GHSA-RHF9-9Q5C-JR4G
Vulnerability from github – Published: 2025-10-21 12:31 – Updated: 2025-10-21 12:31In the Linux kernel, the following vulnerability has been resolved:
ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state
The EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that we are in the middle of replay the fast commit journal. This was actually a mistake, since the sbi->s_mount_info is initialized from es->s_state. Arguably s_mount_state is misleadingly named, but the name is historical --- s_mount_state and s_state dates back to ext2.
What should have been used is the ext4_{set,clear,test}mount_flag() inline functions, which sets EXT4_MF* bits in sbi->s_mount_flags.
The problem with using EXT4_FC_REPLAY is that a maliciously corrupted superblock could result in EXT4_FC_REPLAY getting set in s_mount_state. This bypasses some sanity checks, and this can trigger a BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter out the EXT4_FC_REPLAY bit for now. We should eventually transition away from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.
{
"affected": [],
"aliases": [
"CVE-2022-49348"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:11Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state\n\nThe EXT4_FC_REPLAY bit in sbi-\u003es_mount_state is used to indicate that\nwe are in the middle of replay the fast commit journal. This was\nactually a mistake, since the sbi-\u003es_mount_info is initialized from\nes-\u003es_state. Arguably s_mount_state is misleadingly named, but the\nname is historical --- s_mount_state and s_state dates back to ext2.\n\nWhat should have been used is the ext4_{set,clear,test}_mount_flag()\ninline functions, which sets EXT4_MF_* bits in sbi-\u003es_mount_flags.\n\nThe problem with using EXT4_FC_REPLAY is that a maliciously corrupted\nsuperblock could result in EXT4_FC_REPLAY getting set in\ns_mount_state. This bypasses some sanity checks, and this can trigger\na BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter\nout the EXT4_FC_REPLAY bit for now. We should eventually transition\naway from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.",
"id": "GHSA-rhf9-9q5c-jr4g",
"modified": "2025-10-21T12:31:25Z",
"published": "2025-10-21T12:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49348"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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