CVE-2021-47368
In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores a reference to the cpumask_t parameter in the irq descriptor, and that reference can be accessed later…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores a reference to the cpumask_t parameter in the irq descriptor, and that reference can be accessed later from irq_affinity_hint_proc_show(). Since the cpu_mask parameter passed to irq_set_affinity_hit() has only temporary storage (it's on the stack memory), later accesses to it are illegal. Thus reads from the corresponding procfs affinity_hint file can result in paging request oops. The issue is fixed by the get_cpu_mask() helper, which provides a permanent storage for the cpumask_t parameter.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.64% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28Patch
- https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bPatch
- https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Patch
- https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90Patch
- https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28Patch
- https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bPatch
- https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Patch
- https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.