267 lines
14 KiB
JSON
267 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-49560",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-02-26T02:08:31.591Z",
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"datePublished": "2025-02-26T02:14:05.548Z",
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"dateUpdated": "2026-08-05T08:55:44.020Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:55:44.020Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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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→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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/exfat/balloc.c",
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"fs/exfat/exfat_fs.h",
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"fs/exfat/fatent.c"
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],
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"versions": [
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{
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"version": "1e49a94cf707204b66a3fb242f2814712c941f52",
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"lessThan": "82f723b8a5adf497f9e34c702a30ca7298615654",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1e49a94cf707204b66a3fb242f2814712c941f52",
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"lessThan": "c504167adc3248095a905fa0700a9693897cb5ed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1e49a94cf707204b66a3fb242f2814712c941f52",
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"lessThan": "7c58b14b6f9cde9f69e7fa053ab73f6e013a7131",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1e49a94cf707204b66a3fb242f2814712c941f52",
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"lessThan": "2193286402df2d9c53294f7a858d5e6fd7346e08",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1e49a94cf707204b66a3fb242f2814712c941f52",
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"lessThan": "64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/exfat/balloc.c",
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"fs/exfat/exfat_fs.h",
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"fs/exfat/fatent.c"
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],
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"versions": [
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{
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"version": "5.7",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.7",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.120",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.45",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.17.13",
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"lessThanOrEqual": "5.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.18.2",
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"lessThanOrEqual": "5.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.19",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.10.120"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.15.45"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.17.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.18.2"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.19"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/82f723b8a5adf497f9e34c702a30ca7298615654"
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},
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{
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"url": "https://git.kernel.org/stable/c/c504167adc3248095a905fa0700a9693897cb5ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/7c58b14b6f9cde9f69e7fa053ab73f6e013a7131"
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},
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{
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"url": "https://git.kernel.org/stable/c/2193286402df2d9c53294f7a858d5e6fd7346e08"
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},
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{
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"url": "https://git.kernel.org/stable/c/64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d"
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}
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],
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"title": "exfat: check if cluster num is valid",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.1,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2022-49560",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:37:16.623841Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-10-01T19:46:39.057Z"
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}
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}
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]
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}
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} |