In the Linux kernel, the following vulnerability has been resolved: media: dvbdev: adopts refcnt to avoid UAF dvb_unregister_device() is known that prone to use-after-free. That is, the cleanup from dvb_unregister_device() releases the dvb_device even if there are pointers stored in file->private_data still refer to it. This patch adds a reference counter into struct dvb_device and delays its deallocation until no pointer refers to the object.

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crxsa-2024_3138 advisory.

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

    Security Fix(es):

    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 Rocky Linux SIG Cloud 8.10 Release Notes     linked from the References section.

    This advisory is provided by Ctrl IQ, Inc for Rocky Linux systems. For more information about CIQ security     practices, visit https://ciq.com/security.

Tenable has extracted the preceding description block directly from the CIQ 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 CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS7:CLSA-2026:1783337441 advisory.

  - In the Linux kernel, the following vulnerability has been resolved: IB/qib: Protect from buffer overflow     in struct qib_user_sdma_pkt fields Overflowing either addrlimit or bytes_togo can allow userspace to     trigger a buffer overflow of kernel memory. Check for overflows in all the places doing math on user     controlled buffers. (CVE-2021-47485)

  - In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to     delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break     runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If     we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback     is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free     or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 nfsd: grant read     delegations to clients holding writes made this bug easier to hit, but I looked as far back as v3.0 and     it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have     been there from the beginning. (CVE-2021-47506)

  - In the Linux kernel, the following vulnerability has been resolved: proc/vmcore: fix clearing user buffer     by properly using clear_user() To clear a user buffer we cannot simply use memset, we have to use     clear_user(). With a virtio-mem device that registers a vmcore_cb and has some logically unplugged memory     inside an added Linux memory block, I can easily trigger a BUG by copying the vmcore via cp: systemd[1]:
    Starting Kdump Vmcore Save Service... kdump[420]: Kdump is using the default log level(3). kdump[453]:
    saving to /sysroot/var/crash/127.0.0.1-2021-11-11-14:59:22/ kdump[458]: saving vmcore-dmesg.txt to     /sysroot/var/crash/127.0.0.1-2021-11-11-14:59:22/ kdump[465]: saving vmcore-dmesg.txt complete kdump[467]:
    saving vmcore BUG: unable to handle page fault for address: 00007f2374e01000 #PF: supervisor write access     in kernel mode #PF: error_code(0x0003) - permissions violation PGD 7a523067 P4D 7a523067 PUD 7a528067 PMD     7a525067 PTE 800000007048f867 Oops: 0003 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 468 Comm: cp Not tainted     5.15.0+ #6 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS     rel-1.14.0-27-g64f37cc530f1-prebuilt.qemu.org 04/01/2014 RIP: 0010:read_from_oldmem.part.0.cold+0x1d/0x86     Code: ff ff ff e8 05 ff fe ff e9 b9 e9 7f ff 48 89 de 48 c7 c7 38 3b 60 82 e8 f1 fe fe ff 83 fd 08 72 3c     49 8d 7d 08 4c 89 e9 89 e8 <49> c7 45 00 00 00 00 00 49 c7 44 05 f8 00 00 00 00 48 83 e7 f81 RSP:
    0018:ffffc9000073be08 EFLAGS: 00010212 RAX: 0000000000001000 RBX: 00000000002fd000 RCX: 00007f2374e01000     RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 00007f2374e01008 RBP: 0000000000001000 R08:
    0000000000000000 R09: ffffc9000073bc50 R10: ffffc9000073bc48 R11: ffffffff829461a8 R12: 000000000000f000     R13: 00007f2374e01000 R14: 0000000000000000 R15: ffff88807bd421e8 FS: 00007f2374e12140(0000)     GS:ffff88807f000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2:
    00007f2374e01000 CR3: 000000007a4aa000 CR4: 0000000000350eb0 Call Trace: read_vmcore+0x236/0x2c0     proc_reg_read+0x55/0xa0 vfs_read+0x95/0x190 ksys_read+0x4f/0xc0 do_syscall_64+0x3b/0x90     entry_SYSCALL_64_after_hwframe+0x44/0xae Some x86-64 CPUs have a CPU feature called Supervisor Mode     Access Prevention (SMAP), which is used to detect wrong access from the kernel to user buffers like this:
    SMAP triggers a permissions violation on wrong access. In the x86-64 variant of clear_user(), SMAP is     properly handled via clac()+stac(). To fix, properly use clear_user() when we're dealing with a user     buffer. (CVE-2021-47566)

  - In the Linux kernel, the following vulnerability has been resolved: staging: rtl8192e: Fix use after free     in _rtl92e_pci_disconnect() The free_rtllib() function frees the dev pointer so there is use after free     on the next line. Re-arrange things to avoid that. (CVE-2021-47571)

  - In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Sanity check block     descriptor length in resp_mode_select() In resp_mode_select() sanity check the block descriptor len to     avoid UAF. BUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509 Read     of size 1 at addr ffff888026670f50 by task scsicmd/15032 CPU: 1 PID: 15032 Comm: scsicmd Not tainted     5.15.0-01d0625 #15 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Call Trace: <TASK>     dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107 print_address_description.constprop.9+0x28/0x160     mm/kasan/report.c:257 kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443
    __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 resp_mode_select+0xa4c/0xb40     drivers/scsi/scsi_debug.c:2509 schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483     scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537 scsi_queue_rq+0x16b4/0x2d10     drivers/scsi/scsi_lib.c:1521 blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640
    __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325     blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358 __blk_mq_run_hw_queue+0xe5/0x150     block/blk-mq.c:1762 __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839     blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891 blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-     sched.c:474 blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63 sg_common_write.isra.18+0xeb3/0x2000     drivers/scsi/sg.c:837 sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775 sg_ioctl_common+0x14d6/0x2710     drivers/scsi/sg.c:941 sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166 __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52     do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50 entry_SYSCALL_64_after_hwframe+0x44/0xae     arch/x86/entry/entry_64.S:113 (CVE-2021-47576)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-992936 advisory.

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

    media: dvbdev: adopts refcnt to avoid UAF

    dvb_unregister_device() is known that prone to use-after-free.
    That is, the cleanup from dvb_unregister_device() releases the dvb_device     even if there are pointers stored in file->private_data still refer to it.

    This patch adds a reference counter into struct dvb_device and delays its     deallocation until no pointer refers to the object.

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

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-992540 advisory.

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

    media: dvbdev: adopts refcnt to avoid UAF

    dvb_unregister_device() is known that prone to use-after-free.
    That is, the cleanup from dvb_unregister_device() releases the dvb_device     even if there are pointers stored in file->private_data still refer to it.

    This patch adds a reference counter into struct dvb_device and delays its     deallocation until no pointer refers to the object.

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

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-992205 advisory.

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

    media: dvbdev: adopts refcnt to avoid UAF

    dvb_unregister_device() is known that prone to use-after-free.
    That is, the cleanup from dvb_unregister_device() releases the dvb_device     even if there are pointers stored in file->private_data still refer to it.

    This patch adds a reference counter into struct dvb_device and delays its     deallocation until no pointer refers to the object.

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

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

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

  - media: dvbdev: adopts refcnt to avoid UAF dvb_unregister_device() is known that prone to use-after-free.
    That is, the cleanup from dvb_unregister_device() releases the dvb_device even if there are pointers     stored in file->private_data still refer to it. This patch adds a reference counter into struct dvb_device     and delays its deallocation until no pointer refers to the object. (CVE-2022-50274)

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

An update of the linux package has been released.

ID	Name	Product	Family	Type	Severity
353813	Rocky Linux 8 [CIQ] Security Update: bpftool / bpftool-debuginfo / kernel / kernel-abi-stablelists / etc Multiple Vulnerabilities (crxsa-2024_3138)	Nessus	Rocky Linux Local Security Checks	Local	critical
352867	CentOS Linux 7 [TuxCare] Security Update: bpftool / kernel / kernel-debug / kernel-debug-devel / kernel-devel / etc Multiple Vulnerabilities (CENTOS7:CLSA-2026:1783337441)	Nessus	CentOS Local Security Checks	Local	high
302981	EulerOS Virtualization 2.13.1 : kernel (EulerOS-SA-2026-1637)	Nessus	Huawei Local Security Checks	Local	high
302971	EulerOS Virtualization 2.13.0 : kernel (EulerOS-SA-2026-1629)	Nessus	Huawei Local Security Checks	Local	high
297598	EulerOS 2.0 SP13 : kernel (EulerOS-SA-2026-1212)	Nessus	Huawei Local Security Checks	Local	high
297592	EulerOS 2.0 SP13 : kernel (EulerOS-SA-2026-1224)	Nessus	Huawei Local Security Checks	Local	high
281105	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992936)	Nessus	Unity Linux Local Security Checks	Local	high
280653	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992540)	Nessus	Unity Linux Local Security Checks	Local	high
280551	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992205)	Nessus	Unity Linux Local Security Checks	Local	high
264946	Linux Distros Unpatched Vulnerability : CVE-2022-50274	Nessus	Misc.	Local	high
153035	Photon OS 4.0: Linux PHSA-2021-4.0-0095	Nessus	PhotonOS Local Security Checks	Local	high

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CVE-2022-50274

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