mm: hugetlb: fix UAF in hugetlb_handle_userfault
In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: fix UAF in hugetlb_handle_userfault The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race, hugetlb_fault hugetlb_no_page /*unlock vma_lock */ hugetlb_handle_userfault handle_userfault /* unlock mm->mmap_lock*/ vm_mmap_pgoff do_mmap mmap_region munmap_vma_range /* clean old vma */ /* lock vma_lock again <--- UAF */ /* unlock vma_lock */ Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue. [1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/ [2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/
CVE-2022-50630
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-2022-50630
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": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45",
"lessThan": "45c33966759ea1b4040c08dacda99ef623c0ca29",
"versionType": "git"
},
{
"status": "affected",
"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45",
"lessThan": "0db2efb3bff879566f05341d94c3de00ac95c4cc",
"versionType": "git"
},
{
"status": "affected",
"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45",
"lessThan": "dd691973f67b2800a97db723b1ff6f07fdcf7f5a",
"versionType": "git"
},
{
"status": "affected",
"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45",
"lessThan": "78504bcedb2f1bbfb353b4d233c24d641c4dda33",
"versionType": "git"
},
{
"status": "affected",
"version": "1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45",
"lessThan": "958f32ce832ba781ac20e11bb2d12a9352ea28fc",
"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": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.150",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.75",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "5.19.17",
"versionType": "semver",
"lessThanOrEqual": "5.19.*"
},
{
"status": "unaffected",
"version": "6.0.3",
"versionType": "semver",
"lessThanOrEqual": "6.0.*"
},
{
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/hugetlb.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2022-50630
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30222 · Revision 1
- Added to Heist Feed
- Publisher date