GHSA-39W7-PR2V-3X67
Vulnerability from github – Published: 2025-12-09 18:30 – Updated: 2025-12-09 18:30In the Linux kernel, the following vulnerability has been resolved:
ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example:
__erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF!
Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show().
Fetch a reproducer in [Link].
{
"affected": [],
"aliases": [
"CVE-2023-53826"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-09T16:17:21Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()\n\nWear-leveling entry could be freed in error path, which may be accessed\nagain in eraseblk_count_seq_show(), for example:\n\n__erase_worker eraseblk_count_seq_show\n wl = ubi-\u003elookuptbl[*block_number]\n\t\t\t\tif (wl)\n wl_entry_destroy\n ubi-\u003elookuptbl[e-\u003epnum] = NULL\n kmem_cache_free(ubi_wl_entry_slab, e)\n\t\t erase_count = wl-\u003eec // UAF!\n\nWear-leveling entry updating/accessing in ubi-\u003elookuptbl should be\nprotected by ubi-\u003ewl_lock, fix it by adding ubi-\u003ewl_lock to serialize\nwl entry accessing between wl_entry_destroy() and\neraseblk_count_seq_show().\n\nFetch a reproducer in [Link].",
"id": "GHSA-39w7-pr2v-3x67",
"modified": "2025-12-09T18:30:33Z",
"published": "2025-12-09T18:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53826"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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