CVE-2021-47459
can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 87% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected 9d71dd0c70099914fcd063135da3c580865e924c – < a0e47d2833b4f65e6c799f28c6b636d36b8b936d
- affected 9d71dd0c70099914fcd063135da3c580865e924c – < 864e77771a24c877aaf53aee019f78619cbcd668
- affected 9d71dd0c70099914fcd063135da3c580865e924c – < 6e8811707e2df0c6ba920f0cad3a3bca7b42132f
- affected 9d71dd0c70099914fcd063135da3c580865e924c – < d9d52a3ebd284882f5562c88e55991add5d01586
- affected 5.4
- unaffected < 5.4
- unaffected 5.4.156 – ≤ 5.4.*
- unaffected 5.10.76 – ≤ 5.10.*
- unaffected 5.14.15 – ≤ 5.14.*
- unaffected 5.15 – ≤ *
References (4)
- https://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936d (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132f (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-47459)Record last updated .