CVE-2021-47293 (GCVE-0-2021-47293)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 07:08
VLAI?
Title
net/sched: act_skbmod: Skip non-Ethernet packets
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices: $ ip link add dev vcan0 type vcan $ ip link set up vcan0 $ tc qdisc add dev vcan0 root handle 1: htb $ tc filter add dev vcan0 parent 1: protocol ip prio 10 \ matchall action skbmod swap mac Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < e4fdca366806f6bab374d1a95e626a10a3854b0c (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < a88414fb1117f2fe65fb88e45ba694e1d09d5024 (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 071729150be9e1d1b851b70efb6d91ee9269d57b (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 727d6a8b7ef3d25080fad228b2c4a1d4da5999c6 (git)
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    Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.19.199 , ≤ 4.19.* (semver)
Unaffected: 5.4.136 , ≤ 5.4.* (semver)
Unaffected: 5.10.54 , ≤ 5.10.* (semver)
Unaffected: 5.13.6 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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