CVE-2026-93216: Linux kernel · mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e7c1923c5f30a6953f0540e3171d882ec17b05d3 : update Linux kernel when convenient.
Data as of 27 Oct 2026, 05:11 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in e7c1923c5f30a6953f0540e3171d882ec17b05d3, a4c940ab3f794f221a338c9431ad1ce0d73a2bea, 46761406e14381dc35f498c247a87565b87ea2ef +1
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to e7c1923c5f30a6953f0540e3171d882ec17b05d3, a4c940ab3f794f221a338c9431ad1ce0d73a2bea, 46761406e14381dc35f498c247a87565b87ea2ef or 90f095b816e25c6a9e4446d299bac5007fdcb3df.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
This vulnerability has been fixed in specific Linux kernel commits (e7c1923c5f30a6953f0540e3171d882ec17b05d3, a4c940ab3f794f221a338c9431ad1ce0d73a2bea, 46761406e14381dc35f498c247a87565b87ea2ef, 90f095b816e25c6a9e4446d299bac5007fdcb3df). Users and administrators should update to a Linux kernel version that includes these fixes. No additional mitigation is required beyond applying the official patch.
Description
A time-of-check to time-of-use (TOCTOU) vulnerability exists in the Linux kernel's print_page_owner_memcg() function. The function reads page->memcg_data multiple times without proper synchronization, which can lead to kernel crashes on debug builds if the page is concurrently freed and reallocated. The issue affects Linux kernel version 5.18 and has been fixed by using a memcg_data snapshot throughout the function to avoid TOCTOU conditions.
References
- git.kernel.org/stable/c/e7c1923c5f30a6953f0540e3171d882ec17b05d3 (opens in a new tab)
- git.kernel.org/stable/c/a4c940ab3f794f221a338c9431ad1ce0d73a2bea (opens in a new tab)
- git.kernel.org/stable/c/46761406e14381dc35f498c247a87565b87ea2ef (opens in a new tab)
- git.kernel.org/stable/c/90f095b816e25c6a9e4446d299bac5007fdcb3df (opens in a new tab)