In the Linux kernel, the following vulnerability has been resolved: ext4: block range must be validated before use in ext4_mb_clear_bb() Block range to free is validated in ext4_free_blocks() using ext4_inode_block_valid() and then it's passed to ext4_mb_clear_bb(). However in some situations on bigalloc file system the range might be adjusted after the validation in ext4_free_blocks() which can lead to troubles on corrupted file systems such as one found by syzkaller that resulted in the following BUG kernel BUG at fs/ext4/ext4.h:3319! PREEMPT SMP NOPTI CPU: 28 PID: 4243 Comm: repro Kdump: loaded Not tainted 5.19.0-rc6+ #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1.fc35 04/01/2014 RIP: 0010:ext4_free_blocks+0x95e/0xa90 Call Trace: <TASK> ? lock_timer_base+0x61/0x80 ? __es_remove_extent+0x5a/0x760 ? __mod_timer+0x256/0x380 ? ext4_ind_truncate_ensure_credits+0x90/0x220 ext4_clear_blocks+0x107/0x1b0 ext4_free_data+0x15b/0x170 ext4_ind_truncate+0x214/0x2c0 ? _raw_spin_unlock+0x15/0x30 ? ext4_discard_preallocations+0x15a/0x410 ? ext4_journal_check_start+0xe/0x90 ? __ext4_journal_start_sb+0x2f/0x110 ext4_truncate+0x1b5/0x460 ? __ext4_journal_start_sb+0x2f/0x110 ext4_evict_inode+0x2b4/0x6f0 evict+0xd0/0x1d0 ext4_enable_quotas+0x11f/0x1f0 ext4_orphan_cleanup+0x3de/0x430 ? proc_create_seq_private+0x43/0x50 ext4_fill_super+0x295f/0x3ae0 ? snprintf+0x39/0x40 ? sget_fc+0x19c/0x330 ? ext4_reconfigure+0x850/0x850 get_tree_bdev+0x16d/0x260 vfs_get_tree+0x25/0xb0 path_mount+0x431/0xa70 __x64_sys_mount+0xe2/0x120 do_syscall_64+0x5b/0x80 ? do_user_addr_fault+0x1e2/0x670 ? exc_page_fault+0x70/0x170 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fdf4e512ace Fix it by making sure that the block range is properly validated before used every time it changes in ext4_free_blocks() or ext4_mb_clear_bb().

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - ext4: block range must be validated before use in ext4_mb_clear_bb() Block range to free is validated in     ext4_free_blocks() using ext4_inode_block_valid() and then it's passed to ext4_mb_clear_bb(). However in     some situations on bigalloc file system the range might be adjusted after the validation in     ext4_free_blocks() which can lead to troubles on corrupted file systems such as one found by syzkaller     that resulted in the following BUG kernel BUG at fs/ext4/ext4.h:3319! PREEMPT SMP NOPTI CPU: 28 PID: 4243     Comm: repro Kdump: loaded Not tainted 5.19.0-rc6+ #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),     BIOS 1.15.0-1.fc35 04/01/2014 RIP: 0010:ext4_free_blocks+0x95e/0xa90 Call Trace: <TASK> ?     lock_timer_base+0x61/0x80 ? __es_remove_extent+0x5a/0x760 ? __mod_timer+0x256/0x380 ?     ext4_ind_truncate_ensure_credits+0x90/0x220 ext4_clear_blocks+0x107/0x1b0 ext4_free_data+0x15b/0x170     ext4_ind_truncate+0x214/0x2c0 ? _raw_spin_unlock+0x15/0x30 ? ext4_discard_preallocations+0x15a/0x410 ?     ext4_journal_check_start+0xe/0x90 ? __ext4_journal_start_sb+0x2f/0x110 ext4_truncate+0x1b5/0x460 ?
    __ext4_journal_start_sb+0x2f/0x110 ext4_evict_inode+0x2b4/0x6f0 evict+0xd0/0x1d0     ext4_enable_quotas+0x11f/0x1f0 ext4_orphan_cleanup+0x3de/0x430 ? proc_create_seq_private+0x43/0x50     ext4_fill_super+0x295f/0x3ae0 ? snprintf+0x39/0x40 ? sget_fc+0x19c/0x330 ? ext4_reconfigure+0x850/0x850     get_tree_bdev+0x16d/0x260 vfs_get_tree+0x25/0xb0 path_mount+0x431/0xa70 __x64_sys_mount+0xe2/0x120     do_syscall_64+0x5b/0x80 ? do_user_addr_fault+0x1e2/0x670 ? exc_page_fault+0x70/0x170     entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fdf4e512ace Fix it by making sure that the block     range is properly validated before used every time it changes in ext4_free_blocks() or ext4_mb_clear_bb().
    (CVE-2022-50021)

Note that Nessus relies on the presence of the package as reported by the vendor.

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 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.

The version of kernel installed on the remote host is prior to 5.10.176-157.645. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.10-2024-059 advisory.

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

    ext4: block range must be validated before use in ext4_mb_clear_bb() (CVE-2022-50021)

    An issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x86_64     lacks consistency checks for CR0 and CR4. (CVE-2023-30456)

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

    ftrace: Fix invalid address access in lookup_rec() when index is 0 (CVE-2023-53075)

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

    drm/shmem-helper: Remove another errant put in error path (CVE-2023-53084)

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

    drm/i915/active: Fix misuse of non-idle barriers as fence trackers (CVE-2023-53087)

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

    ext4: fix task hung in ext4_xattr_delete_inode (CVE-2023-53089)

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

    interconnect: fix mem leak when freeing nodes (CVE-2023-53096)

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

    ext4: fix WARNING in ext4_update_inline_data (CVE-2023-53100)

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

    ext4: zero i_disksize when initializing the bootloader inode (CVE-2023-53101)

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

    net: tunnels: annotate lockless accesses to dev->needed_headroom (CVE-2023-53109)

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

    i40e: Fix kernel crash during reboot when adapter is in recovery mode (CVE-2023-53114)

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

    nvmet: avoid potential UAF in nvmet_req_complete() (CVE-2023-53116)

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

    fs: prevent out-of-bounds array speculation when closing a file descriptor (CVE-2023-53117)

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

    tcp: tcp_make_synack() can be called from process context (CVE-2023-53121)

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

    scsi: mpt3sas: Fix NULL pointer access in mpt3sas_transport_port_add() (CVE-2023-53124)

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

    net: usb: smsc75xx: Limit packet length to skb->len (CVE-2023-53125)

    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:

    bnxt_en: Avoid order-5 memory allocation for TPA data (CVE-2023-53134)

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

    ext4: Fix possible corruption when moving a directory (CVE-2023-53137)

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

    scsi: core: Remove the /proc/scsi/${proc_name} directory earlier (CVE-2023-53140)

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

    ila: do not generate empty messages in ila_xlat_nl_cmd_get_mapping() (CVE-2023-53141)

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

    ext4: fix another off-by-one fsmap error on 1k block filesystems (CVE-2023-53143)

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

    arm64: efi: Make efi_rt_lock a raw_spinlock (CVE-2023-53216)

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 5.15.104-63.140. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2023-019 advisory.

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

    ext4: block range must be validated before use in ext4_mb_clear_bb() (CVE-2022-50021)

    A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve     local privilege escalation.

    The perf_group_detach function did not check the event's siblings' attach_state before calling     add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching     from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

    We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2. (CVE-2023-2235)

    An issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x86_64     lacks consistency checks for CR0 and CR4. (CVE-2023-30456)

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

    ftrace: Fix invalid address access in lookup_rec() when index is 0 (CVE-2023-53075)

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

    drm/shmem-helper: Remove another errant put in error path (CVE-2023-53084)

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

    drm/i915/active: Fix misuse of non-idle barriers as fence trackers (CVE-2023-53087)

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

    ext4: fix task hung in ext4_xattr_delete_inode (CVE-2023-53089)

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

    ext4: update s_journal_inum if it changes after journal replay (CVE-2023-53091)

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

    interconnect: fix mem leak when freeing nodes (CVE-2023-53096)

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

    ext4: fix WARNING in ext4_update_inline_data (CVE-2023-53100)

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

    ext4: zero i_disksize when initializing the bootloader inode (CVE-2023-53101)

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

    bonding: restore bond's IFF_SLAVE flag if a non-eth dev enslave fails (CVE-2023-53103)

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

    net: tunnels: annotate lockless accesses to dev->needed_headroom (CVE-2023-53109)

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

    loop: Fix use-after-free issues (CVE-2023-53111)

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

    fs: prevent out-of-bounds array speculation when closing a file descriptor (CVE-2023-53117)

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

    tcp: tcp_make_synack() can be called from process context (CVE-2023-53121)

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

    PCI: s390: Fix use-after-free of PCI resources with per-function hotplug (CVE-2023-53123)

    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:

    bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() (CVE-2023-53133)

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

    af_unix: fix struct pid leaks in OOB support (CVE-2023-53136)

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

    ext4: Fix possible corruption when moving a directory (CVE-2023-53137)

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

    scsi: core: Remove the /proc/scsi/${proc_name} directory earlier (CVE-2023-53140)

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

    ila: do not generate empty messages in ila_xlat_nl_cmd_get_mapping() (CVE-2023-53141)

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

    ext4: fix another off-by-one fsmap error on 1k block filesystems (CVE-2023-53143)

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

    x86/resctrl: Clear staged_config[] before and after it is used (CVE-2023-53169)

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

    arm64: efi: Make efi_rt_lock a raw_spinlock (CVE-2023-53216)

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.

ID	Name	Product	Family	Severity
244444	Linux Distros Unpatched Vulnerability : CVE-2022-50021	Nessus	Misc.	high
242951	SUSE SLES15 Security Update : kernel (SUSE-SU-2025:02537-1)	Nessus	SuSE Local Security Checks	high
241963	SUSE SLES15 Security Update : kernel (SUSE-SU-2025:02264-1)	Nessus	SuSE Local Security Checks	high
200362	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2024-059 (ALASKERNEL-5.10-2024-059)	Nessus	Amazon Linux Local Security Checks	medium
176754	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2023-019 (ALASKERNEL-5.15-2023-019)	Nessus	Amazon Linux Local Security Checks	high

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