Finding the Best Servers to Answer Queries -- Edge DNS and Anycast

TL;DR IP Anycast is a network addressing and routing methodology that allows IP addresses to be announced from multiple points on the internet With the proper implementation, Anycast can reduce DNS RTTs and offer innate DDoS protection Akamai's authoritative name service, Edge DNS, combines globa...

SUSE-SU-2021:0740-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 15 kernel was updated to receive various security and bugfixes. The following security bugs were fixed: - CVE-2021-26930: Fixed an improper error handling in blkback's grant mapping XSA-365 bsc1181843. - CVE-2021-26931: Fixed an issue where Linux kernel was treating gran...

DEBIAN-CVE-2021-28038

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations as a result of changes to the handling of grant mapping errors. A host OS denial of service may occur during...

UBUNTU-CVE-2021-28038

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations as a result of changes to the handling of grant mapping errors. A host OS denial of service may occur during...

Design/Logic Flaw

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations as a result of changes to the handling of grant mapping errors. A host OS denial of service may occur during...

CVE-2021-28038

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations as a result of changes to the handling of grant mapping errors. A host OS denial of service may occur during...

Updated kernel packages fix security vulnerabilities

This kernel update is based on upstream 5.10.19 and fixes at least the following security issues: An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An...

Linux: special config may crash when trying to map foreign pages

ISSUE DESCRIPTION With CONFIGXENBALLOONMEMORYHOTPLUG disabled and CONFIGXENUNPOPULATEDALLOC enabled the Linux kernel will use guest physical addresses allocated via the ZONEDEVICE functionality for mapping foreign guest's pages. This will result in problems, as the p2m list will only cover the...

Linux: netback fails to honor grant mapping errors

ISSUE DESCRIPTION XSA-362 tried to address issues here, but in the case of the netback driver the changes were insufficient: It left the relevant function invocation with, effectively, no error handling at all. As a result, memory allocation failures there could still lead to frontend-induced...

Fedora 33 : kernel (2021-7143aca8cb)

The remote Fedora 33 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-7143aca8cb advisory. - An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant...

An issue was discovered in the Linux kernel 3.2 through 5.10.16 as used by Xen. Grant mapping operations often occur in batch hypercalls where a number of operations are done in a single hypercall the success or failure of each one is reported to the backend driver and the backend driver then loops over the results performing follow-up actions based on the success or failure of each operation. Unfortunately when running in PV mode the Linux backend drivers mishandle this: Some errors are ignored effectively implying their success from the success of related batch elements. In other cases errors resulting from one batch element lead to further batch elements not being inspected and hence successful ones to not be possible to properly unmap upon error recovery. Only systems with Linux backends running in PV mode are vulnerable. Linux backends run in HVM / PVH modes are not vulnerable. This affects arch/*/xen/p2m.c and drivers/xen/gntdev.c.

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FreeBSD : FreeBSD -- Xen grant mapping error handling issues (5b8c6e1e-770f-11eb-b87a-901b0ef719ab)

Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on the success or failur...

FreeBSD-SA-21:06.xen

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-21:06.xen Security Advisory The FreeBSD Project Topic: Xen grant mapping error handling issues Category: contrib Module: xen Announced: 2021-02-24 Credits: See...

FreeBSD -- Xen grant mapping error handling issues

Problem Description: Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on...

NeDi PHP Code Injection Vulnerability

NeDi is an open source software tool that discovers, maps and inventories network devices and tracks connected end nodes. NeDi 1.9C suffers from a PHP code injection vulnerability. The vulnerability can be exploited to inject PHP code into the System Files function of endpoint /System-Files.php v...

Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9067)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9067 advisory. - xen-blkback: fix error handling in xenblkbkmap Jan Beulich Orabug: 32492110 CVE-2021-26930 - xen-scsiback: don't handle error by BUG Jan Beulich...

CVE-2021-26932

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then...

CVE-2021-26932

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then...

Design/Logic Flaw

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then...

UBUNTU-CVE-2021-26932

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then...