CVE-2022-49277: jffs2: fix memory leak in jffs2_do_mount_fs
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: jffs2: fix memory leak in jffs2_do_mount_fs If jffs2_build_filesystem() in jffs2_do_mount_fs() returns an error, we can observe the following kmemleak report: -------------------------------------------- unreferenced object 0xffff88811b25a640 (size 64): comm "mount", pid 691, jiffies 4294957728 (age 71.952s) 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: [<ffffffffa493be24>] kmem_cache_alloc_trace+0x584/0x880 [<ffffffffa5423a06>] jffs2_sum_init+0x86/0x130 [<ffffffffa5400e58>] jffs2_do_mount_fs+0x798/0xac0 [<ffffffffa540acf3>] jffs2_do_fill_super+0x383/0xc30 [<ffffffffa540c00a>] jffs2_fill_super+0x2ea/0x4c0 [...] unreferenced object 0xffff88812c760000 (size 65536): comm "mount", pid 691, jiffies 4294957728 (age 71.952s) hex dump (first 32 bytes): bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ backtrace: [<ffffffffa493a449>] __kmalloc+0x6b9/0x910 [<ffffffffa5423a57>] jffs2_sum_init+0xd7/0x130 [<ffffffffa5400e58>] jffs2_do_mount_fs+0x798/0xac0 [<ffffffffa540acf3>] jffs2_do_fill_super+0x383/0xc30 [<ffffffffa540c00a>] jffs2_fill_super+0x2ea/0x4c0 [...] -------------------------------------------- This is because the resources allocated in jffs2_sum_init() are not released. Call jffs2_sum_exit() to release these resources to solve the problem.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=2.6.15<4.9.311 | |
| Linux Kernel | >=4.10<4.14.276 | |
| Linux Kernel | >=4.15<4.19.238 | |
| Linux Kernel | >=4.20<5.4.189 | |
| Linux Kernel | >=5.5<5.10.110 | |
| Linux Kernel | >=5.11<5.15.33 | |
| Linux Kernel | >=5.16<5.16.19 | |
| Linux Kernel | >=5.17<5.17.2 |
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Reference Links
- https://git.kernel.org/stable/c/2a9d8184458562e6bf2f40d0e677fc85e2dd3834
- https://git.kernel.org/stable/c/9a0f6610c7daedd2eace430beeb08a8b7ac80699
- https://git.kernel.org/stable/c/dbe0d0521eaa6a3d235517319266c539bb5c5112
- https://git.kernel.org/stable/c/0978e9af4559a171ac7a74a1b3ef21804b0a0fa9
- https://git.kernel.org/stable/c/607d3aab7349f18e0d9dba4100d09d16fe27caca
- https://git.kernel.org/stable/c/4392e8aeebc5a4f8073620bccba7de1b1f6d7c88
- https://git.kernel.org/stable/c/5f34310d1376ca5b2ed798258def2c2ab3cc6699
- https://git.kernel.org/stable/c/c94128470e6fe53d9bd9d16d2d3271813f9d37af
- https://git.kernel.org/stable/c/d051cef784de4d54835f6b6836d98a8f6935772c
Frequently Asked Questions
What is the severity of CVE-2022-49277?
CVE-2022-49277 has a moderate severity level due to its potential impact on memory management in the Linux kernel.
How do I fix CVE-2022-49277?
To mitigate CVE-2022-49277, upgrade to a patched version of the Linux kernel that addresses the memory leak issue.
What versions of the Linux kernel are affected by CVE-2022-49277?
CVE-2022-49277 affects various versions of the Linux kernel, specifically those prior to the updated patches.
Can CVE-2022-49277 cause system crashes?
While CVE-2022-49277 primarily involves memory management, it may potentially lead to instability in certain situations.
Is CVE-2022-49277 specific to certain Linux distributions?
CVE-2022-49277 can affect any Linux distribution running the vulnerable versions of the Linux kernel, not limited to specific distributions.
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