CVE-2025-39941 - zram: fix slot write race condition

CVE-2025-39941 - zram: fix slot write race condition

https://cvefeed.io/rssfeed/latest.atom / Sat, 10/04/2025 - 11:42
CVE ID : CVE-2025-39941
Published : 4. Oktober 2025 08:15 | 1 Stunde, 24 Minuten ago
Description : In the Linux kernel, the following vulnerability has been resolved: zram: fix slot write race condition Parallel concurrent writes to the same zram index result in leaked zsmalloc handles. Schematically we can have something like this: CPU0 CPU1 zram_slot_lock() zs_free(handle) zram_slot_lock() zram_slot_lock() zs_free(handle) zram_slot_lock() compress compress handle = zs_malloc() handle = zs_malloc() zram_slot_lock zram_set_handle(handle) zram_slot_lock zram_slot_lock zram_set_handle(handle) zram_slot_lock Either CPU0 or CPU1 zsmalloc handle will leak because zs_free() is done too early. In fact, we need to reset zram entry right before we set its new handle, all under the same slot lock scope.
Severity: 0.0 | NA
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