VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-89719: Linux kernel · zram: fix out-of-bounds access in read_block_state()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f5e9f3a75efc774f17ab3f33826630d7fe30c7ea : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

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.
Patch: Available – fixed in f5e9f3a75efc774f17ab3f33826630d7fe30c7ea, e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d, 391f057f44a51cc9418da5cba78b014324174264 +2

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c0265342bff4fcaa2cdf13f4596244c18d4a7ae5, < f5e9f3a75efc774f17ab3f33826630d7fe30c7ea	Fixed in f5e9f3a75efc774f17ab3f33826630d7fe30c7ea
LinuxLinux	Affected ≥ c0265342bff4fcaa2cdf13f4596244c18d4a7ae5, < e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d	Fixed in e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d
LinuxLinux	Affected ≥ c0265342bff4fcaa2cdf13f4596244c18d4a7ae5, < 391f057f44a51cc9418da5cba78b014324174264	Fixed in 391f057f44a51cc9418da5cba78b014324174264
LinuxLinux	Affected ≥ c0265342bff4fcaa2cdf13f4596244c18d4a7ae5, < 6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b	Fixed in 6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b
LinuxLinux	Affected ≥ c0265342bff4fcaa2cdf13f4596244c18d4a7ae5, < 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3	Fixed in 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3
LinuxLinux	Affected =4.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: zram: fix out-of-bounds access in read_block_state() read_block_state() calculates nr_pages before taking dev_lock. If the device is reset and reinitialized with a smaller disksize before lock acquisition, nr_pages still describes the old table. The subsequent loop can then call slot_lock() past the end of the newly allocated table. Read disksize after acquiring dev_lock and checking that the device is initialized. The read lock then keeps the table and its bound stable for the duration of the scan.

References

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