CVE-2022-49878

In the Linux kernel, the following vulnerability has been resolved: bpf, verifier: Fix memory leak in array reallocation for stack state If an error (NULL) is returned by krealloc(), callers of realloc_array() were setting their allocation pointers to NULL, but on error krealloc() does not touch the original allocation. This would result in a memory resource leak. Instead, free the old allocation on the error handling path. The memory leak information is as follows as also reported by Zhengchao: unreferenced object 0xffff888019801800 (size 256): comm "bpf_repo", pid 6490, jiffies 4294959200 (age 17.170s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0 [<0000000086712a0b>] krealloc+0x83/0xd0 [<00000000139aab02>] realloc_array+0x82/0xe2 [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186 [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341 [<0000000081780455>] do_check_common+0x5358/0xb350 [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d [<000000002973c690>] bpf_prog_load+0x13db/0x2240 [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0 [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0 [<0000000056fedaf5>] do_syscall_64+0x35/0x80 [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/06615967d4889b08b19ff3dda96e8b131282f73d	Patch
https://git.kernel.org/stable/c/3e210891c4a4c2d858cd6f9f61d5809af251d4df	Patch
https://git.kernel.org/stable/c/42378a9ca55347102bbf86708776061d8fe3ece2	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc4::::::

History

07 May 2025, 13:21

Type	Values Removed	Values Added
CWE		CWE-401
First Time		Linux linux Kernel Linux
References	~~() https://git.kernel.org/stable/c/06615967d4889b08b19ff3dda96e8b131282f73d -~~	() https://git.kernel.org/stable/c/06615967d4889b08b19ff3dda96e8b131282f73d - Patch
References	~~() https://git.kernel.org/stable/c/3e210891c4a4c2d858cd6f9f61d5809af251d4df -~~	() https://git.kernel.org/stable/c/3e210891c4a4c2d858cd6f9f61d5809af251d4df - Patch
References	~~() https://git.kernel.org/stable/c/42378a9ca55347102bbf86708776061d8fe3ece2 -~~	() https://git.kernel.org/stable/c/42378a9ca55347102bbf86708776061d8fe3ece2 - Patch
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
CPE		cpe:2.3:o:linux:linux_kernel:6.1:rc4:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc1:::::: cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::

02 May 2025, 13:52

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, verificador: Se corrige una fuga de memoria en la reasignación de matriz para el estado de la pila. Si krealloc() devuelve un error (NULL), los usuarios de realloc_array() establecían sus punteros de asignación en NULL, pero en caso de error, krealloc() no modifica la asignación original. Esto provocaría una fuga de recursos de memoria. En su lugar, se libera la asignación anterior en la ruta de gestión de errores. La información de fuga de memoria es la siguiente, tal como lo informó Zhengchao: objeto sin referencia 0xffff888019801800 (tamaño 256): comm "bpf_repo", pid 6490, jiffies 4294959200 (edad 17.170s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0 [<0000000086712a0b>] krealloc+0x83/0xd0 [<00000000139aab02>] realloc_array+0x82/0xe2 [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186 [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341 [<0000000081780455>] do_check_common+0x5358/0xb350 [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d [<000000002973c690>] bpf_prog_load+0x13db/0x2240 [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0 [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0 [<0000000056fedaf5>] do_syscall_64+0x35/0x80 [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

01 May 2025, 15:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-05-01 15:16

Updated : 2025-05-07 13:21

NVD link : CVE-2022-49878

Mitre link : CVE-2022-49878

CVE.ORG link : CVE-2022-49878

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

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This would result in a memory\nresource leak. Instead, free the old allocation on the error handling\npath.\n\nThe memory leak information is as follows as also reported by Zhengchao:\n\n unreferenced object 0xffff888019801800 (size 256):\n comm \"bpf_repo\", pid 6490, jiffies 4294959200 (age 17.170s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0\n [<0000000086712a0b>] krealloc+0x83/0xd0\n [<00000000139aab02>] realloc_array+0x82/0xe2\n [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186\n [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341\n [<0000000081780455>] do_check_common+0x5358/0xb350\n [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d\n [<000000002973c690>] bpf_prog_load+0x13db/0x2240\n [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0\n [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0\n [<0000000056fedaf5>] do_syscall_64+0x35/0x80\n [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, verificador: Se corrige una fuga de memoria en la reasignaci\u00f3n de matriz para el estado de la pila. Si krealloc() devuelve un error (NULL), los usuarios de realloc_array() establec\u00edan sus punteros de asignaci\u00f3n en NULL, pero en caso de error, krealloc() no modifica la asignaci\u00f3n original. Esto provocar\u00eda una fuga de recursos de memoria. En su lugar, se libera la asignaci\u00f3n anterior en la ruta de gesti\u00f3n de errores. La informaci\u00f3n de fuga de memoria es la siguiente, tal como lo inform\u00f3 Zhengchao: objeto sin referencia 0xffff888019801800 (tama\u00f1o 256): comm \"bpf_repo\", pid 6490, jiffies 4294959200 (edad 17.170s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0 [<0000000086712a0b>] krealloc+0x83/0xd0 [<00000000139aab02>] realloc_array+0x82/0xe2 [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186 [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341 [<0000000081780455>] do_check_common+0x5358/0xb350 [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d [<000000002973c690>] bpf_prog_load+0x13db/0x2240 [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0 [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0 [<0000000056fedaf5>] do_syscall_64+0x35/0x80 [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd "}], "lastModified": "2025-05-07T13:21:23.850", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FB443DA9-A9E7-45CA-AAF4-AF14F567FE9F", "versionEndExcluding": "5.15.79", "versionStartIncluding": "5.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C3F26709-7D49-4AF0-8145-46CCF4E8E2AD", "versionEndExcluding": "6.0.9", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}

5.5 /10