CVE-2022-49080: mm/mempolicy: fix mpol_new leak in shared_policy_replace
Vulnerability summary
CVE-2022-49080 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 24.1% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 29 · Related 27Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.31%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.31% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu106 products
- linuxAll versions (No fix recorded) | < 4.15.0-189.200 | < 5.4.0-117.132 | < 5.15.0-37.39
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1137.148 | < 5.4.0-1078.84 | < 5.15.0-1011.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 8510c2346d9e47a72b7f018a36ef0c39483e53d6 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 5e16dc5378abd749a836daa9ee4ab2c8d2668999 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 39a32f3c06f6d68a530bf9612afa19f50f12e93d | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < f7e183b0a7136b6dc9c7b9b2a85a608a8feba894 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 198932a14aeb19a15cf19e51e151d023bc4cd648 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 6e00309ac716fa8225f0cbde2cd9c24f0e74ee21 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < fe39ac59dbbf893b73b24e3184161d0bd06d6651 | ≥ 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 4ad099559b00ac01c3726e5c95dc3108ef47d03e | 3.8
- linux_kernel≥ 3.8.1, < 4.9.311 | ≥ 4.10, < 4.14.276 | ≥ 4.15, < 4.19.238 | ≥ 4.20, < 5.4.189 | ≥ 5.5, < 5.10.111 | ≥ 5.11, < 5.15.34 | ≥ 5.16, < 5.16.20 | ≥ 5.17, < 5.17.3 | 3.8 | 3.8:rc2 | 3.8:rc3 | 3.8:rc4 | 3.8:rc5 | 3.8:rc6 | 3.8:rc7 | 5.18:rc1
Debian1 product
- linux< 5.17.3-1
3 vendors · 109 products
