CVE-2022-49276

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49276
In the Linux kernel, the following vulnerability has been resolved: jffs2: fix memory leak in jffs2_scan_medium If an error is returned in jffs2_scan_eraseblock() and some memory has been added to the jffs2_summary *s, we can observe the following kmemleak report: -------------------------------------------- unreferenced object 0xffff88812b889c40 (size 64): comm "mount", pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): 40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00 @H........1...P. 00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08 ................ backtrace: [<ffffffffae93a3a3>] __kmalloc+0x613/0x910 [<ffffffffaf423b9c>] jffs2_sum_add_dirent_mem+0x5c/0xa0 [<ffffffffb0f3afa8>] jffs2_scan_medium.cold+0x36e5/0x4794 [<ffffffffb0f3dbe1>] jffs2_do_mount_fs.cold+0xa7/0x2267 [<ffffffffaf40acf3>] jffs2_do_fill_super+0x383/0xc30 [<ffffffffaf40c00a>] jffs2_fill_super+0x2ea/0x4c0 [<ffffffffb0315d64>] mtd_get_sb+0x254/0x400 [<ffffffffb0315f5f>] mtd_get_sb_by_nr+0x4f/0xd0 [<ffffffffb0316478>] get_tree_mtd+0x498/0x840 [<ffffffffaf40bd15>] jffs2_get_tree+0x25/0x30 [<ffffffffae9f358d>] vfs_get_tree+0x8d/0x2e0 [<ffffffffaea7a98f>] path_mount+0x50f/0x1e50 [<ffffffffaea7c3d7>] do_mount+0x107/0x130 [<ffffffffaea7c5c5>] __se_sys_mount+0x1c5/0x2f0 [<ffffffffaea7c917>] __x64_sys_mount+0xc7/0x160 [<ffffffffb10142f5>] do_syscall_64+0x45/0x70 unreferenced object 0xffff888114b54840 (size 32): comm "mount", pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00 .u.............. 00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5 ......D...kkkkk. backtrace: [<ffffffffae93be24>] kmem_cache_alloc_trace+0x584/0x880 [<ffffffffaf423b04>] jffs2_sum_add_inode_mem+0x54/0x90 [<ffffffffb0f3bd44>] jffs2_scan_medium.cold+0x4481/0x4794 [...] unreferenced object 0xffff888114b57280 (size 32): comm "mount", pid 692, jiffies 4294838393 (age 34.357s) hex dump (first 32 bytes): 10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00 ..l............. 00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5 ..8...(...kkkkk. backtrace: [<ffffffffae93be24>] kmem_cache_alloc_trace+0x584/0x880 [<ffffffffaf423c34>] jffs2_sum_add_xattr_mem+0x54/0x90 [<ffffffffb0f3a24f>] jffs2_scan_medium.cold+0x298c/0x4794 [...] unreferenced object 0xffff8881116cd510 (size 16): comm "mount", pid 692, jiffies 4294838395 (age 34.355s) hex dump (first 16 bytes): 00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5 ..........`...k. backtrace: [<ffffffffae93be24>] kmem_cache_alloc_trace+0x584/0x880 [<ffffffffaf423cc4>] jffs2_sum_add_xref_mem+0x54/0x90 [<ffffffffb0f3b2e3>] jffs2_scan_medium.cold+0x3a20/0x4794 [...] -------------------------------------------- Therefore, we should call jffs2_sum_reset_collected(s) on exit to release the memory added in s. In addition, a new tag "out_buf" is added to prevent the NULL pointer reference caused by s being NULL. (thanks to Zhang Yi for this analysis)

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/455f4a23490bfcbedc8e5c245c463a59b19e5ddd Patch
https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe Patch
https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a Patch
https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f Patch
https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c Patch
https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df Patch
https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16 Patch
https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6 Patch
https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

14 Apr 2025, 17:08

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jffs2: corregir pérdida de memoria en jffs2_scan_medium Si se devuelve un error en jffs2_scan_eraseblock() y se ha añadido algo de memoria a los *s de jffs2_summary, podemos observar el siguiente informe de kmemleak: -------------------------------------------- unreferenced object 0xffff88812b889c40 (size 64): comm "mount", pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): 40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00 @H........1...P. 00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08 ................ seguimiento inverso:[] __kmalloc+0x613/0x910 [] jffs2_sum_add_dirent_mem+0x5c/0xa0 [] jffs2_scan_medium.cold+0x36e5/0x4794 [] jffs2_do_mount_fs.cold+0xa7/0x2267 [] jffs2_do_fill_super+0x383/0xc30 [] jffs2_fill_super+0x2ea/0x4c0 [] mtd_get_sb+0x254/0x400 [] mtd_get_sb_by_nr+0x4f/0xd0 [] get_tree_mtd+0x498/0x840 [] jffs2_get_tree+0x25/0x30 [] vfs_get_tree+0x8d/0x2e0 [] path_mount+0x50f/0x1e50 [] do_mount+0x107/0x130 [] __se_sys_mount+0x1c5/0x2f0 [] __x64_sys_mount+0xc7/0x160 [] do_syscall_64+0x45/0x70 objeto sin referencia 0xffff888114b54840 (tamaño 32): comm "mount", pid 692, jiffies 4294838325 (antigüedad 34.288s) volcado hexadecimal (primeros 32 bytes): c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00 .u.............. 00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5 ......D...kkkkk. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_inode_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x4481/0x4794 [...] objeto sin referencia 0xffff888114b57280 (tamaño 32): comm "mount", pid 692, jiffies 4294838393 (edad 34.357s) volcado hexadecimal (primeros 32 bytes): 10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00 ..l............. 00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5 ..8...(...kkkkk. seguimiento inverso: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xattr_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x298c/0x4794 [...] objeto sin referencia 0xffff8881116cd510 (tamaño 16): comm "mount", pid 692, jiffies 4294838395 (edad 34.355s) volcado hexadecimal (primeros 16 bytes): 00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5 ..........`...k. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xref_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x3a20/0x4794 [...] -------------------------------------------- Por lo tanto, debemos llamar a jffs2_sum_reset_collected(s) al salir para liberar la memoria agregada en s. Además, se agrega una nueva etiqueta "out_buf" para evitar la referencia de puntero NULL causada por s que es NULL. (gracias a Zhang Yi por este análisis)
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-401
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/455f4a23490bfcbedc8e5c245c463a59b19e5ddd - () https://git.kernel.org/stable/c/455f4a23490bfcbedc8e5c245c463a59b19e5ddd - Patch
References () https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe - () https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe - Patch
References () https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a - () https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a - Patch
References () https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f - () https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f - Patch
References () https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c - () https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c - Patch
References () https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df - () https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df - Patch
References () https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16 - () https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16 - Patch
References () https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6 - () https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6 - Patch
References () https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33 - () https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33 - Patch

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-04-14 17:08

NVD link : CVE-2022-49276

Mitre link : CVE-2022-49276

CVE.ORG link : CVE-2022-49276

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime