CVE-2026-89719

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxc0265342bff4fcaa2cdf13f4596244c18d4a7ae5 < e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739daffected
LinuxLinuxc0265342bff4fcaa2cdf13f4596244c18d4a7ae5 < 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3affected
LinuxLinuxc0265342bff4fcaa2cdf13f4596244c18d4a7ae5 < 391f057f44a51cc9418da5cba78b014324174264affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References