CVE-2022-49210
MIPS: pgalloc: fix memory leak caused by pgd_free()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: MIPS: pgalloc: fix memory leak caused by pgd_free() pgd page is freed by generic implementation pgd_free() since commit f9cb654cb550 ("asm-generic: pgalloc: provide generic pgd_free()"), however, there are scenarios that the system uses more than one page as the pgd table, in such cases the generic implementation pgd_free() won't be applicable anymore. For example, when PAGE_SIZE_4KB is enabled and MIPS_VA_BITS_48 is not enabled in a 64bit system, the macro "PGD_ORDER" will be set as "1", which will cause allocating two pages as the pgd table. Well, at the same time, the generic implementation pgd_free() just free one pgd page, which will result in the memory leak. The memory leak can be easily detected by executing shell command: "while true; do ls > /dev/null; grep MemFree /proc/meminfo; done"
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 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)
- 0.26% · top 82% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected f9cb654cb550b7b87e8608b14fc3eca432429ffe – < fa3d44424579972cc7c4fac3d9cf227798ebdfa0
- affected f9cb654cb550b7b87e8608b14fc3eca432429ffe – < d29cda15cab086d82d692de016f7249545d4b6b4
- affected f9cb654cb550b7b87e8608b14fc3eca432429ffe – < 5a8501d34b261906e4c76ec9da679f2cb4d309ed
- affected f9cb654cb550b7b87e8608b14fc3eca432429ffe – < 1bf0d78c8cc3cf615a6e7bf33ada70b73592f0a1
- affected f9cb654cb550b7b87e8608b14fc3eca432429ffe – < 2bc5bab9a763d520937e4f3fe8df51c6a1eceb97
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.110 – ≤ 5.10.*
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (5)
- https://git.kernel.org/stable/c/fa3d44424579972cc7c4fac3d9cf227798ebdfa0 (opens in a new tab)
- https://git.kernel.org/stable/c/d29cda15cab086d82d692de016f7249545d4b6b4 (opens in a new tab)
- https://git.kernel.org/stable/c/5a8501d34b261906e4c76ec9da679f2cb4d309ed (opens in a new tab)
- https://git.kernel.org/stable/c/1bf0d78c8cc3cf615a6e7bf33ada70b73592f0a1 (opens in a new tab)
- https://git.kernel.org/stable/c/2bc5bab9a763d520937e4f3fe8df51c6a1eceb97 (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-2022-49210)Record last updated .