Skip to content
TrackCVE
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2022-50073

net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null

Medium5.5EPSS 0.21%
Published
Updated
Reserved
Assigned by
Linux

Description

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

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 17 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2022-50073, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.21% · top 89% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

  • Linux · Linux

    • affected faa3baa2828c5e1c4374f3e60041f75c64f5fcb6 – < 8f90163f9e013c8fc791aab338aab44a46044cfc
    • affected 924a9bc362a5223cd448ca08c3dde21235adc310 – < 447ba770cfe798925f4923548b367fd49f0ee5f0
    • affected 924a9bc362a5223cd448ca08c3dde21235adc310 – < dd29648fcf69339713f2d25f7014ae905dcdfc18
    • affected 924a9bc362a5223cd448ca08c3dde21235adc310 – < 4f61f133f354853bc394ec7d6028adb9b02dd701
    • affected ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d
    • affected 54ef8243c3c8e90f1ea5792e6752e021a25c8eb3
    • affected ca278267d6cd9544645731732455b6b20cb0e895
    • affected 99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748
    • affected 5.10.24 – < 5.10.258
    • affected 4.14.226 – < 4.15
    • affected 4.19.181 – < 4.20
    • affected 5.4.106 – < 5.5
    • affected 5.11.7 – < 5.12

  • Linux · Linux

    • affected 5.12
    • unaffected < 5.12
    • unaffected 5.10.258 – ≤ 5.10.*
    • unaffected 5.15.209 – ≤ 5.15.*
    • unaffected 5.19.4 – ≤ 5.19.*
    • unaffected 6.0 – ≤ *

References (5)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2022-50073 badge
[![CVE-2022-50073](https://trackcve.app/badge/CVE-2022-50073.svg)](https://trackcve.app/cve/CVE-2022-50073)

Record last updated .