XCP-ng 8.3 updates announcements and testing
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New security and maintenance update candidates for XCP-ng 8.3 LTS (kernel)
This release batch contains security fixes on the Linux kernel in dom0, version updates, some bug fixes and a few improvements.
What changed
Virtualization & System
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kernel: Update to 4.19.19-8.0.46.5- Fixes multiple vulnerabilities:
- CVE-2026-46300: A logic error in the network stack could allow an unprivileged local user to escalate its privileges to root by modifying page caches for file-backed files that were not supposed to be writable. The modifications are not persistent to a reboot (i.e. no disk corruption). This vulnerability is used by the public exploit
Fragnesia. - CVE-2026-46333: Incorrect tracking of users privilege level when a task is exiting in the ptrace sub-system could allow an unprivileged local user to escalate its privileges to root by writing to file descriptors they are not supposed to have access to. The changes made to potentially root-owned files are persisted across reboots. This vulnerability is used by the public exploits ssh-keysign-pwn as well as
ptrace_may_dream. - CVE-2026-43494: A double-free of pinned pages in the RDS kernel module in the transmit error path could allow an unprivileged local user to escalate its privileges to root by modifying page caches for file-backed files, allowing them to for example overwrite a SUID binary in page cache with a shellcode. Changes are not persistent across reboots. This vulnerability is used by the public exploit
pintheft.
- CVE-2026-46300: A logic error in the network stack could allow an unprivileged local user to escalate its privileges to root by modifying page caches for file-backed files that were not supposed to be writable. The modifications are not persistent to a reboot (i.e. no disk corruption). This vulnerability is used by the public exploit
- Fixes multiple vulnerabilities:
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qemu: Fix a potential issue in guest memory mapping lookup. -
edk2:- Fix issues while booting from physical CD/DVD drive.
- Bump UEFI guest vCPU limit to 128 vCPU (was 96 vCPUs)
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dmidecode: Update to 3.6-3- Version able to read type 42 tables (redfish)
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varstored: Update to 1.3.2-2.1- Sync with upstream.
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ipxe: PXE boot support of BIOS VMs on a VLAN with 802.1Q priority tags
Control plane
xapi: Enable USB passthrough of smartcards
Storage
blktap: No functional change. Only sync with upstream.
Network
openssh: Drop support of insecure clients- Old OpenSSH clients (version less than 7.2) can no longer connect with
ssh-rsa(due to SHA-1 being no longer accepted by the server). - The solution is either to update OpenSSH-clients (to a version >= 7.2), or to generate and use
ED25519keys.
- Old OpenSSH clients (version less than 7.2) can no longer connect with
Others
libtasn1: Update to 4.21.0 (hardening)fuse: Rebuildslang: Rebuildsystemtap: Rebuild
Optional packages
libreswan: Rebuildnetdata: Rebuild
Versions:
blktap: 3.55.5-6.7.xcpng8.3 -> 3.55.5-9.1.xcpng8.3dmidecode: 1:3.0-5.el7 -> 1:3.6-3.xcpng8.3edk2: 20220801-1.7.10.1.xcpng8.3 -> 20220801-1.7.11.1.xcpng8.3fuse: 2.9.2-10.xcpng8.3 -> 2.9.2-10.1.xcpng8.3ipxe: 20121005-1.0.7.xcpng8.3 -> 20121005-1.0.8.xcpng8.3kernel: 4.19.19-8.0.46.3.xcpng8.3 -> 4.19.19-8.0.46.5.xcpng8.3libreswam: 4.12-2.3.1.xcpng8.3 -> 4.12-2.3.2.xcpng8.3libtasn1: 4.10-1.el7 -> 4.21.0-1.xcpng8.3openssh: 9.8p1-1.2.3.xcpng8.3 -> 9.8p1-1.2.4.xcpng8.3netdata: 1.47.5-4.2.xcpng8.3 -> 1.47.5-4.3.xcpng8.3qemu: 2:4.2.1-5.2.17.1.xcpng8.3 -> 2:4.2.1-5.2.18.1.xcpng8.3slang: 2.3.2-11.xcpng8.3 -> 2.3.2-11.1.xcpng8.3systemtap: 4.0-5.2.xcpng8.3 -> 4.0-5.3.xcpng8.3varstored: 1.3.1-2.1.xcpng8.3 -> 1.3.2-2.1.xcpng8.3xapi: 26.1.4-3.1.xcpng8.3 -> 26.1.4-3.2.xcpng8.3
Test on XCP-ng 8.3
yum clean metadata --enablerepo=xcp-ng-testing,xcp-ng-candidates yum update --enablerepo=xcp-ng-testing,xcp-ng-candidates rebootThe usual update rules apply: pool coordinator first, etc.
What to test
As usual, normal use and anything else you want to test.
Test window before official release of the updates
~1 day
We would like to thank users who reported feedback since our last call for testing:
@Andrew, @acebmxer, @flakpyro, @greg_e, @jeffberntsen, @marcoi, @ovicz, @ph7, @probain.
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@rzr
nslookupis broken, but it was before this update too.nslookup vates.com 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: vates.com Address: 104.21.52.238 Name: vates.com Address: 172.67.205.118 openssl_link.c:132: INSIST(dst__memory_pool != ((void *)0)) failed, back trace #0 0x7fb705ab80e7 in ?? #1 0x7fb705ab803a in ?? #2 0x7fb7066c5780 in ?? #3 0x7fb704ed0df6 in ?? #4 0x7fb704f17464 in ?? #5 0x7fb704f17732 in ?? #6 0x7fb704f16b8d in ?? #7 0x7fb703681bd9 in ?? #8 0x7fb703681c27 in ?? #9 0x7fb70366a44c in ?? #10 0x405818 in ?? Aborted (core dumped) -
Updated both hosts at home with no issues. Will continue to test.
Dependency Installed: libtasn1-tools.x86_64 0:4.21.0-1.xcpng8.3 Updated: blktap.x86_64 0:3.55.5-9.1.xcpng8.3 dmidecode.x86_64 1:3.6-3.xcpng8.3 edk2.x86_64 0:20220801-1.7.11.1.xcpng8.3 forkexecd.x86_64 0:26.1.4-3.2.xcpng8.3 fuse-libs.x86_64 0:2.9.2-10.1.xcpng8.3 ipxe.noarch 0:20121005-1.0.8.xcpng8.3 kernel.x86_64 0:4.19.19-8.0.46.5.xcpng8.3 libtasn1.x86_64 0:4.21.0-1.xcpng8.3 libtasn1-devel.x86_64 0:4.21.0-1.xcpng8.3 message-switch.x86_64 0:26.1.4-3.2.xcpng8.3 openssh.x86_64 0:9.8p1-1.2.4.xcpng8.3 openssh-clients.x86_64 0:9.8p1-1.2.4.xcpng8.3 openssh-server.x86_64 0:9.8p1-1.2.4.xcpng8.3 qcow-stream-tool.x86_64 0:26.1.4-3.2.xcpng8.3 qemu.x86_64 2:4.2.1-5.2.18.1.xcpng8.3 rrdd-plugins.x86_64 0:26.1.4-3.2.xcpng8.3 slang.x86_64 0:2.3.2-11.1.xcpng8.3 sm-cli.x86_64 0:26.1.4-3.2.xcpng8.3 squeezed.x86_64 0:26.1.4-3.2.xcpng8.3 systemtap-runtime.x86_64 0:4.0-5.3.xcpng8.3 varstored.x86_64 0:1.3.2-2.1.xcpng8.3 varstored-guard.x86_64 0:26.1.4-3.2.xcpng8.3 varstored-tools.x86_64 0:1.3.2-2.1.xcpng8.3 vhd-tool.x86_64 0:26.1.4-3.2.xcpng8.3 wsproxy.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-core.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-nbd.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-rrd2csv.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-storage-script.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-tests.x86_64 0:26.1.4-3.2.xcpng8.3 xapi-xe.x86_64 0:26.1.4-3.2.xcpng8.3 xcp-networkd.x86_64 0:26.1.4-3.2.xcpng8.3 xcp-rrdd.x86_64 0:26.1.4-3.2.xcpng8.3 xenopsd.x86_64 0:26.1.4-3.2.xcpng8.3 xenopsd-cli.x86_64 0:26.1.4-3.2.xcpng8.3 xenopsd-xc.x86_64 0:26.1.4-3.2.xcpng8.3 -
Installed on my test systems and all seems to be working well so far.
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Thank you for this report, I fear this issue appeared when we rebuilt bind with openssl-3
nslookup vates.com 8.8.8.8
I confirm this issue, note that bind-utils is not installed by default, let me investigate.
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[09:43 xcp-ng-haznrrtw ~]# nslookup vates.com 8.8.8.8 -bash: nslookup: command not found[10:21 xcp-ng-haznrrtw ~]# yum install bind-utils -y Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Excluding mirror: updates.xcp-ng.org * xcp-ng-base: mirrors.xcp-ng.org Excluding mirror: updates.xcp-ng.org * xcp-ng-updates: mirrors.xcp-ng.org Resolving Dependencies --> Running transaction check ---> Package bind-utils.x86_64 32:9.9.4-63.1.xcpng8.3 will be installed --> Processing Dependency: bind-libs = 32:9.9.4-63.1.xcpng8.3 for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: libbind9.so.90()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: libdns.so.100()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: libisc.so.95()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: libisccc.so.90()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: libisccfg.so.90()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Processing Dependency: liblwres.so.90()(64bit) for package: 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 --> Running transaction check ---> Package bind-libs.x86_64 32:9.9.4-63.1.xcpng8.3 will be installed --> Finished Dependency Resolution Dependencies Resolved ========================================================================================================================================= Package Arch Version Repository Size ========================================================================================================================================= Installing: bind-utils x86_64 32:9.9.4-63.1.xcpng8.3 xcp-ng-updates 126 k Installing for dependencies: bind-libs x86_64 32:9.9.4-63.1.xcpng8.3 xcp-ng-updates 948 k Transaction Summary ========================================================================================================================================= Install 1 Package (+1 Dependent package) Total download size: 1.0 M Installed size: 3.0 M Downloading packages: (1/2): bind-libs-9.9.4-63.1.xcpng8.3.x86_64.rpm | 948 kB 00:00:00 (2/2): bind-utils-9.9.4-63.1.xcpng8.3.x86_64.rpm | 126 kB 00:00:01 ----------------------------------------------------------------------------------------------------------------------------------------- Total 855 kB/s | 1.0 MB 00:00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : 32:bind-libs-9.9.4-63.1.xcpng8.3.x86_64 1/2 Installing : 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 2/2 Verifying : 32:bind-libs-9.9.4-63.1.xcpng8.3.x86_64 1/2 Verifying : 32:bind-utils-9.9.4-63.1.xcpng8.3.x86_64 2/2 Installed: bind-utils.x86_64 32:9.9.4-63.1.xcpng8.3 Dependency Installed: bind-libs.x86_64 32:9.9.4-63.1.xcpng8.3 Complete! [10:22 xcp-ng-haznrrtw ~]# nslookup vates.com 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: vates.com Address: 172.67.205.118 Name: vates.com Address: 104.21.52.238 openssl_link.c:132: INSIST(dst__memory_pool != ((void *)0)) failed, back trace #0 0x7f419d8790e7 in ?? #1 0x7f419d87903a in ?? #2 0x7f419e486780 in ?? #3 0x7f419cc91df6 in ?? #4 0x7f419ccd8464 in ?? #5 0x7f419ccd8732 in ?? #6 0x7f419ccd7b8d in ?? #7 0x7f419b442bd9 in ?? #8 0x7f419b442c27 in ?? #9 0x7f419b42b44c in ?? #10 0x405818 in ?? Aborted (core dumpedEdit -No further issues to report at this time.
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Installed on my usual batch of test hosts, no issues so far.
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Hi,
I installed the update candidates within my test environment.
Updates installed fine, after reboot all looks good so far.
No apparent issues can be seen.
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Maybe this schould be under XO/Backup
Anyhow.ph7 said:
Ran the 2 updates released today and...
Back to only showing one VM inBackup/Restoreas it did a month or 2 ago.
Ran the replication job and all VMs showed up inBackup/Restoreagain. (XO5)It occurred again today, only showing 1 VM in restore
XOdaefc
Host updated 2 weeks ago.
After 1 scheduled CR job ran all VMs showed up again -
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In the back of my head I knew there was a thread and I found it
https://xcp-ng.org/forum/topic/12040/restore-only-showing-1-vm/21?_=1780396449511 -
@rzr
It seems to be working
edit: the update that is. -
@rzr Update installed and running on pools. Normal operations seem good. Had some issues with rolling pool reboot, but that happens a lot (unrelated to updates). An updated
bind-utilswould be nice, and any other SSL affected packages.
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