CVE-2026-45921: mtd: parsers: Fix memory leak in mtd_parser_tplink_safeloader_parse()
In the Linux kernel, the following vulnerability has been resolved:
mtd: parsers: Fix memory leak in mtdparsertplinksafeloaderparse()
The function mtdparsertplinksafeloaderparse() allocates buf via mtdparsertplinksafeloaderreadtable(). If the allocation for parts[idx].name fails inside the loop, the code jumps to the errfree label without freeing buf, leading to a memory leak.
Fix this by freeing the temporary buffer buf in the errfree label.
Compile tested only. Issue found using a prototype static analysis tool and code review.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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Free the temporary buffer buf in the err_free label of mtd_parser_tplink_safeloader_parse(), including when allocation of parts[idx].name fails inside the loop.
Event History
Frequently Asked Questions
What conditions are required to trigger the leak?
The TP-Link SafeLoader MTD parser must reach the partition-processing loop, and allocation of a partition name in parts[idx].name must fail. The vulnerability is a local, low-privilege issue according to the supplied vector.
What is the impact if the vulnerable error path is reached?
The temporary buffer allocated by mtd_parser_tplink_safeloader_read_table() is not freed when partition-name allocation fails. This causes a memory leak and may affect system availability.
How can I determine whether a system has the fix?
Check whether the kernel includes the fix that frees buf at the err_free label in mtd_parser_tplink_safeloader_parse(). The supplied references identify stable kernel commits for this change.