mm/hugetlb: fix list corruption in allocate_file_region_entries()
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix list corruption in allocate_file_region_entries() allocate_file_region_entries() tops up resv->region_cache with freshly allocated file_region descriptors. The allocation uses GFP_KERNEL, so resv->lock is dropped around it: the new entries are gathered on a stack-local list head, allocated_regions, and spliced into resv->region_cache once the lock is re-acquired. The splice used list_splice(), which moves the entries but does not re-initialize the source head, so allocated_regions is left pointing at an entry that now lives on resv->region_cache. The top-up runs in a while loop that re-checks the cache deficit after re-acquiring the lock. For a shared mapping the resv_map is shared by every mapper of the hugetlbfs inode, so a concurrent region_chg()/region_add()/region_del() on the same resv_map can consume cache entries during the unlocked window and force a second iteration. That iteration calls list_add() on the stale head and corrupts the list; with CONFIG_DEBUG_LIST the __list_add_valid() check trips: list_add corruption. next->prev should be prev (ffffc900011ff7f8), but was ffff88814c281460. (next=ffff88814c545640). kernel BUG at lib/list_debug.c:31! allocate_file_region_entries+0x191/0x420 region_chg+0x267/0x300 hugetlb_reserve_pages+0x387/0xc80 hugetlbfs_file_mmap+0x2ce/0x3f0 mmap_region+0x1348/0x1a80 do_mmap+0x85e/0xb90 vm_mmap_pgoff+0x18c/0x330 ksys_mmap_pgoff+0x2a1/0x3e0 do_syscall_
CVE-2026-74518
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74518
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "01b8569233e47693d6ff7efa96d9854c55f936fc",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "9c5fdffc5e1ce84403c58289ee72697051803bf7",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "62e1c2741a4d923d9854efd5927a6212aad7a187",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "587a0accc2b4fccc5cf7baf0fe34e50efde51f9c",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "ac1bb7fd45088d0db57a22ce7729f258ebd63cf5",
"versionType": "git"
},
{
"status": "affected",
"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f",
"lessThan": "dd9623f58ec702a07b2d67179d6fcea79c52231a",
"versionType": "git"
}
],
"programFiles": [
"mm/hugetlb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/hugetlb.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74518
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33192 · Revision 1
- Added to Heist Feed
- Publisher date