CVE-2026-89719: Linux kernel · zram: fix out-of-bounds access in read_block_state()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · 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.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel. Users should update to patched kernel versions that include this fix. Since this is not a cloud service, remediation requires applying the updated kernel packages from the vendor or distribution. Patch status is not explicitly confirmed in the provided data; users should consult their vendor or distribution advisory for the latest remediation guidance.
Description
A vulnerability in the Linux kernel's zram module involves an out-of-bounds access in the read_block_state() function. The function calculates the number of pages before acquiring a device lock, which can lead to accessing memory beyond the bounds if the device is reset and reinitialized with a smaller disk size. This issue has been resolved by reading the disk size after acquiring the lock and ensuring the device is initialized before proceeding.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89719 (opens in a new tab)
- git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264 (opens in a new tab)
- git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 (opens in a new tab)
- git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d (opens in a new tab)
- ubuntu.com/security/CVE-2026-89719 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89719 (opens in a new tab)
- git.kernel.org/linus/391f057f44a51cc9418da5cba78b014324174264 (opens in a new tab)
- git.kernel.org/stable/c/6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b (opens in a new tab)
- git.kernel.org/stable/c/f5e9f3a75efc774f17ab3f33826630d7fe30c7ea (opens in a new tab)