Container-Optimized OS Release Notes: DEV

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September 08, 2026

Change

cos-dev-138-20098-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.49 v29.4.3 v2.3.2 See List
Change

Updated the Linux kernel to v6.18.48.

Change

Updated the Linux kernel to v6.18.49.

Fixed

Updated sys-devel/binutils to v2.40.

Security

Update dev-go/net to v0.55.0 to fix CVE-2026-25680.

August 31, 2026

Change

cos-dev-138-20085-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.46 v29.4.3 v2.3.2 See List
Change

Updated cos-gpu-installer to v2.7.7.

Change

Updated the Linux kernel to v6.18.46.

Fixed

Added support for net-fs/lustre-client-drivers v2.14.0_p259.

Fixed

Updated cos-gpu-installer to v2.7.6.

Fixed

Updated net-misc/openssh to version 10.4_p1.

Fixed

Upgraded app-admin/google-guest-configs to v20260819.00.

Fixed

Upgraded app-admin/oslogin to v20260814.00.

Fixed

Upgraded app-arch/zstd to v1.5.7-r1.

Fixed

Upgraded app-containers/docker-credential-helpers to v0.9.9.

Fixed

Upgraded app-shells/dash to v0.5.13.5.

Fixed

Upgraded chromeos-base/chromeos-dbus-bindings to v0.0.1-r2802.

Fixed

Upgraded chromeos-base/power_manager-client to v0.0.1-r2975.

Fixed

Upgraded chromeos-base/session_manager-client to v0.0.1-r2837.

Fixed

Upgraded dev-db/sqlite to v3.53.4.

Fixed

Upgraded dev-lang/luajit to v2.1.1780076327.

Fixed

Upgraded dev-libs/expat to v2.8.3.

Fixed

Upgraded dev-libs/gmp to v6.3.0-r2.

Fixed

Upgraded dev-libs/inih to v62.

Fixed

Upgraded dev-libs/libaio to v0.3.113_p8.

Fixed

Upgraded dev-libs/libgpg-error to v1.61.

Fixed

Upgraded dev-libs/libltdl to v2.5.4.

Fixed

Upgraded dev-libs/libpcre2 to v10.47.

Fixed

Upgraded dev-libs/libverto to v0.3.2-r1.

Fixed

Upgraded dev-libs/popt to v1.19-r1.

Fixed

Upgraded dev-libs/userspace-rcu to v0.15.6.

Fixed

Upgraded dev-python/oauthlib to v3.3.1.

Fixed

Upgraded net-dns/c-ares to v1.34.8.

Fixed

Upgraded net-libs/nghttp2 to v1.70.0.

Fixed

Upgraded sys-apps/acl to v2.4.0-r2.

Fixed

Upgraded sys-apps/ethtool to v7.0.

Fixed

Upgraded sys-apps/pciutils to v3.15.0.

Fixed

Upgraded sys-apps/xemu to v0.0.10.

Fixed

Upgraded sys-auth/passwdqc to v2.1.0-r1.

Fixed

Upgraded sys-libs/libcap-ng to v0.9.5-r1.

Fixed

Upgraded sys-process/lsof to v4.99.7.

Security

Upgraded dev-libs/libxml2 to v2.15.3. This fixes CVE-2026-0989, CVE-2026-0990, and CVE-2026-0992.

Security

Upgraded vim & vim-core to version 9.2.0280. This fixes CVE-2026-35177.

August 11, 2026

Change

cos-dev-138-20035-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.41 v29.4.3 v2.3.2 See List
Feature

Added support for installing the Vast 4.5.8 NFS client drivers with cos-dkms.

Fixed

Added kernel patch to reduce bcache garbage collection sleep interval to prevent I/O stalls.

Fixed

Mask nfttables-restore.service to address time to ssh regression.

Fixed

Updated app-admin/node-problem-detector to v0.8.25.

Security

Fixed KCTF-8173f7e in the Linux Kernel.

Security

Upgraded net-libs/nghttp2 to 1.69.0 and fixed CVE-2026-58055.

August 04, 2026

Change

cos-dev-138-20012-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.41 v29.4.3 v2.3.2 See List
Change

Added a splash screen which is displayed at login.

Change

Added support for net-fs/lustre-client-drivers v2.14.0_p256.

Change

Added support for the swiotlb=any kernel command line parameter.

Change

Updated google-guest-configs to v20260121.00.

Change

Updated the Linux kernel to v6.18.41.

Change

cchost: Add bpf-lsm-policy for VM restrictions.

Change

cchost: Increased the size of the kernel partitions from 16 MiB to 32 MiB.

Feature

Added TPUDirect support.

Feature

Added support for zswap in the Linux kernel.

Feature

Enabled CONFIG_MEMORY_FAILURE in the Linux kernel for ARM64. This should improve memory errors handling when running CUDA workloads.

Fixed

Added support for NVIDIA GRID driver version 580.159.03.

Fixed

Changed google-guest-agent's plugin installation path to /var/lib/google/guest-agent.

Fixed

Update udev rule for protected_stateful_partition

Security

Updated containerd to v2.3.2., containerd-test to v2.3.2.. This resolves CVE-2026-46680, CVE-2026-50195, CVE-2026-53488, CVE-2026-53492.

Fixed

Updated dev-cpp/abseil-cpp to v20230802.0; dev-libs/flatbuffersto v24.3.25; sys-devel/autofdo to v0.30-r12; media-libs/cros-camera-hal-fake to v0.0.1-r616; chromeos-base/chromeos-dbus-bindings to v0.0.1-r2800; chromeos-base/chromeos-installer to v0.1.0-r4432; chromeos-base/hardware_verifier_proto to v0.0.1-r819; chromeos-base/imageloader to v0.0.1-r2064; chromeos-base/libbrillo to v0.0.1-r2547; chromeos-base/libchrome to v0.0.1-r1242; chromeos-base/libhwsec-foundation to v0.0.1-r826; chromeos-base/libstorage to v0.0.1-r162; chromeos-base/metrics to v0.0.2-r3890; chromeos-base/perfetto to v48.1-r69; chromeos-base/quipper to v0.0.1-r3050; chromeos-base/system_api to v0.0.1-r5972; chromeos-base/update_engine to v0.0.3-r5184; chromeos-base/vboot_reference to v1.0-r2986;dev-rust/vboot_reference-sys to v1.0.0-r36; chromeos-base/verity to v0.0.1-r583; chromeos-base/vpd to v0.0.1-r339; Removed packages dev-util/bazel,dev-util/iwyu, and dev-util/cvise; Removed chromeos-base/crash-reporter.

Fixed

Updated dev-lang/rust, dev-lang/rust-host, dev-lang/rust-bootstrap to v1.84.1; dev-rust/protobuf-codegen to v2.28.0; dev-rust/system_api to v0.24.53-r1596; dev-rust/third-party-crates-src to v0.0.1-r288.

Fixed

Updated dev-libs/isa-l to v2.32.1.

Fixed

Updated sys-devel/gdb to v15.1; sys-apps/flashrom to v0.9.9-r1758; dev-python/cryptography to v43.0.3; Update dev-python/pyopenssl to v24.2.1.

Fixed

Updated sys-devel/llvm to v20.0_pre547379; sys-libs/compiler-rt to v20.0_pre547379; sys-libs/libcxx to v20.0_pre547379; sys-libs/llvm-libunwind to v20.0_pre547379.

Fixed

Upgrade Kubernetes to 1.36.1

Fixed

Upgraded app-admin/oslogin to v20260626.00.

Fixed

Upgraded app-crypt/sbsigntools to v0.42.0, and net-misc/m2crypto to v0.42.0.

Fixed

Upgraded chromeos-base/debugd-client to v0.0.1-r2739.

Fixed

Upgraded dev-db/sqlite to v3.53.3.

Fixed

Upgraded dev-libs/expat to v2.8.2.

Fixed

Upgraded dev-libs/openssl from v3.5.6 to v4.0.0.

Fixed

Upgraded net-misc/chrony to v4.8-r2.

Fixed

Upgraded net-misc/curl to 8.21.0.

Fixed

Upgraded net-misc/socat to v1.8.1.3.

Fixed

Upgraded sys-apps/acl to v2.4.0.

Fixed

Upgraded sys-apps/attr to v2.6.0.

Security

Fixed CVE-2026-29111 in sys-apps/systemd

Security

Fixed CVE-2026-39827, CVE-2026-39828, CVE-2026-39829, CVE-2026-39830, CVE-2026-39831, CVE-2026-39832, CVE-2026-39833, CVE-2026-39834, CVE-2026-39835, CVE-2026-42508, CVE-2026-46595, CVE-2026-46597, and CVE-2026-46598 in dev-go/crypto.

Security

Fixed CVE-2026-40225 in sys-apps/systemd.

Security

Fixed CVE-2026-40355 and CVE-2026-40356 in app-crypt/mit-krb5.

Security

Fixed CVE-2026-58469, CVE-2026-58471, CVE-2026-58472 in net-misc/wget.

Security

Fixed CVE-2026-58470 in net-misc/wget.

Security

Fixed CVE-2026-59890 in dev-python/setuptools.

Security

Updated glib and gdbus-codegen to v2.89.1. This resolves CVE-2026-58013,CVE-2026-58014,CVE-2026-58015,CVE-2026-58016.

Security

Upgraded net-misc/openssh to version 10.3_p1. This resolves CVE-2026-35387 and CVE-2026-35388.

Change

Runtime sysctl changes:

  • Changed: fs.epoll.max_user_watches: 1808094 -> 1807627
  • Changed: fs.fanotify.max_user_marks: 68395 -> 68378
  • Changed: fs.inotify.max_user_watches: 64173 -> 64158
  • Changed: kernel.threads-max: 63460 -> 63443
  • Changed: net.ipv4.tcp_mem: 93993 125327 187986 -> 93969 125295 187938
  • Changed: net.ipv4.udp_mem: 187989 250655 375978 -> 187941 250590 375882
  • Changed: user.max_cgroup_namespaces: 31730 -> 31721
  • Changed: user.max_fanotify_marks: 68395 -> 68378
  • Changed: user.max_inotify_watches: 64173 -> 64158
  • Changed: user.max_ipc_namespaces: 31730 -> 31721
  • Changed: user.max_mnt_namespaces: 31730 -> 31721
  • Changed: user.max_net_namespaces: 31730 -> 31721
  • Changed: user.max_pid_namespaces: 31730 -> 31721
  • Changed: user.max_time_namespaces: 31730 -> 31721
  • Changed: user.max_user_namespaces: 31730 -> 31721
  • Changed: user.max_uts_namespaces: 31730 -> 31721
  • Changed: vm.lowmem_reserve_ratio: 256 256 32 0 -> 256 256 32 0 0

June 29, 2026

Change

cos-dev-133-19907-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.36 v29.4.3 v2.2.3 See List
Change

Updated app-arch/gzip to v1.14_p20260502, app-arch/xz-utils to v5.4.7, app-arch/zstd to v1.5.7, app-crypt/mit-krb5 to v1.22.2, app-editors/vim and app-editors/vim-core to v9.1.2148, dev-libs/libaio to v0.3.113-r2, dev-libs/xxhash to v0.8.3, dev-python/PySocks to v1.6.8, dev-python/cryptography to v39.0.2, dev-python/markupsafe to v2.1.5, dev-python/pyrsistent to v0.14.11, dev-python/python-magic to v0.4.27, dev-python/pyyaml to v6.0.3, dev-python/rfc3339-validator to v0.1.4-r1, net-misc/rsync to v3.4.4, sys-apps/mawk to v1.3.4_p20260302, sys-libs/libxcrypt to v4.4.38, sys-libs/talloc to v2.4.4, sys-fs/lvm2 to v2.03.39, sys-libs/binutils-libs to v2.46.1.

Change

Updated app-containers/cloud-provider-gcp to v35.0.8, app-containers/docker-credential-gcr to v2.1.32, app-containers/nvidia-container-toolkit to v1.17.9, dev-libs/isa-l to v2.31.1, dev-python/oauthlib to v3.0.2, net-fs/nfs-utils to v2.6.4, sec-policy/apparmor-profiles, sys-apps/apparmor, and sys-libs/libapparmor to v3.1.7.

Change

Updated dev-libs/libtraceevent to v1.7.3, dev-libs/libtracefs to v1.6.4, net-firewall/conntrack-tools to v1.4.9, sys-fs/fuse to v2.9.9, sys-fs/fuse-common to v3.10.5.

Change

Updated sys-apps/casfs to v0.1.14.

Change

Updated the Linux kernel to v6.18.36.

Feature

Added support for loading the ublk kernel module.

Fixed

Upgraded app-admin/sosreport to v4.11.2.

Fixed

Upgraded app-containers/docker-credential-helpers to v0.9.8.

Fixed

Upgraded app-emulation/cloud-init to v26.1.

Fixed

Upgraded app-shells/dash to v0.5.13.4-r2.

Fixed

Upgraded chromeos-base/google-breakpad to v2026.06.22.165940-r278.

Fixed

Upgraded net-misc/curl to v8.20.0-r1.

Security

Fixed CVE-2026-40226 in sys-apps/systemd.

Security

Fixed CVE-2026-5928 in sys-libs/glibc.

Security

Fixed CVE-2026-6238 in sys-libs/glibc.

Security

Fixed CVE-2026-7210 in dev-lang/python.

Security

Upgraded dev-libs/openssl to v3.5.7 to fix CVE-2026-9076, CVE-2026-34183,CVE-2026-45445,CVE-2026-42764,CVE-2026-7383,CVE-2026-45447, CVE-2026-34182,CVE-2026-34181,CVE-2026-34180.

Change

Runtime sysctl changes:

  • Changed: kernel.threads-max: 63459 -> 63460
  • Changed: net.ipv4.udp_mem: 187989 250654 375978 -> 187989 250655 375978
  • Changed: user.max_cgroup_namespaces: 31729 -> 31730
  • Changed: user.max_ipc_namespaces: 31729 -> 31730
  • Changed: user.max_mnt_namespaces: 31729 -> 31730
  • Changed: user.max_net_namespaces: 31729 -> 31730
  • Changed: user.max_pid_namespaces: 31729 -> 31730
  • Changed: user.max_time_namespaces: 31729 -> 31730
  • Changed: user.max_user_namespaces: 31729 -> 31730
  • Changed: user.max_uts_namespaces: 31729 -> 31730

June 22, 2026

Change

cos-dev-133-19879-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.35 v29.4.3 v2.2.3 See List
Fixed

Upgraded app-admin/logrotate to v3.22.0-r1.

Fixed

Upgraded app-admin/oslogin to v20260605.00.

Fixed

Upgraded chromeos-base/google-breakpad to v2026.06.03.194714-r275.

Fixed

Upgraded cos-gpu-installer to v2.7.4.

Fixed

Upgraded dev-db/sqlite to v3.53.2-r1.

Fixed

Upgraded sys-apps/less to v704.

Security

Fixed CVE-2026-50195, CVE-2026-53488, CVE-2026-53492, CVE-2026-53489, and CVE-2026-47262 in app-containers/containerd.

June 15, 2026

Change

cos-dev-133-19862-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.35 v29.4.3 v2.2.3 See List
Change

Allow overriding IMA policy from oem partition.

Change

On cchost boards, autoload IMA policy on boot.

Change

Set static UUID for the stateful partition.

Change

Update sys-process/audit to v3.0.9.

Change

Updated glib to v2.86.5.

Change

Updated sys-libs/pam to v1.5.3.

Change

Updated the Linux kernel to v6.18.35.

Change

Upgraded net-misc/openssh to v10.0_p2.

Change

Upgraded sys-apps/ek-cpu-balloon to v1.2.3.

Fixed

Added support for NVIDIA driver v580.159.04.

Fixed

Fixed a crash that occurs when using the configfile or source GRUB2 commands when Secure Boot is enabled.

Fixed

Upgraded app-containers/docker to v29.4.3, Upgraded app-containers/docker-test to v29.4.3, Upgraded app-containers/docker-cli to v29.4.3.

Fixed

Upgraded app-containers/docker-credential-helpers to v0.9.7.

Fixed

Upgraded cos-gpu-installer to v2.7.2.

Fixed

Upgraded sys-apps/gentoo-functions to v1.7.7.

Fixed

Upgraded sys-apps/less to v702.

Fixed

Upgraded sys-libs/libcap-ng to v0.9.3.

Security

Fixed CVE-2026-44431 in dev-python/urllib3.

Security

Fixed CVE-2026-6732 in dev-libs/libxml2.

Security

Updated dev-lang/go to 1.25.10. This fixes CVE-2026-33814,CVE-2026-39819,CVE-2026-39823,CVE-2026-39825,CVE-2026-42499,CVE-2026-39817,CVE-2026-39820,CVE-2026-39826,CVE-2026-39836.

Security

Updated dev-python/pyjwt to v2.13.0. This fixes CVE-2026-48522, CVE-2026-48524, CVE-2026-48525, CVE-2026-485256.

Security

Updated net-misc/curl to v8.20. This fixes CVE-2026-5545,CVE-2026-4873,CVE-2026-6429,CVE-2026-7168,CVE-2026-6253,CVE-2026-6276,CVE-2026-7009,CVE-2026-5773.

May 21, 2026

Change

cos-dev-133-19804-0-0

Kernel Docker Containerd GPU Drivers
COS-6.18.32 v27.5.1 v2.2.3 See List
Change

Added support for the R595 Nvidia driver production branch.

Change

Apply hardening sysctls on cchost boards.

Change

Dropped support for the NVIDIA 535 drivers.

Change

Enabled mm hardening kernel cmdlines on cchost.

Change

Increased the size of the EFI partition from 32 MiB to 64 MiB and increased the sizes of both kernel partitions from 16 MiB to 32 MiB on x86.

Change

Made it so that /etc/machine-id is mounted with noexec, nosuid, and nodev.

Change

Switch cchost-* boards to legacy iptables.

Change

Updated the Linux kernel to v6.18.32.

Change

Updated uhaul to v6.18-0.

Change

Upgrade the Linux kernel to version 6.18.

Change

Upgraded sys-apps/xemu to v0.0.9.

Change

Upgraded sys-fs/cryptsetup to v2.8.6.

Change

Upgraded sysram to v6.18-0.

Feature

Added the cos_kernel_args tool that allows manipulating kernel command line arguments of a COS image.

Feature

Added nvidia-fs support to the COS GPU installer.

Fixed

Added support for NVIDIA driver v580.159.03.

Fixed

Added support for NVIDIA driver v595.71.05.

Fixed

Added support for NVIDIA drivers v580.126.16 and v580.126.20.

Fixed

Dropped support for NVIDIA MFT Tools v4.32.0.

Fixed

Upgraded CASFS to v0.1.3.

Fixed

Upgraded app-admin/oslogin to v20260227.00.

Fixed

Upgraded app-admin/oslogin to v20260430.00.

Fixed

Upgraded app-admin/sosreport to v4.11.1.

Fixed

Upgraded app-containers/docker-credential-helpers to v0.9.6.

Fixed

Upgraded app-shells/dash to v0.5.13.3.

Fixed

Upgraded app-shells/dash to v0.5.13.4.

Fixed

Upgraded chromeos-base/chromeos-common-script to v0.0.1-r672.

Fixed

Upgraded chromeos-base/debugd-client to v0.0.1-r2738.

Fixed

Upgraded chromeos-base/google-breakpad to v2026.04.24.230834-r272.

Fixed

Upgraded chromeos-base/google-breakpad to v2026.05.06.161957-r274.

Fixed

Upgraded chromeos-base/power_manager-client to v0.0.1-r2973.

Fixed

Upgraded chromeos-base/session_manager-client to v0.0.1-r2834.

Fixed

Upgraded cos-gpu-installer to v2.7.1.

Fixed

Upgraded dev-db/sqlite to v3.53.1.

Fixed

Upgraded dev-libs/expat to v2.8.0.

Fixed

Upgraded dev-libs/expat to v2.8.1.

Fixed

Upgraded net-libs/libnetfilter_queue to v1.0.5-r1.

Fixed

Upgraded net-misc/rsync to v3.4.2.

Fixed

Upgraded sys-apps/makedumpfile to v1.7.9.

Fixed

Upgraded sys-libs/libcap to v2.78.

Fixed

Upgraded sys-process/lsof to v4.99.6.

Fixed

Upgraded the dump capture kernel to Linux v6.18.

Security

Fixed CVE-2026-0994 in dev-libs/protobuf.

Security

Fixed CVE-2026-34743 in app-arch/xz-utils.

Security

Fixed CVE-2026-35385 and CVE-2026-35386 in net-misc/openssh.

Security

Fixed CVE-2026-35414 in net-misc/openssh.

Security

Fixed CVE-2026-4046 in sys-libs/glibc.

Security

Fixed CVE-2026-4437,CVE-2026-4438 in sys-libs/glibc.

Security

Fixed EFI variable OOB read in grub config parsing.

Security

Fixed argument injection in toolbox.

Security

Updated go to v1.25.9. This resolves CVE-2026-32280, CVE-2026-32281, CVE-2026-32283, CVE-2026-27140, CVE-2026-27144.

Security

Updated the Linux kernel to v6.18.31.

Security

Upgraded containerd to v2.2.3. This fixes CVE-2026-35469.

Security

Upgraded dev-libs/libgcrypt to v1.10.4 to fix CVE-2026-41989.

Security

Upgraded dev-libs/openssl to v3.5.6 to fix CVE-2026-28387, CVE-2026-28388, CVE-2026-28389, CVE-2026-28390, CVE-2026-31790.

Change

Runtime sysctl changes:

  • Added: dev.raid.sync_io_depth: 32
  • Added: fs.dentry-negative: 0
  • Added: fs.fanotify.watchdog_timeout: 0
  • Added: fs.fuse.default_request_timeout: 0