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CVE-2026-23206— dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dpaa2-switch驱动在num_ifs为零时未做检查，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Trivial EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 0b1b71370458860579831e77485883fcf2e8fbbe< 2fcccca88456b592bd668db13aa1d29ed257ca2b affected
0b1b71370458860579831e77485883fcf2e8fbbe< 80165ff16051448d6f840585ebe13f2400415df3 affected
0b1b71370458860579831e77485883fcf2e8fbbe< b97415c4362f739e25ec6f71012277086fabdf6f affected
0b1b71370458860579831e77485883fcf2e8fbbe< 4acc40db06ffd0fd92683505342b00c8a7394c60 affected
0b1b71370458860579831e77485883fcf2e8fbbe< 155eb99aff2920153bf21217ae29565fff81e6af affected
0b1b71370458860579831e77485883fcf2e8fbbe< ed48a84a72fefb20a82dd90a7caa7807e90c6f66 affected
5.13 affected
< 5.13 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-23206

Vulnerability Information
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Vulnerability Title
dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dpaa2-switch驱动在num_ifs为零时未做检查，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0b1b71370458860579831e77485883fcf2e8fbbe ~ 2fcccca88456b592bd668db13aa1d29ed257ca2b -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-23206

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III. Intelligence Information for CVE-2026-23206

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Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total

CVE-2025-71202 8.8 HIGH iommu/sva: invalidate stale IOTLB entries for kernel address space
CVE-2026-23193 8.8 HIGH scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()
CVE-2026-23172 8.4 HIGH net: wwan: t7xx: fix potential skb->frags overflow in RX path
CVE-2026-23209 7.8 HIGH macvlan: fix error recovery in macvlan_common_newlink()
CVE-2026-23169 7.8 HIGH mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()
CVE-2026-23171 7.8 HIGH bonding: fix use-after-free due to enslave fail after slave array update
CVE-2025-71221 7.8 HIGH dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()
CVE-2026-23178 7.8 HIGH HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()
CVE-2026-23184 7.8 HIGH binder: fix UAF in binder_netlink_report()
CVE-2026-23185 7.8 HIGH wifi: iwlwifi: mld: cancel mlo_scan_start_wk
CVE-2026-23191 7.8 HIGH ALSA: aloop: Fix racy access at PCM trigger
CVE-2026-23192 7.8 HIGH linkwatch: use __dev_put() in callers to prevent UAF
CVE-2026-23198 7.8 HIGH KVM: Don't clobber irqfd routing type when deassigning irqfd
CVE-2025-71204 7.5 HIGH smb/server: fix refcount leak in parse_durable_handle_context()
CVE-2026-23148 7.5 HIGH nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
CVE-2026-23139 7.5 HIGH netfilter: nf_conncount: update last_gc only when GC has been performed
CVE-2026-23136 7.5 HIGH libceph: reset sparse-read state in osd_fault()
CVE-2026-23161 7.3 HIGH mm/shmem, swap: fix race of truncate and swap entry split
CVE-2025-71201 7.1 HIGH netfs: Fix early read unlock of page with EOF in middle
CVE-2026-23204 7.1 HIGH net/sched: cls_u32: use skb_header_pointer_careful()

Showing top 20 of 108 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23206

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