Riskcovery

CVE-2021-47459

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv

State
Published
Severity
7.8 High
Published
May 22, 2024
Updated
Aug 5, 2026
Reserved
May 22, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 9d71dd0c70099914fcd063135da3c580865e924c to before a0e47d2833b4f65e6c799f28c6b636d36b8b936dAffected
  • 9d71dd0c70099914fcd063135da3c580865e924c to before 864e77771a24c877aaf53aee019f78619cbcd668Affected
  • 9d71dd0c70099914fcd063135da3c580865e924c to before 6e8811707e2df0c6ba920f0cad3a3bca7b42132fAffected
  • 9d71dd0c70099914fcd063135da3c580865e924c to before d9d52a3ebd284882f5562c88e55991add5d01586Affected
LinuxLinux
  • 5.4Affected
  • before 5.4Not affected
  • 5.4.156 through 5.4.*Not affected
  • 5.10.76 through 5.10.*Not affected
  • 5.14.15 through 5.14.*Not affected
  • 5.15 and laterNot affected

References

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