CVE-2021-47459

Advisory lineage Upstream: 0 Downstream: 10
Analyzed
Published: 22 May 2024, 06:23
Last modified:11 May 2026, 13:55

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 May 2024, 06:23
Published
Vulnerability first disclosed
11 May 2026, 13:55
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 7%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • linux•linux

    ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < a0e47d2833b4f65e6c799f28c6b636d36b8b936d | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 864e77771a24c877aaf53aee019f78619cbcd668 | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 6e8811707e2df0c6ba920f0cad3a3bca7b42132f | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < d9d52a3ebd284882f5562c88e55991add5d01586 | 5.4

  • linux•linux_kernel

    ≥ 5.4, < 5.4.156 | ≥ 5.5, < 5.10.76 | ≥ 5.11, < 5.14.15 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3 | 5.15:rc4 | 5.15:rc5 | 5.15:rc6

References (4)