Answer in brief
CVE-2023-52574 records a High severity (CVSS 7.8) vulnerability in team: fix null-ptr-deref when team device type is changed. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1d76efe1577b4323609b1bcbfafa8b731eda071a <1779eb51b9cc628cee551f252701a85a2a50a457 || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <a7fb47b9711101d2405b0eb1276fb1f9b9b270c7 || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <c5f6478686bb45f453031594ae19b6c9723a780d || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <b44dd92e2afd89eb6e9d27616858e72a67bdc1a7 || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <cd05eec2ee0cc396813a32ef675634e403748255 || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <2f0acb0736ecc3eb85dc80ad2790d634dcb10b58 || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <cac50d9f5d876be32cb9aa21c74018468900284d || >=1d76efe1577b4323609b1bcbfafa8b731eda071a <492032760127251e5540a5716a70996bacf2a3fd | 1779eb51b9cc628cee551f252701a85a2a50a457, a7fb47b9711101d2405b0eb1276fb1f9b9b270c7, c5f6478686bb45f453031594ae19b6c9723a780d, b44dd92e2afd89eb6e9d27616858e72a67bdc1a7, cd05eec2ee0cc396813a32ef675634e403748255, 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58, cac50d9f5d876be32cb9aa21c74018468900284d, 492032760127251e5540a5716a70996bacf2a3fd |
| Linux/Linuxgeneric | 3.7 | Not reported |
Published upstream
Mar 2, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.