CVE-2021-47459
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, ...)…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132fPatch
- https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668Patch
- https://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936dPatch
- https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586Patch
- https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132fPatch
- https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668Patch
- https://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936dPatch
- https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.