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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49080

mm/mempolicy: fix mpol_new leak in shared_policy_replace

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Status
Published
Published
Updated
Assigning organization
Linux

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); }

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 8510c2346d9e47a72b7f018a36ef0c39483e53d6affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 5e16dc5378abd749a836daa9ee4ab2c8d2668999affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 39a32f3c06f6d68a530bf9612afa19f50f12e93daffected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05baffected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < f7e183b0a7136b6dc9c7b9b2a85a608a8feba894affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 198932a14aeb19a15cf19e51e151d023bc4cd648affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 6e00309ac716fa8225f0cbde2cd9c24f0e74ee21affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < fe39ac59dbbf893b73b24e3184161d0bd06d6651affected
  • 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 to < 4ad099559b00ac01c3726e5c95dc3108ef47d03eaffected

Linux Linux

Default version status: affected

  • 3.8affected
  • 0 to < 3.8unaffected
  • 4.9.311 to ≤ 4.9.*unaffected
  • 4.14.276 to ≤ 4.14.*unaffected
  • 4.19.238 to ≤ 4.19.*unaffected
  • 5.4.189 to ≤ 5.4.*unaffected
  • 5.10.111 to ≤ 5.10.*unaffected
  • 5.15.34 to ≤ 5.15.*unaffected
  • 5.16.20 to ≤ 5.16.*unaffected
  • 5.17.3 to ≤ 5.17.*unaffected
  • 5.18 to ≤ *unaffected

References