ghsa-fpqf-cxvg-rf89
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
mm: zswap: fix missing folio cleanup in writeback race path
In zswap_writeback_entry(), after we get a folio from __read_swap_cache_async(), we grab the tree lock again to check that the swap entry was not invalidated and recycled. If it was, we delete the folio we just added to the swap cache and exit.
However, __read_swap_cache_async() returns the folio locked when it is newly allocated, which is always true for this path, and the folio is ref'd. Make sure to unlock and put the folio before returning.
This was discovered by code inspection, probably because this path handles a race condition that should not happen often, and the bug would not crash the system, it will only strand the folio indefinitely.
{
"affected": [],
"aliases": [
"CVE-2024-26832"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-17T10:15:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: zswap: fix missing folio cleanup in writeback race path\n\nIn zswap_writeback_entry(), after we get a folio from\n__read_swap_cache_async(), we grab the tree lock again to check that the\nswap entry was not invalidated and recycled. If it was, we delete the\nfolio we just added to the swap cache and exit.\n\nHowever, __read_swap_cache_async() returns the folio locked when it is\nnewly allocated, which is always true for this path, and the folio is\nref\u0027d. Make sure to unlock and put the folio before returning.\n\nThis was discovered by code inspection, probably because this path handles\na race condition that should not happen often, and the bug would not crash\nthe system, it will only strand the folio indefinitely.",
"id": "GHSA-fpqf-cxvg-rf89",
"modified": "2024-04-17T12:32:03Z",
"published": "2024-04-17T12:32:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26832"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1d"
}
],
"schema_version": "1.4.0",
"severity": []
}