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Vulnerability · Published Jul 12, 2024 · Assigned by Linux

CVE-2024-40909bpf: Fix a potential use-after-free in bpf_link_free()

High 7.8

In plain English

A high-severity security flaw 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 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 79.7% 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: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.9.7-1DEBIAN-CVE-2024-40909
Debian:14linux6.9.7-1DEBIAN-CVE-2024-40909
Ubuntu:24.04:LTSlinux6.8.0-44.44UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-aws6.8.0-1015.16UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1015.16~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-azure6.8.0-1014.16UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1014.16~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-gcp6.8.0-1014.16UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1014.16~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-gke6.8.0-1010.13UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-45.45~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-ibm6.8.0-1012.12UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-44.44.1UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-44.44.1~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1013.14UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1013.14~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1013.14.1UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1012.12UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-oracle6.8.0-1012.12UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1012.12~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-raspi6.8.0-1011.12UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-40909
Ubuntu:24.04:LTSlinux-riscv6.8.0-44.44.1UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-44.44.1~22.04.1UBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-40909
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-40909

Affected products (as reported)

VendorProductVersions
Linux Linux ac48dc6ac9240f73bf08d29edf65c2deca93ee5d – before e8ccda39b395169622855607085cdeef4d376e0f876941f533e7b47fc69977fc4551c02f2d18af97 – before 91cff53136daeff50816b0baeafd38a6976f62091a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce – before fa97b8fed9896f1e89cb657513e483a152d4c3821a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce – before 2884dc7d08d98a89d8d65121524bb7533183a63a5d8d447777564b35f67000e7838e7ccb64d525c86.6.26 – before 6.6.356.8.5 – before 6.9
Linux Linux 6.9

References