CVE-2022-49080
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.
Does this matter?
Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.
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); }
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.31% probability · 23th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-401
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648Patch
- https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05bPatch
- https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93dPatch
- https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03ePatch
- https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999Patch
- https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21Patch
- https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6Patch
- https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894Patch
- https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.