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ALSA-2026:2721 — Moderate: kernel security update

Affected: AlmaLinux:10: kernel-abi-stablelists, AlmaLinux:10: kernel-doc

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

Security Fix(es):

* kernel: ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans (CVE-2023-53034) * kernel: Linux kernel erofs: Use-After-Free due to device type mismatch (CVE-2025-38172) * kernel: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064) * kernel: Bluetooth: ISO: Fix possible UAF on iso_conn_free (CVE-2025-40141) * kernel: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service (CVE-2025-40269) * kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349) * kernel: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec (CVE-2026-22998)

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.

bdu:2025-16409

BELL-CVE-2025-40064

Affected: Alpaquita:23: linux-lts, Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2025-avi-0941 — De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoqu…

certfr-2025-avi-0941

ESSA-2026:0155 — Important: kernel security, bug fix, and enhancement update

Important: kernel security, bug fix, and enhancement update

EUVD-2026-362955

fkie_cve-2025-40064

In the Linux kernel, the following vulnerability has been resolved:

smc: Fix use-after-free in __pnet_find_base_ndev().

syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0]

smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes down to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened at __pnet_find_base_ndev() when the dev is first used.

This means dev had already been freed before acquiring RTNL in pnet_find_base_ndev().

While dev is going away, dst->dev could be swapped with blackhole_netdev, and the dev's refcnt by dst will be released.

We must hold dev's refcnt before calling smc_pnet_find_ism_resource().

Also, smc_pnet_find_roce_resource() has the same problem.

Let's use __sk_dst_get() and dst_dev_rcu() in the two functions.

[0]: BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609

CPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline] s…

GHSA-c442-5cxr-p4xq

In the Linux kernel, the following vulnerability has been resolved:

smc: Fix use-after-free in __pnet_find_base_ndev().

syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0]

smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes down to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened at __pnet_find_base_ndev() when the dev is first used.

This means dev had already been freed before acquiring RTNL in pnet_find_base_ndev().

While dev is going away, dst->dev could be swapped with blackhole_netdev, and the dev's refcnt by dst will be released.

We must hold dev's refcnt before calling smc_pnet_find_ism_resource().

Also, smc_pnet_find_roce_resource() has the same problem.

Let's use __sk_dst_get() and dst_dev_rcu() in the two functions.

[0]: BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609

msrc_CVE-2025-40064 — smc: Fix use-after-free in __pnet_find_base_ndev().

msrc_CVE-2025-40064

RHSA-2026:27708 — Red Hat Security Advisory: kernel security, bug fix, and enhancement update

kernel: ceph: kernel: Ceph: exploit of hardcoded IVECs, in a misuse of AES, resulting in authentication bypass kernel: smc: Fix use-after-free in __pnet_find_base_ndev() kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match() kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state kernel: netfilter: ctnetlink: ensure safe access to master conntrack kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks kernel: mm/page_alloc: clear page->private in free_pages_prepare() kernel: RDMA/iwcm: Fix workqueue list corruption by removing work_list kernel: wifi: mac80211: remove station if connection prep fails kernel: wifi: mac80211: use safe list iteration in radar detect work kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs kernel: net/sched: act_pedit: extend the writable skb range per key

RLSA-2026:63129 — Important: kernel security, bug fix, and enhancement update

Affected: Rocky Linux:9: kernel

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

Security Fix(es):

* kernel: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064)

* kernel: Linux kernel: Denial of Service due to memory leak in tpm2_load_cmd (CVE-2025-71147)

* kernel: bonding: alb: fix UAF in rlb_arp_recv during bond up/down (CVE-2026-45970)

* kernel: smb/client: fix out-of-bounds read in symlink_data() (CVE-2026-46185)

* kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)

* kernel: pNFS: Fix use-after-free in pnfs_update_layout() (CVE-2026-63800)

* kernel: nfsd: fix posix_acl leak on SETACL decode failure (CVE-2026-53397)

* kernel: exfat: fix potential use-after-free in exfat_find_dir_entry() (CVE-2026-63808)

* kernel: nfsd: release layout stid on setlease failure (CVE-2026-53399)

* kernel: NFSv4/flexfiles: reject zero filehandle version count (CVE-2026-53392)

* kernel: KEYS: fix overflow in keyctl_pkey_params_get_2() (CVE-2026-63824)

* kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr (CVE-2026-53391)

* kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode (CVE-2026-63886)

* kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)

* kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access (CVE-2026-64018)

* kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-…

SUSE-SU-2025:4422-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

UBUNTU-CVE-2025-40064

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:Pro:18.04:LTS: linux-aws-5.4, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:Pro:18.04:LTS: linux-azure-5.4, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3 and 203 more

In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in __pnet_find_base_ndev(). syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0] smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes down to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened at __pnet_find_base_ndev() when the dev is first used. This means dev had already been freed before acquiring RTNL in pnet_find_base_ndev(). While dev is going away, dst->dev could be swapped with blackhole_netdev, and the dev's refcnt by dst will be released. We must hold dev's refcnt before calling smc_pnet_find_ism_resource(). Also, smc_pnet_find_roce_resource() has the same problem. Let's use __sk_dst_get() and dst_dev_rcu() in the two functions. [0]: BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609 CPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline] smc_pnet_fi…

WID-SEC-W-2025-2431 — Linux Kernel: Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen im Linux-Kernel ausnutzen, um beliebigen Code auszuführen, privilegierten Zugriff zu erlangen, sensible Informationen zu stehlen oder betroffene Systeme funktionsunfähig zu machen.