ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header

Description

In the Linux kernel, the following vulnerability has been resolved: ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header If an AF_PACKET socket is used to send packets through ipvlan and the default xmit function of the AF_PACKET socket is changed from dev_queue_xmit() to packet_direct_xmit() via setsockopt() with the option name of PACKET_QDISC_BYPASS, the skb->mac_header may not be reset and remains as the initial value of 65535, this may trigger slab-out-of-bounds bugs as following: ================================================================= UG: KASAN: slab-out-of-bounds in ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] PU: 2 PID: 1768 Comm: raw_send Kdump: loaded Not tainted 6.0.0-rc4+ #6 ardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 all Trace: print_address_description.constprop.0+0x1d/0x160 print_report.cold+0x4f/0x112 kasan_report+0xa3/0x130 ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] ipvlan_start_xmit+0x29/0xa0 [ipvlan] __dev_direct_xmit+0x2e2/0x380 packet_direct_xmit+0x22/0x60 packet_snd+0x7c9/0xc40 sock_sendmsg+0x9a/0xa0 __sys_sendto+0x18a/0x230 __x64_sys_sendto+0x74/0x90 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd The root cause is: 1. packet_snd() only reset skb->mac_header when sock->type is SOCK_RAW and skb->protocol is not specified as in packet_parse_headers() 2. packet_direct_xmit() doesn't reset skb->mac_header as dev_queue_xmit() In this case, skb->mac_header is 65535 when ipvlan_xmit_mode_l2() is called. So when ipvlan_xmit_mode_l2() gets mac header with eth_hdr() which use "skb->head + skb->mac_header", out-of-bound access occurs. This patch replaces eth_hdr() with skb_eth_hdr() in ipvlan_xmit_mode_l2() and reset mac header in multicast to solve this out-of-bound bug.

Timeline

Scores

EPSS (exploitation in 30 days)

0.25% · top 83% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.

Weakness

• CWE-125 Out-of-bounds Read (opens in a new tab)All about CWE-125 and its CVEs

Affected products

• Linux · Linux

  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < e2b46cd5796f083e452fbc624f65b80328b0c1a4
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 25efdbe5fe542c3063d1948cc4e98abcb57621ca
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < bffcdade259c05ab3436b5fab711612093c275ef
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 346e94aa4a99378592c46d6a34c72703a32bd5be
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < ab4a733874ead120691e8038272d22f8444d3638
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 8d06006c7eb75587d986da46c48ba9274f94e8e7
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < b583e6b25bf9321c91154f6c78d2173ef12c4241
  • affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 81225b2ea161af48e093f58e8dfee6d705b16af4

• Linux · Linux

  • affected 3.19
  • unaffected < 3.19
  • unaffected 4.9.330 – ≤ 4.9.*
  • unaffected 4.14.295 – ≤ 4.14.*
  • unaffected 4.19.260 – ≤ 4.19.*
  • unaffected 5.4.215 – ≤ 5.4.*
  • unaffected 5.10.146 – ≤ 5.10.*
  • unaffected 5.15.71 – ≤ 5.15.*
  • unaffected 5.19.12 – ≤ 5.19.*
  • unaffected 6.0 – ≤ *

References (8)

• https://git.kernel.org/stable/c/e2b46cd5796f083e452fbc624f65b80328b0c1a4 (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/25efdbe5fe542c3063d1948cc4e98abcb57621ca (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/bffcdade259c05ab3436b5fab711612093c275ef (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/346e94aa4a99378592c46d6a34c72703a32bd5be (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/ab4a733874ead120691e8038272d22f8444d3638 (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/8d06006c7eb75587d986da46c48ba9274f94e8e7 (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/b583e6b25bf9321c91154f6c78d2173ef12c4241 (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/81225b2ea161af48e093f58e8dfee6d705b16af4 (opens in a new tab)x_transferred

Sources

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

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-48651](https://trackcve.app/badge/CVE-2022-48651.svg)](https://trackcve.app/cve/CVE-2022-48651)

Record last updated 11 May 2026, 18:44 UTC.