5.5

CVE-2023-53624

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

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
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.12 < 5.10.180
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.111
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.28
Linux ≫ Linux Kernel Version >= 6.2 < 6.2.15
Linux ≫ Linux Kernel Version >= 6.3 < 6.3.2
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.19% 0.09
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

https://git.kernel.org/stable/c/4b8a05e3801661a0438fcd0cdef181030d966a5a
Patch
https://git.kernel.org/stable/c/d0b43125ec892aeb1b03e5df5aab595097da225a
Patch
https://git.kernel.org/stable/c/4fbefeab88c6e79753a25099d455d3d59d2946b4
Patch
https://git.kernel.org/stable/c/85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad
Patch
https://git.kernel.org/stable/c/2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd
Patch
https://git.kernel.org/stable/c/7041101ff6c3073fd8f2e99920f535b111c929cb
Patch