Ubuntu.comUB:CVE-2021-47416CVE-2021-47416
In the Linux kernel, the following vulnerability has been resolved: phy:
mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface,
the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states:
- Bus is only allocated 2. Bus allocated and __mdiobus_register() fails,
but device_register() was called In case of device_register() has been
called we should call put_device() to correctly free the memory allocated
for this device, but mdiobus_free() calls just kfree(dev) in case of
MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state
to MDIOBUS_UNREGISTERED before calling device_register(), because
put_device() should be called even in case of device_register() failure.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws-hwe | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-azure | < any | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-azure | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
References
git.kernel.org/linus/ca6e11c337daf7925ff8a2aac8e84490a8691905 (5.15-rc5)
git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d
git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a
git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7
git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f
git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639
git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988
git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905
git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6
launchpad.net/bugs/cve/CVE-2021-47416
nvd.nist.gov/vuln/detail/CVE-2021-47416
security-tracker.debian.org/tracker/CVE-2021-47416
www.cve.org/CVERecord?id=CVE-2021-47416
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