GHSA-4J75-GGWR-GG59
Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31In the Linux kernel, the following vulnerability has been resolved:
s390/dasd: Fix undersized format-check buffer
fmt_buffer_size in dasd_eckd_check_device_format() is declared as int, even though one of the multiplicands, sizeof(struct eckd_count), is a size_t. The expression
trkcount * rpt_max * sizeof(struct eckd_count)
is therefore correctly evaluated at 64-bit width, but the result is silently truncated when it is stored back into the 32-bit fmt_buffer_size variable. For a sufficiently large track range (start_unit/stop_unit are caller-controlled) this truncation yields a buffer size far smaller than the number of tracks actually requested. kzalloc() then succeeds with an undersized allocation, while the subsequent channel program build still operates on the untruncated track count and writes past the end of that buffer.
Compute the buffer size with check_mul_overflow() and keep it in a size_t, so that a value that no longer fits results in -EINVAL instead of a silently truncated allocation size.
{
"affected": [],
"aliases": [
"CVE-2026-80710"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-28T08:16:56Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Fix undersized format-check buffer\n\nfmt_buffer_size in dasd_eckd_check_device_format() is declared as\nint, even though one of the multiplicands, sizeof(struct eckd_count),\nis a size_t. The expression\n\n trkcount * rpt_max * sizeof(struct eckd_count)\n\nis therefore correctly evaluated at 64-bit width, but the result is\nsilently truncated when it is stored back into the 32-bit\nfmt_buffer_size variable. For a sufficiently large track range\n(start_unit/stop_unit are caller-controlled) this truncation\nyields a buffer size far smaller than the number of tracks actually\nrequested. kzalloc() then succeeds with an undersized allocation,\nwhile the subsequent channel program build still operates on the\nuntruncated track count and writes past the end of that buffer.\n\nCompute the buffer size with check_mul_overflow() and keep it in a\nsize_t, so that a value that no longer fits results in -EINVAL\ninstead of a silently truncated allocation size.",
"id": "GHSA-4j75-ggwr-gg59",
"modified": "2026-08-28T09:31:50Z",
"published": "2026-08-28T09:31:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80710"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857"
}
],
"schema_version": "1.4.0",
"severity": []
}
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.
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- 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.