GHSA-C238-677W-2P87
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size
vc4_overflow_mem_work() points BPOA at a 512KB slot inside the 16MB binner BO, but writes the size of the whole BO to BPOS. On every binner out-of-memory event the PTB is therefore authorized to write tile lists across all the other slots (which may hold the tile state, tile alloc and overflow memory of in-flight jobs) and, for any slot but the first, past the end of the binner BO into unrelated CMA memory.
Since CMA pages are recycled into page cache and user allocations, this is arbitrary memory corruption by GPU DMA. In practice it shows up as GPU hangs with corrupted control list pointers, userspace heap corruption, a GPU that stays permanently wedged after the first hang, and occasional full system crashes, whenever a job overflows the initial binner slot.
The bug dates back to the conversion from a dedicated overflow BO (where writing the full BO size was correct) to the slotted binner BO.
{
"affected": [],
"aliases": [
"CVE-2026-74454"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:17:50Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size\n\nvc4_overflow_mem_work() points BPOA at a 512KB slot inside the 16MB\nbinner BO, but writes the size of the whole BO to BPOS. On every binner\nout-of-memory event the PTB is therefore authorized to write tile lists\nacross all the other slots (which may hold the tile state, tile alloc and\noverflow memory of in-flight jobs) and, for any slot but the first, past\nthe end of the binner BO into unrelated CMA memory.\n\nSince CMA pages are recycled into page cache and user allocations, this\nis arbitrary memory corruption by GPU DMA. In practice it shows up as GPU\nhangs with corrupted control list pointers, userspace heap corruption, a\nGPU that stays permanently wedged after the first hang, and occasional\nfull system crashes, whenever a job overflows the initial binner slot.\n\nThe bug dates back to the conversion from a dedicated overflow BO (where\nwriting the full BO size was correct) to the slotted binner BO.",
"id": "GHSA-c238-677w-2p87",
"modified": "2026-08-19T18:32:27Z",
"published": "2026-08-15T15:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74454"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0badb30871004d34df87be33e853536f0b69885f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1e33ca7f44be64beed2735bb76b86eb65ba8c05b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2f2291a119e9a8b696ae8bb36e86b75d272ceaea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6395789e4739aa5177bbec0fa0f07ccc38d249b0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6cd5acf6f87c073622bd61e38fe99c47365cda9c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bb5656ae063f2711f56438cf2f1f5b613aea5f12"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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.
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.