**Lenovo Security Advisory:** LEN-29592
**Potential Impact**: Denial of service, privilege escalation, information disclosure
**Severity:** High
**Scope of Impact:** Industry-wide
**CVE Identifier:** CVE-2013-4312, CVE-2013-7446, CVE-2014-3631, CVE-2014-5206, CVE-2014-5207, CVE-2014-6410, CVE-2014-7145, CVE-2014-7822, CVE-2014-7970, CVE-2014-7975, CVE-2014-8160, CVE-2014-8559, CVE-2014-8989, CVE-2014-9420, CVE-2014-9529, CVE-2014-9728, CVE-2014-9729, CVE-2014-9730, CVE-2015-1333, CVE-2015-1350, CVE-2015-1805, CVE-2015-2925, CVE-2015-3288, CVE-2015-3339, CVE-2015-3636, CVE-2015-4167, CVE-2015-5706, CVE-2015-7613, CVE-2015-8215, CVE-2015-8816, CVE-2015-8964, CVE-2016-0723, CVE-2016-0728, CVE-2016-0758, CVE-2016-0823, CVE-2016-10208, CVE-2016-2847, CVE-2016-3070, CVE-2016-3156, CVE-2016-4482, CVE-2016-5696, CVE-2016-6213, CVE-2016-6828, CVE-2016-7097, CVE-2016-7910, CVE-2016-7914, CVE-2016-7916, CVE-2016-8405, CVE-2016-8645, CVE-2016-9191, CVE-2017-1000253, CVE-2017-1000364, CVE-2017-13305, CVE-2017-14106, CVE-2017-15299, CVE-2017-16531, CVE-2017-16535, CVE-2017-17449, CVE-2017-17558, CVE-2017-17806, CVE-2017-18270, CVE-2017-2647, CVE-2017-2671, CVE-2017-5551, CVE-2017-5669, CVE-2017-5897, CVE-2017-7495, CVE-2017-7542, CVE-2017-7618, CVE-2017-8064, CVE-2017-9242, CVE-2018-1000026, CVE-2018-10087, CVE-2018-10124, CVE-2018-1066, CVE-2018-10876, CVE-2018-10877, CVE-2018-10880, CVE-2018-10881, CVE-2018-10882, CVE-2018-10883, CVE-2018-1092, CVE-2018-1093, CVE-2018-12896, CVE-2018-13053, CVE-2018-16884, CVE-2018-17972, CVE-2018-18281, CVE-2018-18344, CVE-2018-20169, CVE-2018-5344, CVE-2018-5953, CVE-2018-5995, CVE-2018-6927, CVE-2018-9422, CVE-2018-9568, CVE-2019-10638, CVE-2019-10639, CVE-2019-11190, CVE-2019-11477, CVE-2019-11478, CVE-2019-11479, CVE-2019-11599, CVE-2019-11833, CVE-2019-12819, CVE-2019-13272, CVE-2019-3901, CVE-2019-5489, CVE-2019-9213
**Summary Description: **
AMI has released AMI MegaRAC SP-X Baseboard Management Controller (BMC) security enhancements to address Linux kernel vulnerabilities.
**Mitigation Strategy for Customers (what you should do to protect yourself): **
Upgrade to the BMC firmware version (or newer) indicated for your model in the Product Impact section below.
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**Product Impact:**
To download the version specified for your product below, follow these steps:
1. Navigate to your product's Drivers & Software page by going to [https://support.lenovo.com/](<https://pcsupport.lenovo.com/us/en/>). PRC users should go to <https://newsupport.lenovo.com.cn/>
2. Search for your product by name or machine type.
3. Click Drivers & Software on the left menu panel.
4. Click on Manual Update to browse by Component type.
5. Compare the minimum fix version for your product from the applicable product table below with the latest version posted on the support site.
Alternatively and if applicable for your product, you may use Lenovo Vantage or Windows Update to update to the latest available version. To confirm you are using the minimum fix version (or higher), go to Add/Remove Programs and check the version listed there.
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The kernel handles the basic functions of the operating system:\n memory allocation, process allocation, device input and output, etc. Security Fix(es):An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP segments.\n If the Maximum Segment Size (MSS) of a TCP connection was set to low values, such as 48 bytes, it can leave as little as 8 bytes for the user data, which significantly increases the Linux kernel's resource (CPU, Memory, and Bandwidth) utilization. A remote attacker could use this flaw to cause a denial of service (DoS) by repeatedly sending network traffic on a TCP connection with low TCP MSS.(CVE-2019-11479)An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented, which leads to increased resource utilization to traverse and process these fragments as further SACK segments are received on the same TCP connection. A remote attacker could use this flaw to cause a denial of service (DoS) by sending a crafted sequence of SACK segments on a TCP connection.(CVE-2019-11478)An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS).(CVE-2019-11477)A flaw was found in the Linux kernel's implementation of ext4 extent management. The kernel doesn't correctly initialize memory regions in the extent tree block which may be exported to a local user to obtain sensitive information by reading empty/uninitialized data from the filesystem.(CVE-2019-11833)** DISPUTED ** An issue was discovered in drm_load_edid_firmware in drivers/gpu/drm/drm_edid_load.c in the Linux kernel through 5.1.5. 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AMI MegaRAC SP-X BMC Vulnerabilities - Lenovo Support US
