What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

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.

Affected products

• Linux: 4.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/26a55336be91004dbd438f3b89b0c31617459976
• https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264
• https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3
• https://git.kernel.org/stable/c/6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b
• https://git.kernel.org/stable/c/a189cae92e97d90a9553740f5558d6f74446d3d1
• https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d
• https://git.kernel.org/stable/c/f5e9f3a75efc774f17ab3f33826630d7fe30c7ea
• https://git.kernel.org/stable/c/fee53224c8261541cf310b57ac7c77a80e144483

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