CVE-2021-47520
In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). 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: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76Patch
- https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aaPatch
- https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7Patch
- https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612ePatch
- https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458dbPatch
- https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4Patch
- https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3Patch
- https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8dPatch
- https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76Patch
- https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aaPatch
- https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7Patch
- https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612ePatch
- https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458dbPatch
- https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4Patch
- https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3Patch
- https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.