CVE-2021-47520

can: pch_can: pch_can_rx_normal: fix use after free

HIGH

7.8

CVSS Score

Published: May 24, 2024 at 03:09 PM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

SSVC

No known 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.37 ≤ v < 4.14.2582.6.37 ≤ v < 4.19.2212.6.37 ≤ v < 4.4.2952.6.37 ≤ v < 4.9.2932.6.37 ≤ v < 5.10.852.6.37 ≤ v < 5.15.82.6.37 ≤ v < 5.162.6.37 ≤ v < 5.4.1654.10 ≤ v < 4.14.2584.15 ≤ v < 4.19.2214.20 ≤ v < 5.4.1654.5 ≤ v < 4.9.2935.11 ≤ v < 5.15.85.5 ≤ v < 5.10.852.6.37b21d18b51b31a24d17f883b678432fbdee3d5675

Vendor states this is fixed in 3a3c46e2eff0577454860a203be1a8295f4acb76 (fixed)

Vendor states this is fixed in 3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa (fixed)

Vendor states this is fixed in 6c73fc931658d8cbc8a1714b326cb31eb71d16a7 (fixed)

Vendor states this is fixed in 703dde112021c93d6e89443c070e7dbd4dea612e (fixed)

Vendor states this is fixed in 94cddf1e9227a171b27292509d59691819c458db (fixed)

Vendor states this is fixed in abb4eff3dcd2e583060082a18a8dbf31f02689d4 (fixed)

Vendor states this is fixed in affbad02bf80380a7403885b9fe4a1587d1bb4f3 (fixed)

Vendor states this is fixed in bafe343a885c70dddf358379cf0b2a1c07355d8d (fixed)

Vendor states this is fixed in 2.6.37 (unaffected)

Vendor states this is fixed in 4.14.258 (unaffected)

Vendor states this is fixed in 4.19.221 (unaffected)

Vendor states this is fixed in 4.4.295 (unaffected)