CVE-2024-44968

Summary

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

tick/broadcast: Move per CPU pointer access into the atomic section

The recent fix for making the take over of the broadcast timer more reliable retrieves a per CPU pointer in preemptible context.

This went unnoticed as compilers hoist the access into the non-preemptible region where the pointer is actually used. But of course it's valid that the compiler keeps it at the place where the code puts it which rightfully triggers:

BUG: using smp_processor_id() in preemptible [00000000] code: caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0

Move it to the actual usage site which is in a non-preemptible region.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdfe19aa91378972f10530635ad83b2d77f481044 < f54abf332a2bc0413cfa8bd6a8511f7aa99faea0affected
LinuxLinux457a1c87d454455d671a3045cf0b56157be110a1 < f91fb47ecacc178a83a77eeebd25cbaec18c01d6affected
LinuxLinux9ef7190228145f959d9bc0ddca40ecf76bb413b0 < 668c6c4a7e9e9f081c06b70f30104fb7013437edaffected
LinuxLinuxd3b165c10473aa6fc6141bb5b1f6e5b50c1fb774 < 541a900d245536d4809cb1aa322c3fcc2cdb58a6affected
LinuxLinux408bfb6b0a7f22e971ce6b600aec448769e580a8 < 7b3ec186ba93e333e9efe7254e7e31c1828e5d2daffected
LinuxLinux3a58c590f6bd1d20eb1e76c5cea31c36cc032339 < b9d604933d5fd72dd37f24e1dc35f778297d745aaffected
LinuxLinux2cdab4b4bf77369961f706cdeb7d040db10c5217 < 7dd12f85f150010ef7518201c63fa7e395f5c3e9affected
LinuxLinuxf7d43dd206e7e18c182f200e67a8db8c209907fa < 6881e75237a84093d0986f56223db3724619f26eaffected
LinuxLinux6.1.103 < 6.1.105affected
LinuxLinux6.6.44 < 6.6.46affected
LinuxLinux6.10.3 < 6.10.5affected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References