In the Linux kernel, the following vulnerability has been resolved:
ax25: Fix reference count leak issues of ax25_dev
The ax25_addr_ax25dev() and ax25_dev_device_down() exist a reference
count leak issue of the object “ax25_dev”.
Memory leak issue in ax25_addr_ax25dev():
The reference count of the object “ax25_dev” can be increased multiple
times in ax25_addr_ax25dev(). This will cause a memory leak.
Memory leak issues in ax25_dev_device_down():
The reference count of ax25_dev is set to 1 in ax25_dev_device_up() and
then increase the reference count when ax25_dev is added to ax25_dev_list.
As a result, the reference count of ax25_dev is 2. But when the device is
shutting down. The ax25_dev_device_down() drops the reference count once
or twice depending on if we goto unlock_put or not, which will cause
memory leak.
As for the issue of ax25_addr_ax25dev(), it is impossible for one pointer
to be on a list twice. So add a break in ax25_addr_ax25dev(). As for the
issue of ax25_dev_device_down(), increase the reference count of ax25_dev
once in ax25_dev_device_up() and decrease the reference count of ax25_dev
after it is removed from the ax25_dev_list.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ax25/ax25_dev.c"
],
"versions": [
{
"version": "d01ffb9eee4a",
"lessThan": "ae467750a376",
"status": "affected",
"versionType": "git"
},
{
"version": "d01ffb9eee4a",
"lessThan": "38eb01edfdaa",
"status": "affected",
"versionType": "git"
},
{
"version": "d01ffb9eee4a",
"lessThan": "81d8240b0a24",
"status": "affected",
"versionType": "git"
},
{
"version": "d01ffb9eee4a",
"lessThan": "1ea02699c755",
"status": "affected",
"versionType": "git"
},
{
"version": "d01ffb9eee4a",
"lessThan": "b505e0319852",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ax25/ax25_dev.c"
],
"versions": [
{
"version": "5.17",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.17",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.93",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.33",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8.12",
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.3",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/1ea02699c7557eeb35ccff2bd822de1b3e09d868
git.kernel.org/stable/c/38eb01edfdaa1562fa00429be2e33f45383b1b3a
git.kernel.org/stable/c/81d8240b0a243b3ddd8fa8aa172f1acc2f7cc8f3
git.kernel.org/stable/c/ae467750a3765dd1092eb29f58247950a2f9b60c
git.kernel.org/stable/c/b505e0319852b08a3a716b64620168eab21f4ced