Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mtd: block2mtd: Fix divide error when erase_size is zero The erase size is parsed from the "block2mtd" module parameter and can be set to zero. add_device() then evaluates if (size % erase_size) with a zero divisor, which triggers a divide error: divide error: 0000 [#1] PREEMPT SMP PTI RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline] RIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459 Call Trace: block2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476 param_attr_store+0x214/0x310 kernel/params.c:589 module_attr_store+0x65/0x90 kernel/params.c:904 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 ... Reject a zero erase size before performing the modulo operation so the existing "erasesize must be a divisor of device size" error path reports the invalid argument and frees the device.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ea6d833a3fddcd1d60414d48f34c7f4fbe88608f before bff83b723e93acc788bd690dc4bc1f6f4356c35b; affected ea6d833a3fddcd1d60414d48f34c7f4fbe88608f before 826170a49ca1315af6b293a02200585b1e2186d9; affected ea6d833a3fddcd1d60414d48f34c7f4fbe88608f before a991c28066e7ba4da7450bb04478849f7ac6a14a; affected ea6d833a3fddcd1d60414d48f34c7f4fbe88608f before 21d0f05989bf0d5cef57b467a7fa4feefbd7236a; affected ea6d833a3fddcd1d60414d48f34c7f4fbe88608f before b5965c4221165045e19736794ca5f48ae3d67142 |
| Linux / Linux | affected 3.15; unaffected 0 before 3.15; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/bff83b723e93acc788bd690dc4bc1f6f4356c35b
- https://git.kernel.org/stable/c/826170a49ca1315af6b293a02200585b1e2186d9
- https://git.kernel.org/stable/c/a991c28066e7ba4da7450bb04478849f7ac6a14a
- https://git.kernel.org/stable/c/21d0f05989bf0d5cef57b467a7fa4feefbd7236a
- https://git.kernel.org/stable/c/b5965c4221165045e19736794ca5f48ae3d67142