207 lines
10 KiB
JSON
207 lines
10 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2024-40955",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-07-12T12:17:45.592Z",
|
|
"datePublished": "2024-07-12T12:31:58.328Z",
|
|
"dateUpdated": "2026-05-11T20:23:04.131Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-05-11T20:23:04.131Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()\n\nWe can trigger a slab-out-of-bounds with the following commands:\n\n mkfs.ext4 -F /dev/$disk 10G\n mount /dev/$disk /tmp/test\n echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc\n echo test > /tmp/test/file && sync\n\n==================================================================\nBUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]\nRead of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11\nCPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521\nCall Trace:\n dump_stack_lvl+0x2c/0x50\n kasan_report+0xb6/0xf0\n ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]\n ext4_mb_regular_allocator+0x19e9/0x2370 [ext4]\n ext4_mb_new_blocks+0x88a/0x1370 [ext4]\n ext4_ext_map_blocks+0x14f7/0x2390 [ext4]\n ext4_map_blocks+0x569/0xea0 [ext4]\n ext4_do_writepages+0x10f6/0x1bc0 [ext4]\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\n// Set s_mb_group_prealloc to 2147483647 via sysfs\next4_mb_new_blocks\n ext4_mb_normalize_request\n ext4_mb_normalize_group_request\n ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc\n ext4_mb_regular_allocator\n ext4_mb_choose_next_group\n ext4_mb_choose_next_group_best_avail\n mb_avg_fragment_size_order\n order = fls(len) - 2 = 29\n ext4_mb_find_good_group_avg_frag_lists\n frag_list = &sbi->s_mb_avg_fragment_size[order]\n if (list_empty(frag_list)) // Trigger SOOB!\n\nAt 4k block size, the length of the s_mb_avg_fragment_size list is 14,\nbut an oversized s_mb_group_prealloc is set, causing slab-out-of-bounds\nto be triggered by an attempt to access an element at index 29.\n\nAdd a new attr_id attr_clusters_in_group with values in the range\n[0, sbi->s_clusters_per_group] and declare mb_group_prealloc as\nthat type to fix the issue. In addition avoid returning an order\nfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)\nand reduce some useless loops."
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/ext4/mballoc.c",
|
|
"fs/ext4/sysfs.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "7e170922f06bf46effa7c57f6035fc463d6edc7e",
|
|
"lessThan": "677ff4589f1501578fa903a25bb14831d0607992",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "7e170922f06bf46effa7c57f6035fc463d6edc7e",
|
|
"lessThan": "b829687ae1229224262bcabf49accfa2dbf8db06",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "7e170922f06bf46effa7c57f6035fc463d6edc7e",
|
|
"lessThan": "13df4d44a3aaabe61cd01d277b6ee23ead2a5206",
|
|
"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/ext4/mballoc.c",
|
|
"fs/ext4/sysfs.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.5",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.5",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.36",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.9.7",
|
|
"lessThanOrEqual": "6.9.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.10",
|
|
"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": "6.5",
|
|
"versionEndExcluding": "6.6.36"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.5",
|
|
"versionEndExcluding": "6.9.7"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.5",
|
|
"versionEndExcluding": "6.10"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206"
|
|
}
|
|
],
|
|
"title": "ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-08-02T04:39:55.960Z"
|
|
},
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2024-40955",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2024-09-10T17:03:45.786138Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-09-11T17:34:24.264Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |