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Vulnerability · Published May 22, 2024 · Assigned by Linux

CVE-2021-47456can: peak_pci: peak_pci_remove(): fix UAF

High 8.4

In plain English

A high-severity use-after-free in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.4High
Exploit odds (30 days)0.2%top 85.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-abi-stablelists4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-cross-headers4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-doc4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-headers4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-rt4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-core4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-core4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-kvm4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-devel4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-kvm4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-modules4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-tools4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-tools-libs4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8perf4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8python3-perf4.18.0-553.8.1.el8_10ALSA-2024:4211
Debian:12linux5.14.16-1DEBIAN-CVE-2021-47456
Debian:13linux5.14.16-1DEBIAN-CVE-2021-47456
Debian:14linux5.14.16-1DEBIAN-CVE-2021-47456
Rocky Linux:8kernel0:4.18.0-553.8.1.el8_10RLSA-2024:4211
Rocky Linux:8kernel-rt0:4.18.0-553.8.1.rt7.349.el8_10RLSA-2024:4352
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47456
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47456
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47456

Affected products (as reported)

VendorProductVersions
Linux Linux e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 1c616528ba4aeb1125a06b407572ab7b56acae38e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 447d44cd2f67a20b596ede3ca3cd67086dfd9ca9e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 34914971bb3244db4ce2be44e9438a9b30c56250e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before adbda14730aacce41c0d3596415aa39ad63eafd9e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 28f28e4bc3a5e0051faa963f10b778ab38c1db69e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 0e5afdc2315b0737edcf55bede4ee1640d2d464de6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd – before 949fe9b35570361bc6ee2652f89a0561b26eec98
Linux Linux 3.4

Weakness: CWE-416, CWE-467 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References