GHSA-72FX-6P3V-7C2X
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32In the Linux kernel, the following vulnerability has been resolved:
ext4: fix buffer_head leak in ext4_init_orphan_info
ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh.
If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped.
This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths.
Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.
{
"affected": [],
"aliases": [
"CVE-2026-92494"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:51Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix buffer_head leak in ext4_init_orphan_info\n\next4_init_orphan_info() reads orphan file blocks with ext4_bread()\nand stores the returned buffer_head in oi-\u003eof_binfo[i].ob_bh.\n\nIf ext4_bread() succeeds but the orphan block magic or checksum\nvalidation fails, the function jumps to out_free. However, the old\nout_free loop starts releasing buffers from i - 1, so the current\nbuffer_head at index i is skipped.\n\nThis leaks the buffer_head reference obtained by ext4_bread() on the\nbad magic and bad checksum error paths.\n\nFix this by tracking the number of successfully read buffer_heads and\nreleasing exactly those buffer_heads on the error path.",
"id": "GHSA-72fx-6p3v-7c2x",
"modified": "2026-09-17T18:32:06Z",
"published": "2026-09-17T18:32:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92494"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954"
}
],
"schema_version": "1.4.0",
"severity": []
}
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