CVE-2021-47459 (GCVE-0-2021-47459)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:23 – Updated: 2025-05-04 07:11
VLAI?
Title
can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < a0e47d2833b4f65e6c799f28c6b636d36b8b936d (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 864e77771a24c877aaf53aee019f78619cbcd668 (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 6e8811707e2df0c6ba920f0cad3a3bca7b42132f (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < d9d52a3ebd284882f5562c88e55991add5d01586 (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.156 , ≤ 5.4.* (semver)
Unaffected: 5.10.76 , ≤ 5.10.* (semver)
Unaffected: 5.14.15 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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