CVE-2021-47668
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: dev: can_restart: fix use after free bug
After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len;
Reordering the lines solves the issue.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 92668d28c7e6a7a2ba07df287669ffcdf650c421 | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 08ab951787098ae0b6c0364aeea7a8138226f234 | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < ac48ef15826e83f4206c47add61072e8fc76d328 | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 593c072b7b3c4d7044416eb039d9ad706bedd67a | affected |
| Linux | Linux | 39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 03f16c5075b22c8902d2af739969e878b0879c94 | affected |
| Linux | Linux | 2.6.31 | affected |
| Linux | Linux | 0 < 2.6.31 | unaffected |
| Linux | Linux | 4.4.254 <= 4.4.* | unaffected |
| Linux | Linux | 4.9.254 <= 4.9.* | unaffected |
| Linux | Linux | 4.14.218 <= 4.14.* | unaffected |
| Linux | Linux | 4.19.171 <= 4.19.* | unaffected |
| Linux | Linux | 5.4.93 <= 5.4.* | unaffected |
| Linux | Linux | 5.10.11 <= 5.10.* | unaffected |
| Linux | Linux | 5.11 <= * | unaffected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
- https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8
- https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282
- https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421
- https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234
- https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328
- https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a
- https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94
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