CVE-2024-43889

Summary

In the Linux kernel, the following vulnerability has been resolved:

padata: Fix possible divide-by-0 panic in padata_mt_helper()

We are hit with a not easily reproducible divide-by-0 panic in padata.c at bootup time.

[ 10.017908] Oops: divide error: 0000 1 PREEMPT SMP NOPTI [ 10.017908] CPU: 26 PID: 2627 Comm: kworker/u1666:1 Not tainted 6.10.0-15.el10.x86_64 #1 [ 10.017908] Hardware name: Lenovo ThinkSystem SR950 [7X12CTO1WW]/[7X12CTO1WW], BIOS [PSE140J-2.30] 07/20/2021 [ 10.017908] Workqueue: events_unbound padata_mt_helper [ 10.017908] RIP: 0010:padata_mt_helper+0x39/0xb0 : [ 10.017963] Call Trace: [ 10.017968] <TASK> [ 10.018004] ? padata_mt_helper+0x39/0xb0 [ 10.018084] process_one_work+0x174/0x330 [ 10.018093] worker_thread+0x266/0x3a0 [ 10.018111] kthread+0xcf/0x100 [ 10.018124] ret_from_fork+0x31/0x50 [ 10.018138] ret_from_fork_asm+0x1a/0x30 [ 10.018147] </TASK>

Looking at the padata_mt_helper() function, the only way a divide-by-0 panic can happen is when ps->chunk_size is 0. The way that chunk_size is initialized in padata_do_multithreaded(), chunk_size can be 0 when the min_chunk in the passed-in padata_mt_job structure is 0.

Fix this divide-by-0 panic by making sure that chunk_size will be at least 1 no matter what the input parameters are.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < ab8b397d5997d8c37610252528edc54bebf9f6d3affected
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < 8f5ffd2af7274853ff91d6cd62541191d9fbd10daffected
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < a29cfcb848c31f22b4de6a531c3e1d68c9bfe09faffected
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < 924f788c906dccaca30acab86c7124371e1d6f2caffected
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < da0ffe84fcc1627a7dff82c80b823b94236af905affected
LinuxLinux004ed42638f4428e70ead59d170f3d17ff761a0f < 6d45e1c948a8b7ed6ceddb14319af69424db730caffected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.224 <= 5.10.*unaffected
LinuxLinux5.15.165 <= 5.15.*unaffected
LinuxLinux6.1.105 <= 6.1.*unaffected
LinuxLinux6.6.46 <= 6.6.*unaffected
LinuxLinux6.10.5 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References