CVE-2025-30156

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg (CVE-2024-56633)
• kernel: KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop (CVE-2025-21839)
• kernel: block: fix resource leak in blk_register_queue() error path (CVE-2025-37980)
• kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc (CVE-2025-38015)
• kernel: espintcp: remove encap socket caching to avoid reference leak (CVE-2025-38097)
• kernel: bpf: fix ktls panic with sockmap (CVE-2025-38166)
• kernel: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem() (CVE-2025-38202)
• kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping (CVE-2025-38279)
• kernel: ring-buffer: Do not trigger WARN_ON() due to a commit_overrun (CVE-2025-38267)
• kernel: phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug (CVE-2025-38275)
• kernel: ftrace: Fix UAF when lookup kallsym after ftrace disabled (CVE-2025-38346)
• kernel: ACPICA: fix acpi operand cache leak in dswstate.c (CVE-2025-38345)
• kernel: nvmet: fix memory leak of bio integrity (CVE-2025-38405)
• kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() (CVE-2025-38441)
• kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime (CVE-2025-38470)
• kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() (CVE-2025-39866)
• kernel: PCI/AER: Avoid NULL pointer dereference in aer_ratelimit() (CVE-2025-40034)
• kernel: dm: fix NULL pointer dereference in __dm_suspend() (CVE-2025-40134)
• kernel: Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND" (CVE-2025-40210)
• kernel: Linux kernel MPTCP: Privilege escalation or denial of service via use-after-free in timer handling (CVE-2025-40257)
• kernel: smb: client: fix potential cfid UAF in smb2_query_info_compound (CVE-2025-40320)
• kernel: wifi: mac80211_hwsim: fix typo in frequency notification (CVE-2026-23040)
• kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check (CVE-2026-23111)
• kernel: Linux kernel: Denial of Service in ice driver due to race condition during VSI rebuild (CVE-2026-23210)
• kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: bonding: check xdp prog when set bond mode (CVE-2025-22105)
• kernel: block: fix resource leak in blk_register_queue() error path (CVE-2025-37980)
• kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc (CVE-2025-38015)
• kernel: espintcp: remove encap socket caching to avoid reference leak (CVE-2025-38097)
• kernel: bpf: fix ktls panic with sockmap (CVE-2025-38166)
• kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping (CVE-2025-38279)
• kernel: nfs: Clean up /proc/net/rpc/nfs when nfs_fs_proc_net_init() fails (CVE-2025-38400)
• kernel: nvmet: fix memory leak of bio integrity (CVE-2025-38405)
• kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() (CVE-2025-38441)
• kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime (CVE-2025-38470)
• kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() (CVE-2025-39866)
• kernel: dm: fix NULL pointer dereference in __dm_suspend() (CVE-2025-40134)
• kernel: wifi: mac80211_hwsim: fix typo in frequency notification (CVE-2026-23040)
• kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinuxRelease Notes linked from the References section.

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.

Updated ceph packages fix various security issues allowing authentication bypasses to gain admin privileges on the OSD, MDS, and MGR services. Notice that some of the fixes require kernel support for aes256k (introduced in kernel 7). This update will not break installs using the old (and insecure) AES keys; warnings will appear to migrate all keys (check out "ceph health detail" or "ceph status").