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

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Summary

CVECVE-2023-52574
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-03-02 22:15:49 UTC
Updated2026-08-04 10:18:32 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a 1779eb51b9cc628cee551f252701a85a2a50a457 git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a a7fb47b9711101d2405b0eb1276fb1f9b9b270c7 git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a c5f6478686bb45f453031594ae19b6c9723a780d git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a b44dd92e2afd89eb6e9d27616858e72a67bdc1a7 git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a cd05eec2ee0cc396813a32ef675634e403748255 git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58 git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a cac50d9f5d876be32cb9aa21c74018468900284d git Not specified
CNA Linux Linux affected 1d76efe1577b4323609b1bcbfafa8b731eda071a 492032760127251e5540a5716a70996bacf2a3fd git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 4.14.327 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.296 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.258 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.198 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.134 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.56 6.1.* semver Not specified
CNA Linux Linux unaffected 6.5.6 6.5.* semver Not specified
CNA Linux Linux unaffected 6.6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 755966 SUSE Enterprise Linux Security Update for the linux kernel (SUSE-SU-2024:0857-1)
  • 755988 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0975-1)
  • 756004 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0926-1)
  • 756005 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0925-1)

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