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CVE-2026-43149— net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean()

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fsl_ucc_hdlc驱动在清理时错误地将连续分配的缓冲区作为两个独立缓冲区释放。

AI Predicted 5.5 Difficulty: Easy EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c19b6d246a35627c3a69b2fa6bdece212b48214b< 6496fb830cbb741d831225cc4e7e5601c6e42970 affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< ba8d8429e5d6c36f9a654d2b96b9e043c43d92b4 affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< 011ae5dd84dc9f05eb9b8e1adff44252ac776e7b affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< 0f85a9655445e67bb0238cfc983d7c383b54938e affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< 84b932bc9899d43e5829e6cf088b72d73a922b2b affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< d8a522085d09b30aba1016daf1dddac37c0f0285 affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< d68994e37ac3b285692559776e0279a88a3b5f8d affected
c19b6d246a35627c3a69b2fa6bdece212b48214b< 36bd7d5deef936c4e1e3cd341598140e5c14c1d3 affected
… +10 more rows
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I. Basic Information for CVE-2026-43149

Vulnerability Information
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Vulnerability Title
net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: wan/fsl_ucc_hdlc: Fix dma_free_coherent() in uhdlc_memclean() The priv->rx_buffer and priv->tx_buffer are alloc'd together as contiguous buffers in uhdlc_init() but freed as two buffers in uhdlc_memclean(). Change the cleanup to only call dma_free_coherent() once on the whole buffer.
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fsl_ucc_hdlc驱动在清理时错误地将连续分配的缓冲区作为两个独立缓冲区释放。
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 c19b6d246a35627c3a69b2fa6bdece212b48214b ~ 6496fb830cbb741d831225cc4e7e5601c6e42970 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-43149

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III. Intelligence Information for CVE-2026-43149

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Patches & Fixes for CVE-2026-43149 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-43208 9.8 CRITICAL net: do not pass flow_id to set_rps_cpu()
CVE-2026-43125 9.8 CRITICAL dlm: validate length in dlm_search_rsb_tree
CVE-2026-43198 9.8 CRITICAL tcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-43186 9.8 CRITICAL ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-43185 9.8 CRITICAL ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-43114 9.4 CRITICAL netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43117 9.1 CRITICAL btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43239 8.8 HIGH smb: client: prevent races in ->query_interfaces()
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43215 8.8 HIGH cifs: Fix locking usage for tcon fields
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43149

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