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Ubuntu: (CVE-2021-47520): linux vulnerability

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Ubuntu: (CVE-2021-47520): linux vulnerability

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
05/24/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

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.

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-aws-hwe
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-4-15
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-4-15
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-hwe
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-ibm
  • ubuntu-upgrade-linux-ibm-5-4
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4

References

  • https://attackerkb.com/topics/cve-2021-47520
  • CVE - 2021-47520
  • https://git.kernel.org/linus/94cddf1e9227a171b27292509d59691819c458db
  • https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76
  • https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa
  • https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7
  • https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e
  • https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db
  • https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4
  • https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3
  • https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d
  • https://www.cve.org/CVERecord?id=CVE-2021-47520
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