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CVE-2024-40910— ax25: Fix refcount imbalance on inbound connections

CVSS 8.8 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 22

VendorProductVersion RangeStatus
LinuxLinux9fd75b66b8f68498454d685dc4ba13192ae069b0< f4df9d6c8d4e4c818252b0419c2165d66eabd4ebaffected
9fd75b66b8f68498454d685dc4ba13192ae069b0< 52100fd74ad07b53a4666feafff1cd11436362d3affected
9fd75b66b8f68498454d685dc4ba13192ae069b0< a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964affected
9fd75b66b8f68498454d685dc4ba13192ae069b0< 3c34fb0bd4a4237592c5ecb5b2e2531900c55774affected
c44a453ffe16eb08acdc6129ac4fa0192dbc0456affected
de55a1338e6a48ff1e41ea8db1432496fbe2a62baffected
9e1e088a57c23251f1cfe9601bbd90ade2ea73b9affected
b20a5ab0f5fb175750c6bafd4cf12daccf00c738affected
… +14 more rows
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I. Basic Information for CVE-2024-40910

Vulnerability Information
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Vulnerability Title
ax25: Fix refcount imbalance on inbound connections
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix refcount imbalance on inbound connections When releasing a socket in ax25_release(), we call netdev_put() to decrease the refcount on the associated ax.25 device. However, the execution path for accepting an incoming connection never calls netdev_hold(). This imbalance leads to refcount errors, and ultimately to kernel crashes. A typical call trace for the above situation will start with one of the following errors: refcount_t: decrement hit 0; leaking memory. refcount_t: underflow; use-after-free. And will then have a trace like: Call Trace: <TASK> ? show_regs+0x64/0x70 ? __warn+0x83/0x120 ? refcount_warn_saturate+0xb2/0x100 ? report_bug+0x158/0x190 ? prb_read_valid+0x20/0x30 ? handle_bug+0x3e/0x70 ? exc_invalid_op+0x1c/0x70 ? asm_exc_invalid_op+0x1f/0x30 ? refcount_warn_saturate+0xb2/0x100 ? refcount_warn_saturate+0xb2/0x100 ax25_release+0x2ad/0x360 __sock_release+0x35/0xa0 sock_close+0x19/0x20 [...] On reboot (or any attempt to remove the interface), the kernel gets stuck in an infinite loop: unregister_netdevice: waiting for ax0 to become free. Usage count = 0 This patch corrects these issues by ensuring that we call netdev_hold() and ax25_dev_hold() for new connections in ax25_accept(). This makes the logic leading to ax25_accept() match the logic for ax25_bind(): in both cases we increment the refcount, which is ultimately decremented in ax25_release().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 ax25 协议在处理传入连接时存在引用计数不平衡问题。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 9fd75b66b8f68498454d685dc4ba13192ae069b0 ~ f4df9d6c8d4e4c818252b0419c2165d66eabd4eb -
LinuxLinux 5.18 -

II. Public POCs for CVE-2024-40910

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III. Intelligence Information for CVE-2024-40910

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Other References for CVE-2024-40910 (4)

Same Patch Batch · Linux · 2024-07-12 · 122 CVEs total

CVE-2024-409999.8 CRITICALnet: ena: Add validation for completion descriptors consistency
CVE-2024-409079.8 CRITICALionic: fix kernel panic in XDP_TX action
CVE-2024-409239.8 CRITICALvmxnet3: disable rx data ring on dma allocation failure
CVE-2024-409839.8 CRITICALtipc: force a dst refcount before doing decryption
CVE-2024-409379.8 CRITICALgve: Clear napi->skb before dev_kfree_skb_any()
CVE-2024-409118.8 HIGHwifi: cfg80211: Lock wiphy in cfg80211_get_station
CVE-2024-409418.1 HIGHwifi: iwlwifi: mvm: don't read past the mfuart notifcation
CVE-2024-409537.9 HIGHKVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()
CVE-2024-409567.8 HIGHdmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list
CVE-2024-409187.8 HIGHparisc: Try to fix random segmentation faults in package builds
CVE-2024-409247.8 HIGHdrm/i915/dpt: Make DPT object unshrinkable
CVE-2024-409257.8 HIGHblock: fix request.queuelist usage in flush
CVE-2024-409437.8 HIGHocfs2: fix races between hole punching and AIO+DIO
CVE-2024-409477.8 HIGHima: Avoid blocking in RCU read-side critical section
CVE-2024-409497.8 HIGHmm: shmem: fix getting incorrect lruvec when replacing a shmem folio
CVE-2024-409907.8 HIGHRDMA/mlx5: Add check for srq max_sge attribute
CVE-2024-409867.8 HIGHdmaengine: xilinx: xdma: Fix data synchronisation in xdma_channel_isr()
CVE-2024-409897.8 HIGHKVM: arm64: Disassociate vcpus from redistributor region on teardown
CVE-2024-409847.8 HIGHACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."
CVE-2024-409917.8 HIGHdmaengine: ti: k3-udma-glue: Fix of_k3_udma_glue_parse_chn_by_id()

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-40910

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