# CVE-2022-49276: linux: In the Linux kernel, the following vulnerability has been resolved:  jffs2: fix memory leak in jffs2_scan_medium  If...

CVE-2022-49276 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49276, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49276
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49276](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49276.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49276](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49276.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49276](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49276.md) | Feb 26, 2025 |

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