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CVE-2022-49210

Estado: ModificadaMedia (5.5)—

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.

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The memory leak can be easily detected by executing shell command: "while true; do ls > /dev/null; grep MemFree /proc/meminfo; done"

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: pgalloc: fix memory leak caused by pgd_free()\n\npgd page is freed by generic implementation pgd_free() since commit\nf9cb654cb550 (\"asm-generic: pgalloc: provide generic pgd_free()\"),\nhowever, there are scenarios that the system uses more than one page as\nthe pgd table, in such cases the generic implementation pgd_free() won't\nbe applicable anymore. For example, when PAGE_SIZE_4KB is enabled and\nMIPS_VA_BITS_48 is not enabled in a 64bit system, the macro \"PGD_ORDER\"\nwill be set as \"1\", which will cause allocating two pages as the pgd\ntable. Well, at the same time, the generic implementation pgd_free()\njust free one pgd page, which will result in the memory leak.\n\nThe memory leak can be easily detected by executing shell command:\n\"while true; do ls > /dev/null; grep MemFree /proc/meminfo; done\""
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: MIPS: pgalloc: reparar pérdida de memoria causada por pgd_free() La página pgd es liberada por la implementación genérica pgd_free() desde el commit f9cb654cb550 (\"asm-generic: pgalloc: proporcionar pgd_free() genérico\"), sin embargo, hay escenarios en los que el sistema usa más de una página como la tabla pgd, en tales casos la implementación genérica pgd_free() ya no será aplicable. Por ejemplo, cuando PAGE_SIZE_4KB está habilitado y MIPS_VA_BITS_48 no está habilitado en un sistema de 64 bits, la macro \"PGD_ORDER\" se establecerá como \"1\", lo que provocará la asignación de dos páginas como la tabla pgd. Bueno, al mismo tiempo, la implementación genérica pgd_free() solo libera una página pgd, lo que provocará la pérdida de memoria. La pérdida de memoria se puede detectar fácilmente ejecutando el comando de shell: \"while true; do ls > /dev/null; grep MemFree /proc/meminfo; done\""
    }
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  "lastModified": "2026-06-17T05:17:23.590",
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