CVE-2026-64449 (GCVE-0-2026-64449)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
EPSS
VEX
Title
staging: vme_user: bound slave read/write to the kern_buf size
Summary
In the Linux kernel, the following vulnerability has been resolved:
staging: vme_user: bound slave read/write to the kern_buf size
The SLAVE-path helpers buffer_to_user() and buffer_from_user() copy
'count' bytes into/out of the fixed-size kern_buf (size_buf ==
PCI_BUF_SIZE == 0x20000, 128 KiB) using *ppos as the offset, without
bounding *ppos + count against size_buf.
vme_user_write()/vme_user_read() only clamp count to the VME window size
(image_size = vme_get_size(resource)), which VME_SET_SLAVE sets from the
user-supplied slave.size -- validated against the VME address space (up
to VME_A32_MAX = 4 GiB), not against PCI_BUF_SIZE. When the window
exceeds 128 KiB, a write()/read() copies past the kern_buf allocation.
Clamp count against size_buf in both helpers, with an early return when
*ppos is already at/after the buffer end. *ppos is >= 0 here (the caller
rejects negative offsets), so size_buf - *ppos cannot wrap. This mirrors
the existing clamp in the MASTER-path helpers resource_to_user() /
resource_from_user(), and matches the read()/write() convention of a
short transfer at end-of-buffer.
Found by static analysis (CodeQL taint tracking + CBMC bounded model
checking) and confirmed dynamically under KASAN with the vme_fake bridge:
BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x2d/0x80
Write of size 262144 at addr ffff888004100000 by task trigger/68
_copy_from_user+0x2d/0x80
vme_user_write+0x13e/0x240 [vme_user]
vfs_write+0x1b8/0x7a0
ksys_write+0xb8/0x150
Severity
No CVSS data available.
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
f00a86d98a1ec3e99d352cda926fab767ba43b1f , < 65358d89dc9f1c25d9364b2b3ef0f3b47717f9ed
(git)
Affected: f00a86d98a1ec3e99d352cda926fab767ba43b1f , < adc8b9c30d716c362646edb45662aa1c641a154a (git) Affected: f00a86d98a1ec3e99d352cda926fab767ba43b1f , < 8eff7cd4817e14dbe3b9952cce55ef52d1d38940 (git) Affected: f00a86d98a1ec3e99d352cda926fab767ba43b1f , < e99f2df433c63c86c93de1e5f08f16e404388756 (git) Affected: f00a86d98a1ec3e99d352cda926fab767ba43b1f , < 1b495fa0d4927c88d88bf346bf311f2e26e860ed (git) Affected: f00a86d98a1ec3e99d352cda926fab767ba43b1f , < 9f32f38265014fac7f5dc9490fb01a638ce6e121 (git) |
|
| Linux | Linux |
Affected:
2.6.32
Unaffected: 0 , < 2.6.32 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/staging/vme_user/vme_user.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
},
{
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"status": "affected",
"version": "f00a86d98a1ec3e99d352cda926fab767ba43b1f",
"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
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{
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"versionType": "git"
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{
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"product": "Linux",
"programFiles": [
"drivers/staging/vme_user/vme_user.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.32"
},
{
"lessThan": "2.6.32",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "2.6.32",
"vulnerable": true
},
{
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},
{
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"versionEndExcluding": "7.1.4",
"versionStartIncluding": "2.6.32",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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"negate": false,
"operator": "OR"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: vme_user: bound slave read/write to the kern_buf size\n\nThe SLAVE-path helpers buffer_to_user() and buffer_from_user() copy\n\u0027count\u0027 bytes into/out of the fixed-size kern_buf (size_buf ==\nPCI_BUF_SIZE == 0x20000, 128 KiB) using *ppos as the offset, without\nbounding *ppos + count against size_buf.\n\nvme_user_write()/vme_user_read() only clamp count to the VME window size\n(image_size = vme_get_size(resource)), which VME_SET_SLAVE sets from the\nuser-supplied slave.size -- validated against the VME address space (up\nto VME_A32_MAX = 4 GiB), not against PCI_BUF_SIZE. When the window\nexceeds 128 KiB, a write()/read() copies past the kern_buf allocation.\n\nClamp count against size_buf in both helpers, with an early return when\n*ppos is already at/after the buffer end. *ppos is \u003e= 0 here (the caller\nrejects negative offsets), so size_buf - *ppos cannot wrap. This mirrors\nthe existing clamp in the MASTER-path helpers resource_to_user() /\nresource_from_user(), and matches the read()/write() convention of a\nshort transfer at end-of-buffer.\n\nFound by static analysis (CodeQL taint tracking + CBMC bounded model\nchecking) and confirmed dynamically under KASAN with the vme_fake bridge:\n\n BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x2d/0x80\n Write of size 262144 at addr ffff888004100000 by task trigger/68\n _copy_from_user+0x2d/0x80\n vme_user_write+0x13e/0x240 [vme_user]\n vfs_write+0x1b8/0x7a0\n ksys_write+0xb8/0x150"
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T08:51:19.537Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/65358d89dc9f1c25d9364b2b3ef0f3b47717f9ed"
},
{
"url": "https://git.kernel.org/stable/c/adc8b9c30d716c362646edb45662aa1c641a154a"
},
{
"url": "https://git.kernel.org/stable/c/8eff7cd4817e14dbe3b9952cce55ef52d1d38940"
},
{
"url": "https://git.kernel.org/stable/c/e99f2df433c63c86c93de1e5f08f16e404388756"
},
{
"url": "https://git.kernel.org/stable/c/1b495fa0d4927c88d88bf346bf311f2e26e860ed"
},
{
"url": "https://git.kernel.org/stable/c/9f32f38265014fac7f5dc9490fb01a638ce6e121"
}
],
"title": "staging: vme_user: bound slave read/write to the kern_buf size",
"x_generator": {
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}
}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64449",
"datePublished": "2026-07-25T08:51:19.537Z",
"dateReserved": "2026-07-19T15:36:31.788Z",
"dateUpdated": "2026-07-25T08:51:19.537Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64449",
"date": "2026-07-26",
"epss": "0.0018",
"percentile": "0.0788"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64449\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:29.727\",\"lastModified\":\"2026-07-25T10:17:29.727\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nstaging: vme_user: bound slave read/write to the kern_buf size\\n\\nThe SLAVE-path helpers buffer_to_user() and buffer_from_user() copy\\n\u0027count\u0027 bytes into/out of the fixed-size kern_buf (size_buf ==\\nPCI_BUF_SIZE == 0x20000, 128 KiB) using *ppos as the offset, without\\nbounding *ppos + count against size_buf.\\n\\nvme_user_write()/vme_user_read() only clamp count to the VME window size\\n(image_size = vme_get_size(resource)), which VME_SET_SLAVE sets from the\\nuser-supplied slave.size -- validated against the VME address space (up\\nto VME_A32_MAX = 4 GiB), not against PCI_BUF_SIZE. When the window\\nexceeds 128 KiB, a write()/read() copies past the kern_buf allocation.\\n\\nClamp count against size_buf in both helpers, with an early return when\\n*ppos is already at/after the buffer end. *ppos is \u003e= 0 here (the caller\\nrejects negative offsets), so size_buf - *ppos cannot wrap. This mirrors\\nthe existing clamp in the MASTER-path helpers resource_to_user() /\\nresource_from_user(), and matches the read()/write() convention of a\\nshort transfer at end-of-buffer.\\n\\nFound by static analysis (CodeQL taint tracking + CBMC bounded model\\nchecking) and confirmed dynamically under KASAN with the vme_fake bridge:\\n\\n BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x2d/0x80\\n Write of size 262144 at addr ffff888004100000 by task trigger/68\\n _copy_from_user+0x2d/0x80\\n vme_user_write+0x13e/0x240 [vme_user]\\n vfs_write+0x1b8/0x7a0\\n ksys_write+0xb8/0x150\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/staging/vme_user/vme_user.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"65358d89dc9f1c25d9364b2b3ef0f3b47717f9ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"adc8b9c30d716c362646edb45662aa1c641a154a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"8eff7cd4817e14dbe3b9952cce55ef52d1d38940\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"e99f2df433c63c86c93de1e5f08f16e404388756\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"1b495fa0d4927c88d88bf346bf311f2e26e860ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f00a86d98a1ec3e99d352cda926fab767ba43b1f\",\"lessThan\":\"9f32f38265014fac7f5dc9490fb01a638ce6e121\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/staging/vme_user/vme_user.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.32\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.32\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b495fa0d4927c88d88bf346bf311f2e26e860ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65358d89dc9f1c25d9364b2b3ef0f3b47717f9ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8eff7cd4817e14dbe3b9952cce55ef52d1d38940\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f32f38265014fac7f5dc9490fb01a638ce6e121\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/adc8b9c30d716c362646edb45662aa1c641a154a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e99f2df433c63c86c93de1e5f08f16e404388756\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T15:59:08Z",
"cve": "CVE-2026-64449",
"id": "CVE-2026-64449",
"initial_release_date": "2026-07-25T15:59:08Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64449",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64449.json",
"version": "2"
}
}
}
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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.
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