Vulnerability Details CVE-2025-39941
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.3%
CVSS Severity
CVSS v3 Score 4.7
References
Products affected by CVE-2025-39941
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cpe:2.3:o:linux:linux_kernel:6.14
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cpe:2.3:o:linux:linux_kernel:6.14.1
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cpe:2.3:o:linux:linux_kernel:6.14.10
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cpe:2.3:o:linux:linux_kernel:6.14.11
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cpe:2.3:o:linux:linux_kernel:6.14.2
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cpe:2.3:o:linux:linux_kernel:6.14.3
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cpe:2.3:o:linux:linux_kernel:6.14.4
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cpe:2.3:o:linux:linux_kernel:6.14.5
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cpe:2.3:o:linux:linux_kernel:6.14.6
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cpe:2.3:o:linux:linux_kernel:6.14.7
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cpe:2.3:o:linux:linux_kernel:6.14.8
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cpe:2.3:o:linux:linux_kernel:6.14.9
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cpe:2.3:o:linux:linux_kernel:6.15
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cpe:2.3:o:linux:linux_kernel:6.15.1
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cpe:2.3:o:linux:linux_kernel:6.15.10
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cpe:2.3:o:linux:linux_kernel:6.15.11
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cpe:2.3:o:linux:linux_kernel:6.15.2
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cpe:2.3:o:linux:linux_kernel:6.15.3
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cpe:2.3:o:linux:linux_kernel:6.15.4
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cpe:2.3:o:linux:linux_kernel:6.15.5
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cpe:2.3:o:linux:linux_kernel:6.15.6
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cpe:2.3:o:linux:linux_kernel:6.15.7
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cpe:2.3:o:linux:linux_kernel:6.15.8
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cpe:2.3:o:linux:linux_kernel:6.15.9
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cpe:2.3:o:linux:linux_kernel:6.16
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cpe:2.3:o:linux:linux_kernel:6.16.1
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cpe:2.3:o:linux:linux_kernel:6.16.2
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cpe:2.3:o:linux:linux_kernel:6.16.3
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cpe:2.3:o:linux:linux_kernel:6.16.4
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cpe:2.3:o:linux:linux_kernel:6.16.5
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cpe:2.3:o:linux:linux_kernel:6.16.6
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cpe:2.3:o:linux:linux_kernel:6.16.7
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cpe:2.3:o:linux:linux_kernel:6.16.8
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cpe:2.3:o:linux:linux_kernel:6.17