CVE-2026-80547 (GCVE-0-2026-80547)
Vulnerability from cvelistv5
Published
2026-08-26 14:37
Modified
2026-08-27 12:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
s390/vfio_ccw: Implement a crw lock
Unlike the channel_program struct, which covers synchronous I/O
submissions and asynchronous interrupts, the CRW region relies
exclusively on asynchronous events coming from hardware.
Implement a lock to manage the list of those payloads, to ensure
they are read cohesively.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee Version: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/s390/cio/vfio_ccw_chp.c",
"drivers/s390/cio/vfio_ccw_drv.c",
"drivers/s390/cio/vfio_ccw_ops.c",
"drivers/s390/cio/vfio_ccw_private.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3c94d4179bcc19e01b28db634c07a58b28116209",
"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
"lessThan": "0edd222730a9d7ec98368aaf1d40ee2d8d862e61",
"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
"lessThan": "a3d60ae24183eee352c8e87a0ff94c97cd87f156",
"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
"lessThan": "49fa26b0df009dc1f420980bd71780e70615b83b",
"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
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"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
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"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
},
{
"lessThan": "16b0798024c0e9117e395829ddbbe70981c79d9c",
"status": "affected",
"version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/s390/cio/vfio_ccw_chp.c",
"drivers/s390/cio/vfio_ccw_drv.c",
"drivers/s390/cio/vfio_ccw_ops.c",
"drivers/s390/cio/vfio_ccw_private.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"lessThan": "5.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.218",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.185",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.154",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.105",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.46",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.10",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Implement a crw lock\n\nUnlike the channel_program struct, which covers synchronous I/O\nsubmissions and asynchronous interrupts, the CRW region relies\nexclusively on asynchronous events coming from hardware.\n\nImplement a lock to manage the list of those payloads, to ensure\nthey are read cohesively."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached only via local VFIO mediated-device access (read/ioctl on /dev/vfio/* device fds) to the CCW CRW region; vfio-ccw has no network, Bluetooth, or physical-bus packet entry point.\nAC:L - The attacker controls CRW region reads and can retry concurrently while channel-path events queue CRWs via vfio_ccw_chp_event(); this user-versus-hardware/workqueue list race is winnable without conditions outside attacker influence.\nPR:L - Triggering requires an opened vfio-ccw mdev fd (typical QEMU/libvirt VM operator or delegated /dev/vfio holder on IBM Z passthrough hosts), not init-namespace root; admin creates the mdev but exploitation needs only that VFIO client access.\nUI:N - No separate victim action is required; once vfio-ccw passthrough is configured, the attacker repeatedly reads the CRW region while guest/channel I/O generates asynchronous path events without needing another user to interact.\nS:C - On IBM Z/LinuxONE, vfio-ccw passes DASD subchannels into KVM guests; guest-driven channel activity causes host-side CRW queuing while the VFIO client reads the CRW region, corrupting hypervisor kernel memory outside the VM security boundary.\nC:H - Unsynchronized list_del/list_add/kfree on kmalloc vfio_ccw_crw objects is a use-after-free/list-corruption primitive; per kernel guidance this enables attacker-influenced heap reuse and arbitrary kernel memory disclosure.\nI:H - Corrupted list pointers and freed CRW entries allow heap-sprayable arbitrary writes and control-flow hijack beyond a simple crash, matching kernel guidance for use-after-free and memory corruption bugs.\nA:H - Concurrent unsynchronized list manipulation can immediately oops or panic the host kernel via invalid list operations or double-free, and successful exploitation can hang or crash the entire system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T12:40:07.162Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3c94d4179bcc19e01b28db634c07a58b28116209"
},
{
"url": "https://git.kernel.org/stable/c/0edd222730a9d7ec98368aaf1d40ee2d8d862e61"
},
{
"url": "https://git.kernel.org/stable/c/a3d60ae24183eee352c8e87a0ff94c97cd87f156"
},
{
"url": "https://git.kernel.org/stable/c/49fa26b0df009dc1f420980bd71780e70615b83b"
},
{
"url": "https://git.kernel.org/stable/c/7902be374cbfc11c3435e1e87bf22195bf06a558"
},
{
"url": "https://git.kernel.org/stable/c/c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9"
},
{
"url": "https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c"
}
],
"title": "s390/vfio_ccw: Implement a crw lock",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80547",
"datePublished": "2026-08-26T14:37:18.159Z",
"dateReserved": "2026-08-26T14:34:25.766Z",
"dateUpdated": "2026-08-27T12:40:07.162Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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