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CVE-2026-53337— net: bonding: fix NULL pointer dereference in bond_do_ioctl()

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基金会开源的一款操作系统内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于在bond_do_ioctl()中，对从__dev_get_by_name()获取的slave_dev指针在空指针检查前被解引用，可能导致本地拒绝服务攻击。

AI Predicted 7.8 Difficulty: Easy EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e2a7420df2e01370b40e4cf7b85ab9a885c6d755< 1b7558c85493467b2ea20738866b822db6442034 affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< b02b2e3e876c18733b868a29064abd11cdbf8feb affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< 66693957bacd1c9dae6188a7312d6be69a221f2d affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< a629418d463fb50d132a1aa063b0105857311e5f affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< bcb8fad90f27300add583a8371db504b766d95c7 affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< b0878106ddc486375084145848ff255dedfff46a affected
e2a7420df2e01370b40e4cf7b85ab9a885c6d755< a764b0e8317a863006e05732e1aefe821b9d8c2d affected
… +10 more rows
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I. Basic Information for CVE-2026-53337

Vulnerability Information
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Vulnerability Title
net: bonding: fix NULL pointer dereference in bond_do_ioctl()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix NULL pointer dereference in bond_do_ioctl() In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which can return NULL if the requested interface name does not exist. However, the subsequent slave_dbg() call is placed before the NULL check: slave_dev = __dev_get_by_name(net, ifr->ifr_slave); slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here if (!slave_dev) return -ENODEV; The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ...) which unconditionally dereferences slave_dev->name before the NULL check is performed. This results in a NULL pointer dereference kernel oops when a user calls bonding ioctl (e.g. SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave interface name. This is reachable from userspace via the bonding ioctl interface with CAP_NET_ADMIN capability, making it a potential local denial-of-service vector. Fix by moving the slave_dbg() call after the NULL check.
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基金会开源的一款操作系统内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于在bond_do_ioctl()中，对从__dev_get_by_name()获取的slave_dev指针在空指针检查前被解引用，可能导致本地拒绝服务攻击。
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 e2a7420df2e01370b40e4cf7b85ab9a885c6d755 ~ 1b7558c85493467b2ea20738866b822db6442034 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-53337

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III. Intelligence Information for CVE-2026-53337

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Patches & Fixes for CVE-2026-53337 (8)

Same Patch Batch · Linux · 2026-07-01 · 31 CVEs total

CVE-2026-53355 9.8 CRITICAL net: rds: clear i_sends on setup unwind
CVE-2026-53354 8.8 HIGH arm64: errata: Mitigate TLBI errata on various Arm CPUs
CVE-2026-53356 7.8 HIGH drm/i915/gem: Fix phys BO pread/pwrite with offset
CVE-2026-53341 7.8 HIGH fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()
CVE-2026-53329 7.0 HIGH drm/amd/display: Use krealloc_array() in dal_vector_reserve()
CVE-2026-53342 arm64: mm: call pagetable dtor when freeing hot-removed page tables
CVE-2026-53353 hsr: Remove WARN_ONCE() in hsr_addr_is_self().
CVE-2026-53352 signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()
CVE-2026-53351 riscv/ptrace: Use USER_REGSET_NOTE_TYPE for REGSET_CFI
CVE-2026-53350 ASoC: wm_adsp: Fix NULL dereference when removing firmware controls
CVE-2026-53348 ASoC: SDCA: fix NULL pointer dereference in sdca_dev_unregister_functions
CVE-2026-53349 netfilter: nf_conntrack: destroy stale expectfn expectations on unregister
CVE-2026-53346 rust: arm64: set uwtable llvm module flag for CONFIG_UNWIND_TABLES
CVE-2026-53347 drm/virtio: Fix driver removal with disabled KMS
CVE-2026-53344 pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init
CVE-2026-53345 KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying
CVE-2026-53343 ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow
CVE-2026-53327 debugobjects: Do not fill_pool() if pi_blocked_on
CVE-2026-53340 i2c: imx: fix clock and pinctrl state inconsistency in runtime PM
CVE-2026-53339 i2c: qcom-cci: Fix NULL pointer dereference in cci_remove()

Showing top 20 of 31 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53337

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