Linux Distros Unpatched Vulnerability : CVE-2022-49689

medium Nessus Plugin ID 225826

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

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

- In the Linux kernel, the following vulnerability has been resolved: xen-blkfront: Handle NULL gendisk When a VBD is not fully created and then closed, the kernel can have a NULL pointer dereference: The reproducer is trivial: [user@dom0 ~]$ sudo xl block-attach work backend=sys-usb vdev=xvdi target=/dev/sdz [user@dom0 ~]$ xl block-list work Vdev BE handle state evt-ch ring-ref BE-path 51712 0 241 4 -1 -1 /local/domain/0/backend/vbd/241/51712 51728 0 241 4 -1 -1 /local/domain/0/backend/vbd/241/51728 51744 0 241 4 -1 -1 /local/domain/0/backend/vbd/241/51744 51760 0 241 4 -1 -1 /local/domain/0/backend/vbd/241/51760 51840 3 241 3 -1 -1 /local/domain/3/backend/vbd/241/51840 ^ note state, the /dev/sdz doesn't exist in the backend [user@dom0 ~]$ sudo xl block-detach work xvdi [user@dom0 ~]$ xl block-list work Vdev BE handle state evt-ch ring-ref BE-path work is an invalid domain identifier And its console has: BUG: kernel NULL pointer dereference, address: 0000000000000050 PGD 80000000edebb067 P4D 80000000edebb067 PUD edec2067 PMD 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 52 Comm: xenwatch Not tainted 5.16.18-2.43.fc32.qubes.x86_64 #1 RIP: 0010:blk_mq_stop_hw_queues+0x5/0x40 Code: 00 48 83 e0 fd 83 c3 01 48 89 85 a8 00 00 00 41 39 5c 24 50 77 c0 5b 5d 41 5c 41 5d c3 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 <8b> 47 50 85 c0 74 32 41 54 49 89 fc 55 53 31 db 49 8b 44 24 48 48 RSP: 0018:ffffc90000bcfe98 EFLAGS:
00010293 RAX: ffffffffc0008370 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000000000 RSI:
0000000000000005 RDI: 0000000000000000 RBP: ffff88800775f000 R08: 0000000000000001 R09: ffff888006e620b8 R10: ffff888006e620b0 R11: f000000000000000 R12: ffff8880bff39000 R13: ffff8880bff39000 R14:
0000000000000000 R15: ffff88800604be00 FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000050 CR3:
00000000e932e002 CR4: 00000000003706e0 Call Trace: <TASK> blkback_changed+0x95/0x137 [xen_blkfront] ? read_reply+0x160/0x160 xenwatch_thread+0xc0/0x1a0 ? do_wait_intr_irq+0xa0/0xa0 kthread+0x16b/0x190 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30 </TASK> Modules linked in: snd_seq_dummy snd_hrtimer snd_seq snd_seq_device snd_timer snd soundcore ipt_REJECT nf_reject_ipv4 xt_state xt_conntrack nft_counter nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables nfnetlink intel_rapl_msr intel_rapl_common crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel xen_netfront pcspkr xen_scsiback target_core_mod xen_netback xen_privcmd xen_gntdev xen_gntalloc xen_blkback xen_evtchn ipmi_devintf ipmi_msghandler fuse bpf_preload ip_tables overlay xen_blkfront CR2:
0000000000000050 ---[ end trace 7bc9597fd06ae89d ]--- RIP: 0010:blk_mq_stop_hw_queues+0x5/0x40 Code: 00 48 83 e0 fd 83 c3 01 48 89 85 a8 00 00 00 41 39 5c 24 50 77 c0 5b 5d 41 5c 41 5d c3 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 <8b> 47 50 85 c0 74 32 41 54 49 89 fc 55 53 31 db 49 8b 44 24 48 48 RSP:
0018:ffffc90000bcfe98 EFLAGS: 00010293 RAX: ffffffffc0008370 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff88800775f000 R08:
0000000000000001 R09: ffff888006e620b8 R10: ffff888006e620b0 R11: f000000000000000 R12: ffff8880bff39000 R13: ffff8880bff39000 R14: 0000000000000000 R15: ffff88800604be00 FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2:
0000000000000050 CR3: 00000000e932e002 CR4: 00000000003706e0 Kernel panic - not syncing: Fatal exception Kernel Offset: disabled info->rq and info->gd are only set in blkfront_connect(), which is called for state 4 (XenbusStateConnected). Guard against using NULL variables in blkfront_closing() to avoid
---truncated--- (CVE-2022-49689)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 225826

File Name: unpatched_CVE_2022_49689.nasl

Version: 1.1

Type: local

Agent: unix

Family: Misc.

Published: 3/5/2025

Updated: 3/5/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2022-49689

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/26/2025

Reference Information

CVE: CVE-2022-49689

Detections

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