CVE-2024-36244
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…
Does this matter?
Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/34d83c3e6e97867ae061d14eb52123404aab1cbcPatch
- https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724Patch
- https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2Patch
- https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3Patch
- https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724Patch
- https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2Patch
- https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.