{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49560", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.591Z", "datePublished": "2025-02-26T02:14:05.548Z", "dateUpdated": "2026-08-05T08:55:44.020Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:44.020Z" }, "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()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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→exfat_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->num_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—supplying 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/exfat/balloc.c", "fs/exfat/exfat_fs.h", "fs/exfat/fatent.c" ], "versions": [ { "version": "1e49a94cf707204b66a3fb242f2814712c941f52", "lessThan": "82f723b8a5adf497f9e34c702a30ca7298615654", "status": "affected", "versionType": "git" }, { "version": "1e49a94cf707204b66a3fb242f2814712c941f52", "lessThan": "c504167adc3248095a905fa0700a9693897cb5ed", "status": "affected", "versionType": "git" }, { "version": "1e49a94cf707204b66a3fb242f2814712c941f52", "lessThan": "7c58b14b6f9cde9f69e7fa053ab73f6e013a7131", "status": "affected", "versionType": "git" }, { "version": "1e49a94cf707204b66a3fb242f2814712c941f52", "lessThan": "2193286402df2d9c53294f7a858d5e6fd7346e08", "status": "affected", "versionType": "git" }, { "version": "1e49a94cf707204b66a3fb242f2814712c941f52", "lessThan": "64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/exfat/balloc.c", "fs/exfat/exfat_fs.h", "fs/exfat/fatent.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.120", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.45", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.13", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.2", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.17.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.18.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.19" } ] } ] } ], "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" } ], "title": "exfat: check if cluster num is valid", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "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" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:46:39.057Z" } } ] } }