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Bug 1640596 - (CVE-2018-18445) CVE-2018-18445 kernel: Faulty computation of numberic bounds in the BPF verifier
CVE-2018-18445 kernel: Faulty computation of numberic bounds in the BPF verifier
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20181005,repor...
: Security
Depends On: 1638044 1641387 1641388 1641389 1641390 1641391 1641392
Blocks: 1640597
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Reported: 2018-10-18 07:33 EDT by Andrej Nemec
Modified: 2018-10-24 14:23 EDT (History)
49 users (show)

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Doc Text:
A security flaw was found in the Linux kernel in the adjust_scalar_min_max_vals() function in kernel/bpf/verifier.c. A faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because this function mishandles 32-bit right shifts. This can lead to a system panic and a denial of service or other unspecified impact.
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Description Andrej Nemec 2018-10-18 07:33:58 EDT 
A security flaw was found in the Linux kernel in the adjust_scalar_min_max_vals() function in kernel/bpf/verifier.c. A faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because this function mishandles 32-bit right shifts. This can lead to a system panic and a denial of service or other unspecified impact.

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1686

https://seclists.org/oss-sec/2018/q4/69

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b799207e1e1816b09e7a5920fbb2d5fcf6edd681
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