CVE-2022-49080
mm/mempolicy: fix mpol_new leak in shared_policy_replace
- Published
- Updated
- Reserved
- Assigned by
- 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); }
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 8510c2346d9e47a72b7f018a36ef0c39483e53d6
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 5e16dc5378abd749a836daa9ee4ab2c8d2668999
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 39a32f3c06f6d68a530bf9612afa19f50f12e93d
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < f7e183b0a7136b6dc9c7b9b2a85a608a8feba894
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 198932a14aeb19a15cf19e51e151d023bc4cd648
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 6e00309ac716fa8225f0cbde2cd9c24f0e74ee21
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < fe39ac59dbbf893b73b24e3184161d0bd06d6651
- affected 42288fe366c4f1ce7522bc9f27d0bc2a81c55264 – < 4ad099559b00ac01c3726e5c95dc3108ef47d03e
- affected 3.8
- unaffected < 3.8
- unaffected 4.9.311 – ≤ 4.9.*
- unaffected 4.14.276 – ≤ 4.14.*
- unaffected 4.19.238 – ≤ 4.19.*
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.111 – ≤ 5.10.*
- unaffected 5.15.34 – ≤ 5.15.*
- unaffected 5.16.20 – ≤ 5.16.*
- unaffected 5.17.3 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (9)
- https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6 (opens in a new tab)
- https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999 (opens in a new tab)
- https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d (opens in a new tab)
- https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b (opens in a new tab)
- https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894 (opens in a new tab)
- https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648 (opens in a new tab)
- https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21 (opens in a new tab)
- https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651 (opens in a new tab)
- https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49080)Record last updated .