{"id":"CVE-2023-52574","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nteam: fix null-ptr-deref when team device type is changed\n\nGet a null-ptr-deref bug as follows with reproducer [1].\n\nBUG: kernel NULL pointer dereference, address: 0000…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nteam: fix null-ptr-deref when team device type is changed\n\nGet a null-ptr-deref bug as follows with reproducer [1].\n\nBUG: kernel NULL pointer dereference, address: 0000…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.7, < 4.14.327","linux_kernel >= 4.15, < 4.19.296","linux_kernel >= 4.20, < 5.4.258","linux_kernel >= 5.5, < 5.10.198","linux_kernel >= 5.11, < 5.15.134","linux_kernel >= 5.16, < 6.1.56","linux_kernel >= 6.2, < 6.5.6","linux_kernel = 6.6"],"patched":["linux_kernel 6.5.6"],"published":"2024-03-02","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-52574","references":[{"url":"https://git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.0024,"epssPercentile":0.15335,"ingestedAt":"2026-08-05T05:58:02.311Z","slug":"CVE-2023-52574","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nteam: fix null-ptr-deref when team device type is changed\n\nGet a null-ptr-deref bug as follows with reproducer [1].\n\nBUG: kernel NULL pointer dereference, address: 0000000000000228\n...\nRIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q]\n...\nCall Trace:\n <TASK>\n ? __die+0x24/0x70\n ? page_fault_oops+0x82/0x150\n ? exc_page_fault+0x69/0x150\n ? asm_exc_page_fault+0x26/0x30\n ? vlan_dev_hard_header+0x35/0x140 [8021q]\n ? vlan_dev_hard_header+0x8e/0x140 [8021q]\n neigh_connected_output+0xb2/0x100\n ip6_finish_output2+0x1cb/0x520\n ? nf_hook_slow+0x43/0xc0\n ? ip6_mtu+0x46/0x80\n ip6_finish_output+0x2a/0xb0\n mld_sendpack+0x18f/0x250\n mld_ifc_work+0x39/0x160\n process_one_work+0x1e6/0x3f0\n worker_thread+0x4d/0x2f0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xe5/0x120\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1b/0x30\n\n[1]\n$ teamd -t team0 -d -c '{\"runner\": {\"name\": \"loadbalance\"}}'\n$ ip link add name t-dummy type dummy\n$ ip link add link t-dummy name t-dummy.100 type vlan id 100\n$ ip link add name t-nlmon type nlmon\n$ ip link set t-nlmon master team0\n$ ip link set t-nlmon nomaster\n$ ip link set t-dummy up\n$ ip link set team0 up\n$ ip link set t-dummy.100 down\n$ ip link set t-dummy.100 master team0\n\nWhen enslave a vlan device to team device and team device type is changed\nfrom non-ether to ether, header_ops of team device is changed to\nvlan_header_ops. That is incorrect and will trigger null-ptr-deref\nfor vlan->real_dev in vlan_dev_hard_header() because team device is not\na vlan device.\n\nCache eth_header_ops in team_setup(), then assign cached header_ops to\nheader_ops of team net device when its type is changed from non-ether\nto ether to fix the bug.\n\n## Affected\n\n- `linux_kernel >= 3.7, < 4.14.327`\n- `linux_kernel >= 4.15, < 4.19.296`\n- `linux_kernel >= 4.20, < 5.4.258`\n- `linux_kernel >= 5.5, < 5.10.198`\n- `linux_kernel >= 5.11, < 5.15.134`\n- `linux_kernel >= 5.16, < 6.1.56`\n- `linux_kernel >= 6.2, < 6.5.6`\n- `linux_kernel = 6.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.6`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}