CVE-2024-26686

Summary

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

fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats

lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time.

Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4fe85bdaabd63f8f8579b24a10ed597c9c482164affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0c35d1914353799c54fa1843fe7dea6fcbcdbac5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4daffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3820b0fac7732a653bcc6f6ac20c1d72e697f8f6affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 27978243f165b44e342f28f449b91327944ea071affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7601df8031fd67310af891897ef6cc0df4209305affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.10.237 <= 5.10.*unaffected
LinuxLinux5.15.181 <= 5.15.*unaffected
LinuxLinux6.1.82 <= 6.1.*unaffected
LinuxLinux6.6.64 <= 6.6.*unaffected
LinuxLinux6.7.6 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References