CVE-2025-40322 (GCVE-0-2025-40322)
Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-08-05 12:09
VLAI
EPSS
VEX
Title
fbdev: bitblit: bound-check glyph index in bit_putcs*
Summary
In the Linux kernel, the following vulnerability has been resolved:
fbdev: bitblit: bound-check glyph index in bit_putcs*
bit_putcs_aligned()/unaligned() derived the glyph pointer from the
character value masked by 0xff/0x1ff, which may exceed the actual font's
glyph count and read past the end of the built-in font array.
Clamp the index to the actual glyph count before computing the address.
This fixes a global out-of-bounds read reported by syzbot.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:33 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a10cede006f9614b465cf25609a8753efbfd45cc
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0998a6cb232674408a03e8561dc15aa266b2f53b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db5c9a162d2f42bcc842b76b3d935dcc050a0eec (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c12003bf91fdff381c55ef54fef3e961a5af2545 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9ba1a7802ca9a2590cef95b253e6526f4364477f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 901f44227072be60812fe8083e83e1533c04eed1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < efaf89a75a29b2d179bf4fe63ca62852e93ad620 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18c4ef4e765a798b47980555ed665d78b71aeadf (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.4.302 , ≤ 5.4.* (semver) Unaffected: 5.10.247 , ≤ 5.10.* (semver) Unaffected: 5.15.197 , ≤ 5.15.* (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_putcs*\n\nbit_putcs_aligned()/unaligned() derived the glyph pointer from the\ncharacter value masked by 0xff/0x1ff, which may exceed the actual font\u0027s\nglyph count and read past the end of the built-in font array.\nClamp the index to the actual glyph count before computing the address.\n\nThis fixes a global out-of-bounds read reported by syzbot."
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"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: bitblit: verificaci\u00f3n de l\u00edmites del \u00edndice de glifo en bit_putcs\n\nbit_putcs_aligned()/unaligned() deriv\u00f3 el puntero del glifo del valor del car\u00e1cter enmascarado por 0xff/0x1ff, lo que puede exceder el recuento real de glifos de la fuente y leer m\u00e1s all\u00e1 del final del array de fuentes incorporado. Limitar el \u00edndice al recuento real de glifos antes de calcular la direcci\u00f3n.\n\nEsto corrige una lectura global fuera de l\u00edmites reportada por syzbot."
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T08:43:24+00:00",
"cve": "CVE-2025-40322",
"id": "CVE-2025-40322",
"initial_release_date": "2025-12-08T00:00:00+00:00",
"product_status:fixed": "2311",
"product_status:known_affected": "22",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40322.json",
"version": "3"
},
"vulnrichment": {
"containers": {
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{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-40322",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-16T19:33:40.857434Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-16T19:33:45.813Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/video/fbdev/core/bitblit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a10cede006f9614b465cf25609a8753efbfd45cc",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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},
{
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},
{
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{
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{
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}
]
},
{
"defaultStatus": "affected",
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"programFiles": [
"drivers/video/fbdev/core/bitblit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"lessThan": "2.6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.302",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.197",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
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},
{
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"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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},
{
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}
],
"negate": false,
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}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_putcs*\n\nbit_putcs_aligned()/unaligned() derived the glyph pointer from the\ncharacter value masked by 0xff/0x1ff, which may exceed the actual font\u0027s\nglyph count and read past the end of the built-in font array.\nClamp the index to the actual glyph count before computing the address.\n\nThis fixes a global out-of-bounds read reported by syzbot."
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
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},
{
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},
{
"url": "https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545"
},
{
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{
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},
{
"url": "https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf"
}
],
"title": "fbdev: bitblit: bound-check glyph index in bit_putcs*",
"x_generator": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2025-40322",
"datePublished": "2025-12-08T00:46:49.773Z",
"dateReserved": "2025-04-16T07:20:57.186Z",
"dateUpdated": "2026-06-16T19:34:17.887Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.