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vuln-cve/data/2026/80xxx/CVE-2026-80591.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80591",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.770Z",
"datePublished": "2026-08-28T06:48:19.617Z",
"dateUpdated": "2026-08-29T06:21:06.412Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-29T06:21:06.412Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix listxattr handling of corrupted xattr entries\n\nValidate the xattr entry before reading its fields in f2fs_listxattr().\nReturn -EFSCORRUPTED when the entry is outside the valid xattr storage\narea instead of returning a successful partial result."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached via local listxattr/flistxattr/listxattrat syscalls through vfs_listxattr into f2fs_listxattr; f2fs is a local block filesystem (Android userdata, embedded flash) and although nfsd/ksmbd can call vfs_listxattr this is a secondary path requiring pre-existing on-disk corruption.\nAC:L - Once a crafted f2fs image with corrupted xattr entry sizes is mounted, the attacker deterministically controls the on-disk layout that makes list_for_each_xattr iterate past last_base_addr; no race, special memory layout, or rare kernel config is required beyond standard CONFIG_F2FS_FS_XATTR.\nPR:L - Planting malformed on-disk xattr metadata requires offline image crafting plus CAP_SYS_ADMIN to loop-mount (obtainable in an unprivileged user namespace) or root for raw block writes; triggering listxattr only needs normal file access on the attacker-controlled mount with no capability checks beyond LSM hooks on the syscall path.\nUI:N - In the highest-impact self-contained attack the attacker crafts a malicious f2fs image and mounts it inside their own user namespace, then calls listxattr on their own inode with no victim action such as opening a file or inserting removable media required.\nS:U - The out-of-bounds read corrupts or leaks kernel heap memory within the same kernel security domain; this is a standard local kernel memory-safety flaw, not a VM escape, container breakout, or IOMMU boundary bypass.\nC:H - Before bounds validation f2fs_listxattr reads entry->e_name_index and XATTR_NEXT_ENTRY() fields from xattr entries outside the valid storage area, causing slab out-of-bounds reads of adjacent kernel heap objects that can disclose kernel pointers and sensitive kernel data.\nI:H - Although the immediate fault is a read past bounds rather than a write, this is kernel heap memory corruption class behavior; adjacent-slab reads are routinely chained into further kernel exploitation via heap grooming for arbitrary write and code execution, so I:H applies when uncertain.\nA:H - Reading xattr entry fields beyond the kmalloc-allocated buffer can fault the kernel with a slab out-of-bounds access or oops under KASAN/hardening; f2fs_handle_error may log corruption but does not prevent the out-of-bounds read from destabilizing the system on each listxattr invocation."
}
]
}
],
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
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{
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"references": [
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"url": "https://git.kernel.org/stable/c/7dfac47e4189692f35230f3064acf2540e6d75fe"
},
{
"url": "https://git.kernel.org/stable/c/c8a10f174316e80d577e6549099b71a7a2111f3f"
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{
"url": "https://git.kernel.org/stable/c/dfa4891c27bccbd83d511a065721e85621f275a1"
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{
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{
"url": "https://git.kernel.org/stable/c/7dd01f7d0291583e3e5420c95c7d584e114899bd"
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{
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{
"url": "https://git.kernel.org/stable/c/5ef5bc304f23c3fe255d4936472378dcb74d0e94"
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],
"title": "f2fs: fix listxattr handling of corrupted xattr entries",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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