mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()
In the Linux kernel, the following vulnerability has been resolved: mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg() print_page_owner_memcg() reads page->memcg_data via READ_ONCE() at the start to guard against tail pages and NULL data. However, it later re-reads page->memcg_data locklessly in two places: 1: page_memcg_check(page) 2: PageMemcgKmem(page) (via folio_memcg_kmem(), which includes VM_BUG_ON assertions for tail pages and MEMCG_DATA_OBJEXTS) If the page is concurrently freed and reallocated as a THP tail page or slab page between these calls, the VM_BUG_ON assertions can trigger on CONFIG_DEBUG_VM=y builds, crashing the kernel. Fix both TOCTOU issues by using the memcg_data snapshot throughout.
CVE-2026-93216
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-2026-93216
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": "fcf8935832b86d3437f00e732c6d0d4d2819d6a9",
"lessThan": "e7c1923c5f30a6953f0540e3171d882ec17b05d3",
"versionType": "git"
},
{
"status": "affected",
"version": "fcf8935832b86d3437f00e732c6d0d4d2819d6a9",
"lessThan": "a4c940ab3f794f221a338c9431ad1ce0d73a2bea",
"versionType": "git"
},
{
"status": "affected",
"version": "fcf8935832b86d3437f00e732c6d0d4d2819d6a9",
"lessThan": "46761406e14381dc35f498c247a87565b87ea2ef",
"versionType": "git"
},
{
"status": "affected",
"version": "fcf8935832b86d3437f00e732c6d0d4d2819d6a9",
"lessThan": "90f095b816e25c6a9e4446d299bac5007fdcb3df",
"versionType": "git"
}
],
"programFiles": [
"mm/page_owner.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/page_owner.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93216
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48735 · Revision 1
- Added to Heist Feed
- Publisher date