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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2023-52574

team: fix null-ptr-deref when team device type is changed

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: team: fix null-ptr-deref when team device type is changed Get a null-ptr-deref bug as follows with reproducer [1]. BUG: kernel NULL pointer dereference, address: 0000000000000228 ... RIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q] ... Call Trace: <TASK> ? __die+0x24/0x70 ? page_fault_oops+0x82/0x150 ? exc_page_fault+0x69/0x150 ? asm_exc_page_fault+0x26/0x30 ? vlan_dev_hard_header+0x35/0x140 [8021q] ? vlan_dev_hard_header+0x8e/0x140 [8021q] neigh_connected_output+0xb2/0x100 ip6_finish_output2+0x1cb/0x520 ? nf_hook_slow+0x43/0xc0 ? ip6_mtu+0x46/0x80 ip6_finish_output+0x2a/0xb0 mld_sendpack+0x18f/0x250 mld_ifc_work+0x39/0x160 process_one_work+0x1e6/0x3f0 worker_thread+0x4d/0x2f0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe5/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 [1] $ teamd -t team0 -d -c '{"runner": {"name": "loadbalance"}}' $ ip link add name t-dummy type dummy $ ip link add link t-dummy name t-dummy.100 type vlan id 100 $ ip link add name t-nlmon type nlmon $ ip link set t-nlmon master team0 $ ip link set t-nlmon nomaster $ ip link set t-dummy up $ ip link set team0 up $ ip link set t-dummy.100 down $ ip link set t-dummy.100 master team0 When enslave a vlan device to team device and team device type is changed from non-ether to ether, header_ops of team device is changed to vlan_header_ops. That is incorrect and will trigger null-ptr-deref for vlan->real_dev in vlan_dev_hard_header() because team device is not a vlan device. Cache eth_header_ops in team_setup(), then assign cached header_ops to header_ops of team net device when its type is changed from non-ether to ether to fix the bug.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < 1779eb51b9cc628cee551f252701a85a2a50a457affected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < a7fb47b9711101d2405b0eb1276fb1f9b9b270c7affected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < c5f6478686bb45f453031594ae19b6c9723a780daffected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < b44dd92e2afd89eb6e9d27616858e72a67bdc1a7affected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < cd05eec2ee0cc396813a32ef675634e403748255affected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58affected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < cac50d9f5d876be32cb9aa21c74018468900284daffected
  • 1d76efe1577b4323609b1bcbfafa8b731eda071a to < 492032760127251e5540a5716a70996bacf2a3fdaffected

Linux Linux

Default version status: affected

  • 3.7affected
  • 0 to < 3.7unaffected
  • 4.14.327 to ≤ 4.14.*unaffected
  • 4.19.296 to ≤ 4.19.*unaffected
  • 5.4.258 to ≤ 5.4.*unaffected
  • 5.10.198 to ≤ 5.10.*unaffected
  • 5.15.134 to ≤ 5.15.*unaffected
  • 6.1.56 to ≤ 6.1.*unaffected
  • 6.5.6 to ≤ 6.5.*unaffected
  • 6.6 to ≤ *unaffected

References