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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-53624

net/sched: sch_fq: fix integer overflow of "credit"

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_fq: fix integer overflow of "credit" if sch_fq is configured with "initial quantum" having values greater than INT_MAX, the first assignment of "credit" does signed integer overflow to a very negative value. In this situation, the syzkaller script provided by Cristoph triggers the CPU soft-lockup warning even with few sockets. It's not an infinite loop, but "credit" wasn't probably meant to be minus 2Gb for each new flow. Capping "initial quantum" to INT_MAX proved to fix the issue. v2: validation of "initial quantum" is done in fq_policy, instead of open coding in fq_change() _ suggested by Jakub Kicinski

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < 4b8a05e3801661a0438fcd0cdef181030d966a5aaffected
  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < d0b43125ec892aeb1b03e5df5aab595097da225aaffected
  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < 4fbefeab88c6e79753a25099d455d3d59d2946b4affected
  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < 85f24cb2f10b2b0f2882e5786a09b4790bb3a0adaffected
  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < 2322462d6f9ad4874f4e3c63df3b5cc00cb1acbdaffected
  • afe4fd062416b158a8a8538b23adc1930a9b88dc to < 7041101ff6c3073fd8f2e99920f535b111c929cbaffected

Linux Linux

Default version status: affected

  • 3.12affected
  • 0 to < 3.12unaffected
  • 5.10.180 to ≤ 5.10.*unaffected
  • 5.15.111 to ≤ 5.15.*unaffected
  • 6.1.28 to ≤ 6.1.*unaffected
  • 6.2.15 to ≤ 6.2.*unaffected
  • 6.3.2 to ≤ 6.3.*unaffected
  • 6.4 to ≤ *unaffected

References