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CVE-2022-49080 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648
https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b
https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d
https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e
https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999
https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21
https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6
https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894
https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2022-49080
NVD Published Date:
02/26/2025
NVD Last Modified:
02/26/2025
Source:
kernel.org