In the Linux kernel, the following vulnerability has been resolved: net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null Fixes a NULL pointer derefence bug triggered from tap driver. When tap_get_user calls virtio_net_hdr_to_skb the skb->dev is null (in tap.c skb->dev is set after the call to virtio_net_hdr_to_skb) virtio_net_hdr_to_skb calls dev_parse_header_protocol which needs skb->dev field to be valid. The line that trigers the bug is in dev_parse_header_protocol (dev is at offset 0x10 from skb and is stored in RAX register) if (!dev->header_ops || !dev->header_ops->parse_protocol) 22e1: mov 0x10(%rbx),%rax 22e5: mov 0x230(%rax),%rax Setting skb->dev before the call in tap.c fixes the issue. BUG: kernel NULL pointer dereference, address: 0000000000000230 RIP: 0010:virtio_net_hdr_to_skb.constprop.0+0x335/0x410 [tap] Code: c0 0f 85 b7 fd ff ff eb d4 41 39 c6 77 cf 29 c6 48 89 df 44 01 f6 e8 7a 79 83 c1 48 85 c0 0f 85 d9 fd ff ff eb b7 48 8b 43 10 <48> 8b 80 30 02 00 00 48 85 c0 74 55 48 8b 40 28 48 85 c0 74 4c 48 RSP: 0018:ffffc90005c27c38 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888298f25300 RCX: 0000000000000010 RDX: 0000000000000005 RSI: ffffc90005c27cb6 RDI: ffff888298f25300 RBP: ffffc90005c27c80 R08: 00000000ffffffea R09: 00000000000007e8 R10: ffff88858ec77458 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000014 R14: ffffc90005c27e08 R15: ffffc90005c27cb6 FS: 0000000000000000(0000) GS:ffff88858ec40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000230 CR3: 0000000281408006 CR4: 00000000003706e0 Call Trace: tap_get_user+0x3f1/0x540 [tap] tap_sendmsg+0x56/0x362 [tap] ? get_tx_bufs+0xc2/0x1e0 [vhost_net] handle_tx_copy+0x114/0x670 [vhost_net] handle_tx+0xb0/0xe0 [vhost_net] handle_tx_kick+0x15/0x20 [vhost_net] vhost_worker+0x7b/0xc0 [vhost] ? vhost_vring_call_reset+0x40/0x40 [vhost] kthread+0xfa/0x120 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x1f/0x30

The version of kernel installed on the remote host is prior to 5.4.296-217.423. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.4-2025-105 advisory.

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

    net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null (CVE-2022-50073)

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

    btrfs: don't abort filesystem when attempting to snapshot deleted subvolume (CVE-2024-26644)

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

    ACPI: PAD: fix crash in exit_round_robin() (CVE-2024-49935)

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

    serial: mctrl_gpio: split disable_ms into sync and no_sync APIs (CVE-2025-38040)

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

    virtio: break and reset virtio devices on device_shutdown() (CVE-2025-38064)

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

    RDMA/mlx5: Fix error flow upon firmware failure for RQ destruction (CVE-2025-38161)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 5.15.189-131.202. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2025-086 advisory.

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

    net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null (CVE-2022-50073)

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

    codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() (CVE-2025-37798)

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

    xsk: Fix race condition in AF_XDP generic RX path (CVE-2025-37920)

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

    sch_htb: make htb_qlen_notify() idempotent (CVE-2025-37932)

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

    serial: mctrl_gpio: split disable_ms into sync and no_sync APIs (CVE-2025-38040)

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

    virtio: break and reset virtio devices on device_shutdown() (CVE-2025-38064)

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

    rseq: Fix segfault on registration when rseq_cs is non-zero (CVE-2025-38067)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 4.14.355-280.664. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2955 advisory.

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

    net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null (CVE-2022-50073)

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

    SUNRPC: Fix a server shutdown leak (CVE-2023-53131)

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

    codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() (CVE-2025-37798)

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

    sch_htb: make htb_qlen_notify() idempotent (CVE-2025-37932)

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

    __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock (CVE-2025-38058)

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

    virtio: break and reset virtio devices on device_shutdown() (CVE-2025-38064)

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

    mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). (CVE-2025-38324)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02537-1 advisory.

    The SUSE Linux Enterprise 15 SP4 kernel was updated to receive various security bugfixes.


    The following security bugs were fixed:

    - CVE-2021-47557: net/sched: sch_ets: do not peek at classes beyond 'nbands' (bsc#1207361 bsc#1225468).
    - CVE-2021-47595: net/sched: sch_ets: do not remove idle classes from the round-robin list (bsc#1207361     bsc#1226552).
    - CVE-2023-52924: netfilter: nf_tables: do not skip expired elements during walk (bsc#1236821).
    - CVE-2023-52925: netfilter: nf_tables: do not fail inserts if duplicate has expired (bsc#1236822).
    - CVE-2024-26808: netfilter: nft_chain_filter: handle NETDEV_UNREGISTER for inet/ingress basechain     (bsc#1222634).
    - CVE-2024-26924: scsi: lpfc: Release hbalock before calling lpfc_worker_wake_up() (bsc#1225820).
    - CVE-2024-27397: kabi: place tstamp needed for nftables set in a hole (bsc#1224095).
    - CVE-2024-36978: net: sched: sch_multiq: fix possible OOB write in multiq_tune() (bsc#1226514).
    - CVE-2024-46800: sch/netem: fix use after free in netem_dequeue (bsc#1230827).
    - CVE-2024-53057: net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT (bsc#1233551).
    - CVE-2024-53125: bpf: sync_linked_regs() must preserve subreg_def (bsc#1234156).
    - CVE-2024-53141: netfilter: ipset: add missing range check in bitmap_ip_uadt (bsc#1234381).
    - CVE-2024-56770: sch/netem: fix use after free in netem_dequeue (bsc#1235637).
    - CVE-2024-57947: netfilter: nf_set_pipapo: fix initial map fill (bsc#1236333).
    - CVE-2025-21700: net: sched: Disallow replacing of child qdisc from one parent to another (bsc#1237159).
    - CVE-2025-21702: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 (bsc#1237312).
    - CVE-2025-21703: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() (bsc#1237313).
    - CVE-2025-21756: vsock: Orphan socket after transport release (bsc#1238876).
    - CVE-2025-23141: KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses     (bsc#1242782).
    - CVE-2025-37752: net_sched: sch_sfq: move the limit validation (bsc#1242504).
    - CVE-2025-37797: net_sched: hfsc: Fix a UAF vulnerability in class handling (bsc#1242417).
    - CVE-2025-37823: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too (bsc#1242924).
    - CVE-2025-37890: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc     (bsc#1243330).
    - CVE-2025-37997: netfilter: ipset: fix region locking in hash types (bsc#1243832).
    - CVE-2025-38000: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (bsc#1244277).
    - CVE-2025-38001: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (bsc#1244234).
    - CVE-2025-38014: dmaengine: idxd: Refactor remove call with idxd_cleanup() helper (bsc#1244732).
    - CVE-2025-38083: net_sched: prio: fix a race in prio_tune() (bsc#1245183).


Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02334-1 advisory.

    The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security bugfixes.

    The following security bugs were fixed:

    - CVE-2021-47212: net/mlx5: Update error handler for UCTX and UMEM (bsc#1222709).
    - CVE-2021-47455: ptp: Fix possible memory leak in ptp_clock_register() (bsc#1225254).
    - CVE-2021-47527: serial: core: fix transmit-buffer reset and memleak (bsc#1227768).
    - CVE-2022-21546: scsi: target: Fix WRITE_SAME No Data Buffer crash (bsc#1242243).
    - CVE-2022-49154: KVM: SVM: fix panic on out-of-bounds guest IRQ (bsc#1238167).
    - CVE-2022-49622: netfilter: nf_tables: fix crash when nf_trace is enabled (bsc#1239042).
    - CVE-2022-49731: ata: libata-core: fix NULL pointer deref in ata_host_alloc_pinfo() (bsc#1239071).
    - CVE-2022-49764: kABI: workaround 'bpf: Prevent bpf program recursion for raw tracepoint probes' changes     (bsc#1242301).
    - CVE-2022-49780: scsi: target: tcm_loop: Fix possible name leak in tcm_loop_setup_hba_bus()     (bsc#1242262).
    - CVE-2022-49814: kcm: close race conditions on sk_receive_queue (bsc#1242498).
    - CVE-2022-49879: ext4: fix BUG_ON() when directory entry has invalid rec_len (bsc#1242733).
    - CVE-2022-49881: wifi: cfg80211: fix memory leak in query_regdb_file() (bsc#1242481).
    - CVE-2022-49917: ipvs: fix WARNING in ip_vs_app_net_cleanup() (bsc#1242406).
    - CVE-2022-49921: net: sched: Fix use after free in red_enqueue() (bsc#1242359).
    - CVE-2022-50055: iavf: Fix adminq error handling (bsc#1245039).
    - CVE-2022-50087: firmware: arm_scpi: Ensure scpi_info is not assigned if the probe fails (bsc#1245119).
    - CVE-2022-50134: RDMA/hfi1: fix potential memory leak in setup_base_ctxt() (bsc#1244802).
    - CVE-2022-50200: selinux: Add boundary check in put_entry() (bsc#1245149).
    - CVE-2023-52500: Fixed information leaking when processing OPC_INB_SET_CONTROLLER_CONFIG command     (bsc#1220883).
    - CVE-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation (bsc#1239644).
    - CVE-2023-53020: l2tp: fix lockdep splat (bsc#1240224).
    - CVE-2023-53090: drm/amdkfd: Fix an illegal memory access (bsc#1242753).
    - CVE-2023-53091: ext4: update s_journal_inum if it changes after journal replay (bsc#1242767).
    - CVE-2023-53133: bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser()     (bsc#1242423).
    - CVE-2024-26586: mlxsw: spectrum_acl_tcam: Fix stack corruption (bsc#1220243).
    - CVE-2024-26825: nfc: nci: free rx_data_reassembly skb on NCI device cleanup (bsc#1223065).
    - CVE-2024-26872: RDMA/srpt: Do not register event handler until srpt device is fully setup (bsc#1223115).
    - CVE-2024-26875: media: pvrusb2: fix uaf in pvr2_context_set_notify (bsc#1223118).
    - CVE-2024-35790: usb: typec: altmodes/displayport: create sysfs nodes as driver's default device     attribute group (bsc#1224712).
    - CVE-2024-35839: kABI fix for netfilter: bridge: replace physindev with physinif in nf_bridge_info     (bsc#1224726).
    - CVE-2024-38588: ftrace: Fix possible use-after-free issue in ftrace_location() (bsc#1226837).
    - CVE-2024-57982: xfrm: state: fix out-of-bounds read during lookup (bsc#1237913).
    - CVE-2025-21898: ftrace: Avoid potential division by zero in function_stat_show() (bsc#1240610).
    - CVE-2025-21920: vlan: enforce underlying device type (bsc#1240686).
    - CVE-2025-21971: net_sched: Prevent creation of classes with TC_H_ROOT (bsc#1240799).
    - CVE-2025-22035: tracing: Fix use-after-free in print_graph_function_flags during tracer switching     (bsc#1241544).
    - CVE-2025-23149: tpm: do not start chip while suspended (bsc#1242758).
    - CVE-2025-37756: net: tls: explicitly disallow disconnect (bsc#1242515).
    - CVE-2025-37757: tipc: fix memory leak in tipc_link_xmit (bsc#1242521).
    - CVE-2025-37781: i2c: cros-ec-tunnel: defer probe if parent EC is not present (bsc#1242575).
    - CVE-2025-37800: driver core: fix potential NULL pointer dereference in dev_uevent() (bsc#1242849).
    - CVE-2025-37810: usb: dwc3: gadget: check that event count does not exceed event buffer length     (bsc#1242906).
    - CVE-2025-37836: PCI: Fix reference leak in pci_register_host_bridge() (bsc#1242957).
    - CVE-2025-37844: cifs: avoid NULL pointer dereference in dbg call (bsc#1242946).
    - CVE-2025-37862: HID: pidff: Fix null pointer dereference in pidff_find_fields (bsc#1242982).
    - CVE-2025-37892: mtd: inftlcore: Add error check for inftl_read_oob() (bsc#1243536).
    - CVE-2025-37911: bnxt_en: Fix out-of-bound memcpy() during ethtool -w (bsc#1243469).
    - CVE-2025-37923: tracing: Fix oob write in trace_seq_to_buffer() (bsc#1243551).
    - CVE-2025-37927: iommu/amd: Fix potential buffer overflow in parse_ivrs_acpihid (bsc#1243620).
    - CVE-2025-37928: dm-bufio: do not schedule in atomic context (bsc#1243621).
    - CVE-2025-37961: ipvs: fix uninit-value for saddr in do_output_route4 (bsc#1243523).
    - CVE-2025-37980: block: fix resource leak in blk_register_queue() error path (bsc#1243522).
    - CVE-2025-37982: wifi: wl1251: fix memory leak in wl1251_tx_work (bsc#1243524).
    - CVE-2025-37992: net_sched: Flush gso_skb list too during ->change() (bsc#1243698).
    - CVE-2025-37995: module: ensure that kobject_put() is safe for module type kobjects (bsc#1243827).
    - CVE-2025-37998: openvswitch: Fix unsafe attribute parsing in output_userspace() (bsc#1243836).
    - CVE-2025-38000: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (bsc#1244277).
    - CVE-2025-38004: can: bcm: add locking for bcm_op runtime updates (bsc#1244274).
    - CVE-2025-38023: nfs: handle failure of nfs_get_lock_context in unlock path (bsc#1245004).
    - CVE-2025-38024: RDMA/rxe: Fix slab-use-after-free Read in rxe_queue_cleanup bug (bsc#1245025).
    - CVE-2025-38061: net: pktgen: fix access outside of user given buffer in pktgen_thread_write()     (bsc#1245440).
    - CVE-2025-38072: libnvdimm/labels: Fix divide error in nd_label_data_init() (bsc#1244743).
    - CVE-2025-38078: ALSA: pcm: Fix race of buffer access at PCM OSS layer (bsc#1244737).
    - CVE-2025-38083: net_sched: prio: fix a race in prio_tune() (bsc#1245183).


Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02264-1 advisory.

    The SUSE Linux Enterprise 15 SP5 kernel was updated to receive various security bugfixes.


    The following security bugs were fixed:

    - CVE-2021-47557: net/sched: sch_ets: do not peek at classes beyond 'nbands' (bsc#1207361 bsc#1225468).
    - CVE-2021-47595: net/sched: sch_ets: do not remove idle classes from the round-robin list (bsc#1207361     bsc#1226552).
    - CVE-2023-52924: netfilter: nf_tables: do not skip expired elements during walk (bsc#1236821).
    - CVE-2023-52925: netfilter: nf_tables: do not fail inserts if duplicate has expired (bsc#1236822).
    - CVE-2024-26808: netfilter: nft_chain_filter: handle NETDEV_UNREGISTER for inet/ingress basechain     (bsc#1222634).
    - CVE-2024-26924: scsi: lpfc: Release hbalock before calling lpfc_worker_wake_up() (bsc#1225820).
    - CVE-2024-27397: kabi: place tstamp needed for nftables set in a hole (bsc#1224095).
    - CVE-2024-36978: net: sched: sch_multiq: fix possible OOB write in multiq_tune() (bsc#1226514).
    - CVE-2024-46800: sch/netem: fix use after free in netem_dequeue (bsc#1230827).
    - CVE-2024-53125: bpf: sync_linked_regs() must preserve subreg_def (bsc#1234156).
    - CVE-2024-53141: netfilter: ipset: add missing range check in bitmap_ip_uadt (bsc#1234381).
    - CVE-2024-53197: ALSA: usb-audio: Fix potential out-of-bound accesses for Extigy and Mbox devices     (bsc#1235464).
    - CVE-2024-56770: sch/netem: fix use after free in netem_dequeue (bsc#1235637).
    - CVE-2025-21700: net: sched: Disallow replacing of child qdisc from one parent to another (bsc#1237159).
    - CVE-2025-21702: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 (bsc#1237312).
    - CVE-2025-21703: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() (bsc#1237313).
    - CVE-2025-21756: vsock: Orphan socket after transport release (bsc#1238876).
    - CVE-2025-23141: KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses     (bsc#1242782).
    - CVE-2025-37752: net_sched: sch_sfq: move the limit validation (bsc#1242504).
    - CVE-2025-37823: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too (bsc#1242924).
    - CVE-2025-37890: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc     (bsc#1243330).
    - CVE-2025-37997: netfilter: ipset: fix region locking in hash types (bsc#1243832).
    - CVE-2025-38000: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (bsc#1244277).
    - CVE-2025-38001: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (bsc#1244234).
    - CVE-2025-38014: dmaengine: idxd: Refactor remove call with idxd_cleanup() helper (bsc#1244732).
    - CVE-2025-38060: bpf: abort verification if env->cur_state->loop_entry != NULL (bsc#1245155).
    - CVE-2025-38083: net_sched: prio: fix a race in prio_tune() (bsc#1245183).


Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
243437	Amazon Linux 2 : kernel (ALASKERNEL-5.4-2025-105)	Nessus	Amazon Linux Local Security Checks	medium
243433	Amazon Linux 2 : kernel (ALASKERNEL-5.15-2025-086)	Nessus	Amazon Linux Local Security Checks	high
243420	Amazon Linux 2 : kernel (ALAS-2025-2955)	Nessus	Amazon Linux Local Security Checks	high
242951	SUSE SLES15 Security Update : kernel (SUSE-SU-2025:02537-1)	Nessus	SuSE Local Security Checks	high
242218	SUSE SLES12 Security Update : kernel (SUSE-SU-2025:02334-1)	Nessus	SuSE Local Security Checks	critical
241963	SUSE SLES15 Security Update : kernel (SUSE-SU-2025:02264-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2022-50073

medium

Tenable Plugins

medium

high

high

high

critical

high