CVE-2026-89978 (GCVE-0-2026-89978)
Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
VLAI
EPSS
VEX
Title
accel/amdxdna: return early from a zero-length flush
Summary
In the Linux kernel, the following vulnerability has been resolved:
accel/amdxdna: return early from a zero-length flush
SYNC_BO does not constrain its size, so a request for zero bytes reaches
drm_clflush_virt_range(), which ends with an unconditional
clflushopt(end - 1). For an empty range that is the byte before the
mapping, and abo->mem.kva comes from vmap(), so the access lands in the
guard page below the vmalloc area and faults:
BUG: unable to handle page fault for address: ffffd16fbbc70fff
#PF: supervisor read access in kernel mode
Oops: Oops: 0000 [#1] SMP NOPTI
CPU: 7 UID: 1000 Comm: sync_bo_probe
RIP: 0010:drm_clflush_virt_range+0x3c/0x70
Call Trace:
amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]
drm_ioctl+0x301/0x4c0
__x64_sys_ioctl+0x115/0x2f0
do_syscall_64+0xa6/0x3d0
Any process that can open the render node can do this. Reproduced 3 of 3
times on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on
an AMDXDNA_BO_SHARE object. The import arm takes the same request but
flushes the whole scatterlist, so it survives it.
Nothing needs flushing for an empty range, so answer before choosing a
path.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e252e3f3488a49267e08ea7d972ac5ba3f2f1763 , < 45962da5821d0a691f638ccb13842889156d8969
(git)
Affected: e252e3f3488a49267e08ea7d972ac5ba3f2f1763 , < f00def884a831dc49eb659dac2dd09dbfd21e67f (git) Affected: e252e3f3488a49267e08ea7d972ac5ba3f2f1763 , < dc14753664240cedf669623b27ae9922b0618b25 (git) |
guessed | |
| Linux | Linux |
Affected:
6.17
Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/accel/amdxdna/amdxdna_gem.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "45962da5821d0a691f638ccb13842889156d8969",
"status": "affected",
"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763",
"versionType": "git"
},
{
"lessThan": "f00def884a831dc49eb659dac2dd09dbfd21e67f",
"status": "affected",
"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763",
"versionType": "git"
},
{
"lessThan": "dc14753664240cedf669623b27ae9922b0618b25",
"status": "affected",
"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/accel/amdxdna/amdxdna_gem.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.5",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc2",
"versionStartIncluding": "6.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: return early from a zero-length flush\n\nSYNC_BO does not constrain its size, so a request for zero bytes reaches\ndrm_clflush_virt_range(), which ends with an unconditional\nclflushopt(end - 1). For an empty range that is the byte before the\nmapping, and abo-\u003emem.kva comes from vmap(), so the access lands in the\nguard page below the vmalloc area and faults:\n\n BUG: unable to handle page fault for address: ffffd16fbbc70fff\n #PF: supervisor read access in kernel mode\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 7 UID: 1000 Comm: sync_bo_probe\n RIP: 0010:drm_clflush_virt_range+0x3c/0x70\n Call Trace:\n amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]\n drm_ioctl+0x301/0x4c0\n __x64_sys_ioctl+0x115/0x2f0\n do_syscall_64+0xa6/0x3d0\n\nAny process that can open the render node can do this. Reproduced 3 of 3\ntimes on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on\nan AMDXDNA_BO_SHARE object. The import arm takes the same request but\nflushes the whole scatterlist, so it survives it.\n\nNothing needs flushing for an empty range, so answer before choosing a\npath."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T10:32:55.928Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/45962da5821d0a691f638ccb13842889156d8969"
},
{
"url": "https://git.kernel.org/stable/c/f00def884a831dc49eb659dac2dd09dbfd21e67f"
},
{
"url": "https://git.kernel.org/stable/c/dc14753664240cedf669623b27ae9922b0618b25"
}
],
"title": "accel/amdxdna: return early from a zero-length flush",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89978",
"datePublished": "2026-09-16T10:32:55.928Z",
"dateReserved": "2026-09-11T19:38:34.779Z",
"dateUpdated": "2026-09-16T10:32:55.928Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-89978\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:08.667\",\"lastModified\":\"2026-09-16T11:17:08.667\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\naccel/amdxdna: return early from a zero-length flush\\n\\nSYNC_BO does not constrain its size, so a request for zero bytes reaches\\ndrm_clflush_virt_range(), which ends with an unconditional\\nclflushopt(end - 1). For an empty range that is the byte before the\\nmapping, and abo-\u003emem.kva comes from vmap(), so the access lands in the\\nguard page below the vmalloc area and faults:\\n\\n BUG: unable to handle page fault for address: ffffd16fbbc70fff\\n #PF: supervisor read access in kernel mode\\n Oops: Oops: 0000 [#1] SMP NOPTI\\n CPU: 7 UID: 1000 Comm: sync_bo_probe\\n RIP: 0010:drm_clflush_virt_range+0x3c/0x70\\n Call Trace:\\n amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]\\n drm_ioctl+0x301/0x4c0\\n __x64_sys_ioctl+0x115/0x2f0\\n do_syscall_64+0xa6/0x3d0\\n\\nAny process that can open the render node can do this. Reproduced 3 of 3\\ntimes on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on\\nan AMDXDNA_BO_SHARE object. The import arm takes the same request but\\nflushes the whole scatterlist, so it survives it.\\n\\nNothing needs flushing for an empty range, so answer before choosing a\\npath.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/accel/amdxdna/amdxdna_gem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e252e3f3488a49267e08ea7d972ac5ba3f2f1763\",\"lessThan\":\"45962da5821d0a691f638ccb13842889156d8969\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e252e3f3488a49267e08ea7d972ac5ba3f2f1763\",\"lessThan\":\"f00def884a831dc49eb659dac2dd09dbfd21e67f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e252e3f3488a49267e08ea7d972ac5ba3f2f1763\",\"lessThan\":\"dc14753664240cedf669623b27ae9922b0618b25\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/accel/amdxdna/amdxdna_gem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/45962da5821d0a691f638ccb13842889156d8969\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc14753664240cedf669623b27ae9922b0618b25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f00def884a831dc49eb659dac2dd09dbfd21e67f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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