x3c0 mm/kasan/report.c:233\\n __kasan_report mm/kasan/report.c:419 [inline]\\n kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436\\n __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309\\n exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174\\n exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181\\n __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217\\n exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243\\n exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339\\n notify_change+0xb76/0xe10 fs/attr.c:336\\n do_truncate+0x1ea/0x2d0 fs/open.c:65\\n\\nMove the is_valid_cluster() helper from fatent.c to a common\\nheader to make it reusable in other *.c files. And add is_valid_cluster()\\nto validate if cluster number is within valid range in exfat_clear_bitmap()\\nand exfat_set_bitmap().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.120\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.45\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.13\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.2\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:02:18.642Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49560\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:02:18.642Z\", \"dateReserved\": \"2025-02-26T02:08:31.591Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:14:05.548Z\", \"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.


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.