CVE-2024-36244: net/sched: taprio: extend minimum interval restriction to entire cycle too
First published: Fri Jun 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: extend minimum interval restriction to entire cycle too It is possible for syzbot to side-step the restriction imposed by the blamed commit in the Fixes: tag, because the taprio UAPI permits a cycle-time different from (and potentially shorter than) the sum of entry intervals. We need one more restriction, which is that the cycle time itself must be larger than N * ETH_ZLEN bit times, where N is the number of schedule entries. This restriction needs to apply regardless of whether the cycle time came from the user or was the implicit, auto-calculated value, so we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)" branch. This way covers both conditions and scenarios. Add a selftest which illustrates the issue triggered by syzbot.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.9.4 | 6.9.4 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1 | 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724
- https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2
- https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3
- https://launchpad.net/bugs/cve/CVE-2024-36244
- https://access.redhat.com/security/cve/CVE-2024-36244
- https://lore.kernel.org/linux-cve-announce/2024062134-CVE-2024-36244-f88f@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:8158
- https://access.redhat.com/errata/RHSA-2024:8157
- https://access.redhat.com/errata/RHSA-2024:8617
- https://bugzilla.redhat.com/show_bug.cgi?id=2293654
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36244
- https://nvd.nist.gov/vuln/detail/CVE-2024-36244
- https://security-tracker.debian.org/tracker/CVE-2024-36244
- https://ubuntu.com/security/CVE-2024-36244
- https://git.kernel.org/linus/fb66df20a7201e60f2b13d7f95d031b31a8831d3
- https://git.kernel.org/stable/c/34d83c3e6e97867ae061d14eb52123404aab1cbc
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