In the Linux kernel, the following vulnerability has been resolved:
greybus: Fix use-after-free bug in gb_interface_release due to race condition.
In gb_interface_create, &intf->mode_switch_completion is bound with
gb_interface_mode_switch_work. Then it will be started by
gb_interface_request_mode_switch. Here is the relevant code.
if (!queue_work(system_long_wq, &intf->mode_switch_work)) {
…
}
If we call gb_interface_release to make cleanup, there may be an
unfinished work. This function will call kfree to free the object
“intf”. However, if gb_interface_mode_switch_work is scheduled to
run after kfree, it may cause use-after-free error as
gb_interface_mode_switch_work will use the object “intf”.
The possible execution flow that may lead to the issue is as follows:
CPU0 CPU1
| gb_interface_create
| gb_interface_request_mode_switch
gb_interface_release |
kfree(intf) (free) |
| gb_interface_mode_switch_work
| mutex_lock(&intf->mutex) (use)
Fix it by canceling the work before kfree.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "74cd0a421896",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "2b6bb0b4abfd",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "fb071f5c75d4",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "9a733d69a4a5",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "0b8fba38bdfb",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "03ea2b129344",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "5c9c5d7f26ac",
"versionType": "git"
}
],
"programFiles": [
"drivers/greybus/interface.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "unaffected",
"version": "5.4.279",
"versionType": "custom",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.221",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.162",
"versionType": "custom",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.95",
"versionType": "custom",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.35",
"versionType": "custom",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.9.6",
"versionType": "custom",
"lessThanOrEqual": "6.9.*"
},
{
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/greybus/interface.c"
],
"defaultStatus": "affected"
}
]
[
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
],
"vendor": "linux",
"product": "linux_kernel",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "74cd0a421896",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "2b6bb0b4abfd",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "fb071f5c75d4",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "9a733d69a4a5",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "0b8fba38bdfb",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "03ea2b129344",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "5c9c5d7f26ac",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
}
]
git.kernel.org/stable/c/03ea2b129344152157418929f06726989efc0445
git.kernel.org/stable/c/0b8fba38bdfb848fac52e71270b2aa3538c996ea
git.kernel.org/stable/c/2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83
git.kernel.org/stable/c/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce
git.kernel.org/stable/c/74cd0a421896b2e07eafe7da4275302bfecef201
git.kernel.org/stable/c/9a733d69a4a59c2d08620e6589d823c24be773dc
git.kernel.org/stable/c/fb071f5c75d4b1c177824de74ee75f9dd34123b9