In the Linux kernel, the following vulnerability has been resolved:
can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
It will trigger UAF for rx_kref of j1939_priv as following.
cpu0 cpu1
j1939_sk_bind(socket0, ndev0, …)
j1939_netdev_start
j1939_sk_bind(socket1, ndev0, …)
j1939_netdev_start
j1939_priv_set
j1939_priv_get_by_ndev_locked
j1939_jsk_add
…
j1939_netdev_stop
kref_put_lock(&priv->rx_kref, …)
kref_get(&priv->rx_kref, …)
REFCOUNT_WARN(“addition on 0;…”)
====================================================
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0
RIP: 0010:refcount_warn_saturate+0x169/0x1e0
Call Trace:
j1939_netdev_start+0x68b/0x920
j1939_sk_bind+0x426/0xeb0
? security_socket_bind+0x83/0xb0
The rx_kref’s kref_get() and kref_put() should use j1939_netdev_lock to
protect.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/can/j1939/main.c"
],
"versions": [
{
"version": "9d71dd0c7009",
"lessThan": "a0e47d2833b4",
"status": "affected",
"versionType": "git"
},
{
"version": "9d71dd0c7009",
"lessThan": "864e77771a24",
"status": "affected",
"versionType": "git"
},
{
"version": "9d71dd0c7009",
"lessThan": "6e8811707e2d",
"status": "affected",
"versionType": "git"
},
{
"version": "9d71dd0c7009",
"lessThan": "d9d52a3ebd28",
"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/can/j1939/main.c"
],
"versions": [
{
"version": "5.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.4",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.156",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.76",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.14.15",
"lessThanOrEqual": "5.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]