CVE-2025-38415 (GCVE-0-2025-38415)
Vulnerability from cvelistv5 – Published: 2025-07-25 13:32 – Updated: 2026-06-18 20:55
VLAI
EPSS
VEX
Title
Squashfs: check return result of sb_min_blocksize
Summary
In the Linux kernel, the following vulnerability has been resolved:
Squashfs: check return result of sb_min_blocksize
Syzkaller reports an "UBSAN: shift-out-of-bounds in squashfs_bio_read" bug.
Syzkaller forks multiple processes which after mounting the Squashfs
filesystem, issues an ioctl("/dev/loop0", LOOP_SET_BLOCK_SIZE, 0x8000).
Now if this ioctl occurs at the same time another process is in the
process of mounting a Squashfs filesystem on /dev/loop0, the failure
occurs. When this happens the following code in squashfs_fill_super()
fails.
----
msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
msblk->devblksize_log2 = ffz(~msblk->devblksize);
----
sb_min_blocksize() returns 0, which means msblk->devblksize is set to 0.
As a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2
is set to 64.
This subsequently causes the
UBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36
shift exponent 64 is too large for 64-bit type 'u64' (aka
'unsigned long long')
This commit adds a check for a 0 return by sb_min_blocksize().
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 20:55 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0aa666190509ffab81c202c5095a166be23961ac , < db7096ea160e40d78c67fce52e7cc51bde049497
(git)
Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 549f9e3d7b60d53808c98b9fde49b4f46d0524a5 (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 5c51aa862cbeed2f3887f0382a2708956710bd68 (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 6abf6b78c6fb112eee495f5636ffcc350dd2ce25 (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 4f99357dadbf9c979ad737156ad4c37fadf7c56b (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 0aff95d9bc7fb5400ca8af507429c4b067bdb425 (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282 (git) Affected: 0aa666190509ffab81c202c5095a166be23961ac , < 734aa85390ea693bb7eaf2240623d41b03705c84 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.29
Unaffected: 0 , < 2.6.29 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.94 , ≤ 6.6.* (semver) Unaffected: 6.12.34 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Squashfs: comprobar el resultado devuelto de sb_min_blocksize. Syzkaller informa del error \"UBSAN: desplazamiento fuera de los l\u00edmites en squashfs_bio_read\". Syzkaller bifurca varios procesos que, tras montar el sistema de archivos Squashfs, emiten una instrucci\u00f3n ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). Si esta instrucci\u00f3n ioctl se produce al mismo tiempo que otro proceso est\u00e1 montando un sistema de archivos Squashfs en /dev/loop0, se produce el fallo. En este caso, el siguiente c\u00f3digo en squashfs_fill_super() falla: ---- msblk-\u0026gt;devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk-\u0026gt;devblksize_log2 = ffz(~msblk-\u0026gt;devblksize); ---- sb_min_blocksize() devuelve 0, lo que significa que msblk-\u0026gt;devblksize est\u00e1 establecido en 0. Como resultado, ffz(~msblk-\u0026gt;devblksize) devuelve 64 y msblk-\u0026gt;devblksize_log2 est\u00e1 establecido en 64. Esto posteriormente provoca el UBSAN: shift-out-of-bounds en fs/squashfs/block.c:195:36 el exponente de desplazamiento 64 es demasiado grande para el tipo de 64 bits \u0027u64\u0027 (tambi\u00e9n conocido como \u0027unsigned long long\u0027) Esta confirmaci\u00f3n agrega una comprobaci\u00f3n para un retorno de 0 por sb_min_blocksize()."
}
],
"id": "CVE-2025-38415",
"lastModified": "2026-06-18T21:16:28.157",
"metrics": {
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{
"cvssData": {
"attackComplexity": "LOW",
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"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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{
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"tags": [
"Patch"
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},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:07:55+00:00",
"cve": "CVE-2025-38415",
"id": "CVE-2025-38415",
"initial_release_date": "2025-07-25T00:00:00+00:00",
"product_status:fixed": "2416",
"product_status:known_affected": "36",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38415.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-11-03T17:37:45.927Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-38415",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-18T20:55:21.631432Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-11T17:39:14.218Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/squashfs/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "0aa666190509ffab81c202c5095a166be23961ac",
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},
{
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"status": "affected",
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{
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{
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"status": "affected",
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"status": "affected",
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "2.6.29"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.4.295",
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},
{
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"status": "unaffected",
"version": "5.10.239",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.186",
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},
{
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},
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},
{
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},
{
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"version": "6.15.3",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs. When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk-\u003edevblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk-\u003edevblksize_log2 = ffz(~msblk-\u003edevblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk-\u003edevblksize is set to 0.\n\nAs a result, ffz(~msblk-\u003edevblksize) returns 64, and msblk-\u003edevblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type \u0027u64\u0027 (aka\n\u0027unsigned long long\u0027)\n\nThis commit adds a check for a 0 return by sb_min_blocksize()."
}
],
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},
{
"url": "https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84"
}
],
"title": "Squashfs: check return result of sb_min_blocksize",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-38415",
"datePublished": "2025-07-25T13:32:09.711Z",
"dateReserved": "2025-04-16T04:51:24.013Z",
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"state": "PUBLISHED"
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}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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