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CVE-2026-43123— fbcon: check return value of con2fb_acquire_newinfo()

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fbcon中未检查con2fb_acquire_newinfo返回值，可能导致空指针取消引用。

AI Predicted 5.6 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< d3e535533767c85788529e626478718b7e95a59f affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< 3b5a754ec86bc6064af9aca76eb191c2405e6b0c affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< a785c4e2a999c2d51dfcf40d317cfb30cc735d2c affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< 0b038c0be6827dd2dbb1ce4f8d92d97c80cbe9cc affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< 11a93180a70bb3095a9bd80d113d9277e30d9959 affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< f57b61624c86ef8f87f6e6b7dd0755de03d90e89 affected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e< 011a0502801c8536f64141a2b61362c14f456544 affected
2.6.23 affected
… +8 more rows
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I. Basic Information for CVE-2026-43123

Vulnerability Information
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Vulnerability Title
fbcon: check return value of con2fb_acquire_newinfo()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fbcon: check return value of con2fb_acquire_newinfo() If fbcon_open() fails when called from con2fb_acquire_newinfo() then info->fbcon_par pointer remains NULL which is later dereferenced. Add check for return value of the function con2fb_acquire_newinfo() to avoid it. Found by Linux Verification Center (linuxtesting.org) with SVACE.
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fbcon中未检查con2fb_acquire_newinfo返回值，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 d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e ~ d3e535533767c85788529e626478718b7e95a59f -
Linux Linux 2.6.23 -

II. Public POCs for CVE-2026-43123

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III. Intelligence Information for CVE-2026-43123

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Patches & Fixes for CVE-2026-43123 (7)

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-2026-43117 9.1 CRITICAL btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43239 8.8 HIGH smb: client: prevent races in ->query_interfaces()
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43215 8.8 HIGH cifs: Fix locking usage for tcon fields

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-2026-43123

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