Read the docs
TI-2022-25564 Aliases CVE-2022-50073GHSA-j9xf-8j9q-6cvr

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

Priority LOW 24CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00206 10th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.258, 4.15, 4.20 +5Red Hat: 2 advisoriesRed Hat: 7 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.10.24 to before 5.10.258; 4.14.226 to before 4.15; 4.19.181 to before 4.20; 5.4.106 to before 5.5; 5.11.7 to before 5.125.10.258, 4.15, 4.20, 5.5, 5.12Patch availableCNA
LinuxLinux5.12 and later5.10.258, 5.15.209, 5.19.4, 6.0Patch availableCNA
  • Linux VendorLinux Affected 5.10.24 to before 5.10.258; 4.14.226 to before 4.15; 4.19.181 to before 4.20; 5.4.106 to before 5.5; 5.11.7 to before 5.12 Fixed in 5.10.258, 4.15, 4.20, 5.5, 5.12 Patch available CNA
  • Linux VendorLinux Affected 5.12 and later Fixed in 5.10.258, 5.15.209, 5.19.4, 6.0 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.14.226 to before 4.15; 4.19.181 to before 4.20; 5.4.106 to before 5.5; 5.10.24 to before 5.11; 5.11.7 to before 5.12; 5.12.1 to before 5.19.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*5.12VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:*5.12 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:*5.12 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*5.12 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*5.12 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*5.12 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.12:rc8:*:*:*:*:*:*5.12 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14.226 to before 4.15; 4.19.181 to before 4.20; 5.4.106 to before 5.5; 5.10.24 to before 5.11; 5.11.7 to before 5.12; 5.12.1 to before 5.19.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:* Versions 5.12 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:* Versions 5.12 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:* Versions 5.12 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:* Versions 5.12 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:* Versions 5.12 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:* Versions 5.12 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.12:rc8:*:*:*:*:*:* Versions 5.12 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.258, 4.15, 4.20, 5.5, 5.12
  • Fix · CNA Linux (Linux) Fixed in 5.10.258, 5.15.209, 5.19.4, 6.0

Red Hat 2 advisories

  • RHSA-2024:9315 Released 2024-11-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers-5.14.0-503.11.1.el9_5, kernel-tools-libs-devel-5.14.0-503.11.1.el9_5, libperf-5.14.0-503.11.1.el9_5
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-503.11.1.el9_5, kernel-64k-debug-devel-matched-5.14.0-503.11.1.el9_5, kernel-64k-devel-5.14.0-503.11.1.el9_5 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.4.0-503.11.1.el9_5, kernel-5.14.0-503.11.1.el9_5, kernel-64k-5.14.0-503.11.1.el9_5 +30
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +9
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +11
  • RHSA-2021:4356 Released 2021-11-09 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-348.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-348.el8, kernel-4.18.0-348.el8, kernel-abi-stablelists-4.18.0-348.el8 +19

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:4356
Red Hat CodeReady Linux Builder (v. 9)Fixed RHSA-2024:9315
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:9315
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:4356
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2024:9315
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2024:9315
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2024:9315
Not affected: 3 products
  • Red Hat CodeReady Linux Builder (v. 9)
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux AppStream (v. 9)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-50073
  2. 2026-10-03 Alias added: GHSA-j9xf-8j9q-6cvr
  3. 2026-11-05 CISA SSVC decision points changed

References

Patch 2

Other 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences