In the Linux kernel, the following vulnerability has been resolved:
tee: amdtee: fix use-after-free vulnerability in amdtee_close_session
There is a potential race condition in amdtee_close_session that may
cause use-after-free in amdtee_open_session. For instance, if a session
has refcount == 1, and one thread tries to free this session via:
kref_put(&sess->refcount, destroy_session);
the reference count will get decremented, and the next step would be to
call destroy_session(). However, if in another thread,
amdtee_open_session() is called before destroy_session() has completed
execution, alloc_session() may return ‘sess’ that will be freed up
later in destroy_session() leading to use-after-free in
amdtee_open_session.
To fix this issue, treat decrement of sess->refcount and removal of
‘sess’ from session list in destroy_session() as a critical section, so
that it is executed atomically.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/tee/amdtee/core.c"
],
"versions": [
{
"version": "757cc3e9ff1d",
"lessThan": "da7ce52a2f6c",
"status": "affected",
"versionType": "git"
},
{
"version": "757cc3e9ff1d",
"lessThan": "1680c82929bc",
"status": "affected",
"versionType": "git"
},
{
"version": "757cc3e9ff1d",
"lessThan": "60c3e7a00db9",
"status": "affected",
"versionType": "git"
},
{
"version": "757cc3e9ff1d",
"lessThan": "1c95574350cd",
"status": "affected",
"versionType": "git"
},
{
"version": "757cc3e9ff1d",
"lessThan": "f4384b3e54ea",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/tee/amdtee/core.c"
],
"versions": [
{
"version": "5.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.6",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.199",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.136",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.59",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.5.8",
"lessThanOrEqual": "6.5.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116
git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce
git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c
git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27
git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f