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CVE-2021-47459

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2024-4928-03
Posted Jul 31, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-4928-03 - An update for kernel is now available for Red Hat Enterprise Linux 9. Issues addressed include a null pointer vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2021-47459
SHA-256 | d85c1911157700d246f802349435694ee3fd873de2f76eb6b9c87f5544c9f2fe
Download | Favorite | View
Red Hat Security Advisory 2024-4831-03
Posted Jul 25, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-4831-03 - An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Extended Update Support.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2021-47459
SHA-256 | 4aacf55bed991ae5915163002d4c0931d77b4416499746b7ff222256d1ceda5b
Download | Favorite | View
Red Hat Security Advisory 2024-4823-03
Posted Jul 25, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-4823-03 - An update for kernel is now available for Red Hat Enterprise Linux 9.2 Extended Update Support. Issues addressed include denial of service, double free, and information leakage vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-47459
SHA-256 | bb2770371dedc5387519b73a580dddc764d46a102f08fa7e2a09adfa83d0b18c
Download | Favorite | View
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