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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory

CVE-2024-40901

Description

In the Linux kernel, the following vulnerability has been resolved:

scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory

There is a potential out-of-bounds access when using test_bit() on a single word. The test_bit() and set_bit() functions operate on long values, and when testing or setting a single word, they can exceed the word boundary. KASAN detects this issue and produces a dump:

BUG: KASAN: slab-out-of-bounds in _scsih_add_device.constprop.0 (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 drivers/scsi/mpt3sas/mpt3sas_scsih.c:7331) mpt3sas

Write of size 8 at addr ffff8881d26e3c60 by task kworker/u1536:2/2965

For full log, please look at [1].

Make the allocation at least the size of sizeof(unsigned long) so that set_bit() and test_bit() have sufficient room for read/write operations without overwriting unallocated memory.

[1] Link: https://lore.kernel.org/all/ZkNcALr3W3KGYYJG@gmail.com/

Affected products

155

Patches

8
18abb5db0aa9
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
4254dfeda82f
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9079338c5a0d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
46bab2bcd771
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
521f333e644c
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
0081d2b3ae0a
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
19649e49a6df
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
e9bce7c751f6
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

0

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