CVE-2025-21671
In the Linux kernel, the following vulnerability has been resolved: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL. Which will potentially cause zram_meta_free to access the table if user reset an failed and uninitialized device.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.22% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/212fe1c0df4a150fb6298db2cfff267ceaba5402Patch
- https://git.kernel.org/stable/c/571d3f6045cd3a6d9f6aec33b678f3ffe97582efPatch
- https://git.kernel.org/stable/c/902ef8f16d5ca77edc77c30656be54186c1e99b7Patch
- https://git.kernel.org/stable/c/fe3de867f94819ba0f28e035c0b0182150147d95Patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.