PT-2017-1932 · Linux+1 · Linux Kernel+1
Fabian Grünbichler
·
Published
2017-04-18
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Updated
2017-06-07
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CVE-2017-7979
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions 4.11.x through 4.11-rc7
Description
The cookie feature in the packet action API implementation mishandles the tb nlattr array, allowing local users to cause a denial of service, such as uninitialized memory access and refcount underflow, which can lead to system hang or crash. This issue can be exploited via "tc filter add" commands in certain contexts.
Recommendations
For Linux kernel versions 4.11.x through 4.11-rc7, consider restricting access to the "tc filter add" command to minimize the risk of exploitation until a patch is available.
As a temporary workaround, avoid using the "tc filter add" command in sensitive contexts until the issue is resolved.
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
DoS
RCE
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Ubuntu