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CVE-2022-50446

ARC: mm: fix leakage of memory allocated for PTE

Medium5.5EPSS 0.16%
Published
Updated
Reserved
Assigned by
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ARC: mm: fix leakage of memory allocated for PTE Since commit d9820ff ("ARC: mm: switch pgtable_t back to struct page *") a memory leakage problem occurs. Memory allocated for page table entries not released during process termination. This issue can be reproduced by a small program that allocates a large amount of memory. After several runs, you'll see that the amount of free memory has reduced and will continue to reduce after each run. All ARC CPUs are effected by this issue. The issue was introduced since the kernel stable release v5.15-rc1. As described in commit d9820ff after switch pgtable_t back to struct page *, a pointer to "struct page" and appropriate functions are used to allocate and free a memory page for PTEs, but the pmd_pgtable macro hasn't changed and returns the direct virtual address from the PMD (PGD) entry. Than this address used as a parameter in the __pte_free() and as a result this function couldn't release memory page allocated for PTEs. Fix this issue by changing the pmd_pgtable macro and returning pointer to struct page.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 7 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2022-50446, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

  • Linux · Linux

    • affected d9820ff76f95fa26d33e412254a89cd65b23142d – < 14009ada5712649589ab4ad0441b811780ea8773
    • affected d9820ff76f95fa26d33e412254a89cd65b23142d – < d83a69966e8b6ae9dd447f3ac704c0223bceb7f7
    • affected d9820ff76f95fa26d33e412254a89cd65b23142d – < 4fd9df10cb7a9289fbd22d669f9f98164d95a1ce

  • Linux · Linux

    • affected 5.15
    • unaffected < 5.15
    • unaffected 5.15.77 – ≤ 5.15.*
    • unaffected 6.0.7 – ≤ 6.0.*
    • unaffected 6.1 – ≤ *

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .