Description
In the Linux kernel, the following vulnerability has been resolved:
chardev: fix error handling in cdev_device_add()
While doing fault injection test, I got the following report:
------------[ cut here ]------------ kobject: '(null)' (0000000039956980): is not initialized, yet kobject_put() is being called. WARNING: CPU: 3 PID: 6306 at kobject_put+0x23d/0x4e0 CPU: 3 PID: 6306 Comm: 283 Tainted: G W 6.1.0-rc2-00005-g307c1086d7c9 #1253 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:kobject_put+0x23d/0x4e0 Call Trace: <TASK> cdev_device_add+0x15e/0x1b0 __iio_device_register+0x13b4/0x1af0 [industrialio] __devm_iio_device_register+0x22/0x90 [industrialio] max517_probe+0x3d8/0x6b4 [max517] i2c_device_probe+0xa81/0xc00
When device_add() is injected fault and returns error, if dev->devt is not set, cdev_add() is not called, cdev_del() is not needed. Fix this by checking dev->devt in error path.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= da97a80a657d1b1b50ef633e8ff5dbf0d417fc8d, < 5d2146889fad4cb9e6c13e790d4cfd871486eca8; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < 6acf8597c5b04f455ee0649e11e5f3bcd28f381e; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < 34d17b39bceef25e4cf9805cd59250ae05d0a139; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < d85b5247a79355b8432bfd9ac871f96117f750d4; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < c46db6088bccff5115674d583fef46ede80077a2; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < 28dc61cc49c6e995121c6d86bef4b73df78dda80; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < b5de1eac71fec1af7723f1083d23a24789fd795c; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < 85a5660491b507d33662b8e81c142e6041e642eb; >= 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0, < 11fa7fefe3d8fac7da56bc9aa3dd5fb3081ca797; f78b54e7d83c7879f9a6e49e6724019ca34177cc; d79d7d5c878809964da537336dad5ff55fa1605e; >= 4.9.224, < 4.9.337; >= 3.16.83, < 3.17; >= 4.4.224, < 4.5 |
| Linux | Linux | 4.12 |
References
- https://git.kernel.org/stable/c/11fa7fefe3d8fac7da56bc9aa3dd5fb3081ca797Patch
- https://git.kernel.org/stable/c/28dc61cc49c6e995121c6d86bef4b73df78dda80Patch
- https://git.kernel.org/stable/c/34d17b39bceef25e4cf9805cd59250ae05d0a139Patch
- https://git.kernel.org/stable/c/5d2146889fad4cb9e6c13e790d4cfd871486eca8Patch
- https://git.kernel.org/stable/c/6acf8597c5b04f455ee0649e11e5f3bcd28f381ePatch
- https://git.kernel.org/stable/c/85a5660491b507d33662b8e81c142e6041e642ebPatch
- https://git.kernel.org/stable/c/b5de1eac71fec1af7723f1083d23a24789fd795cPatch
- https://git.kernel.org/stable/c/c46db6088bccff5115674d583fef46ede80077a2Patch
- https://git.kernel.org/stable/c/d85b5247a79355b8432bfd9ac871f96117f750d4Patch
Timeline
- Published
- Sep 15, 2025
- Last modified
- Nov 5, 2026
- NVD status
- Analyzed