Linux Kernel up to 5.10.102/5.15.25/5.16.11 bpf generic_map_delete_batch infinite loop

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.10.102/5.15.25/5.16.11. This affects the function generic_map_delete_batch of the component bpf. This manipulation causes infinite loop. This vulnerability appears as CVE-2022-48939. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.10.102/5.15.25/5.16.11 and classified as critical. Affected by this vulnerability is the function generic_map_delete_batch of the component bpf. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bpf: Add schedule points in batch ops syzbot reported various soft lockups caused by bpf batch operations. INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier Nothing prevents batch ops to process huge amount of data, we need to add schedule points in them. Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop. This will be done later in -next tree once we get this fix merged, unless there is strong opinion doing this optimization sooner.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2022-48939 since 08/22/2024. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 212625 (EulerOS 2.0 SP12 : kernel (EulerOS-SA-2024-2953)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.103, 5.15.26 or 5.16.12 eliminates this vulnerability. Applying the patch 7ef94bfb08fb/8628f489b749/7e8099967d0e/75134f16e7dd is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (212625). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.102
• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
• 5.15.10
• 5.15.11
• 5.15.12
• 5.15.13
• 5.15.14
• 5.15.15
• 5.15.16
• 5.15.17
• 5.15.18
• 5.15.19
• 5.15.20
• 5.15.21
• 5.15.22
• 5.15.23
• 5.15.24
• 5.15.25
• 5.16.0
• 5.16.1
• 5.16.2
• 5.16.3
• 5.16.4
• 5.16.5
• 5.16.6
• 5.16.7
• 5.16.8
• 5.16.9
• 5.16.10
• 5.16.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

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