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CVE-2026-46191— fbcon: Avoid OOB font access if console rotation fails

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中控制台旋转失败时字体缓冲区未清理，导致打印高字符码时可能溢出字体缓冲区。

AI Predicted 4.7 Difficulty: Hard EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6cc50e1c5b57180fd37a31282000f43859b0fe73< b51c343a81e6e806525a4435e22532c107dd7e9d affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< 46cf3646dea54baeaa2eafe3fb1ba769947f31b0 affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< 524a6079395916fb3d790ef2bb46a1d2939b27dd affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< 594973a2e54924d8ba31c9faac669fc1ba6fcb80 affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< ab6c34b9829d5de03f1d08a47a2253729a6e7e27 affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< 7105d9f1387d63b15c9a860674fc92c959181f2f affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< b44cc78ff46b96e72d333a3be6aaaa0a14797263 affected
6cc50e1c5b57180fd37a31282000f43859b0fe73< e4ef723d8975a2694cc90733a6b888a5e2841842 affected
… +10 more rows
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I. Basic Information for CVE-2026-46191

Vulnerability Information
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Vulnerability Title
fbcon: Avoid OOB font access if console rotation fails
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if the reallocation during console rotation fails in fbcon_rotate_font(). The putcs implementations for the rotated buffer will return early in this case. See [1] for an example. Currently, fbcon_rotate_font() keeps the old buffer, which is too small for the rotated font. Printing to the rotated console with a high-enough character code will overflow the font buffer. v2: - fix typos in commit message
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中控制台旋转失败时字体缓冲区未清理，导致打印高字符码时可能溢出字体缓冲区。
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 6cc50e1c5b57180fd37a31282000f43859b0fe73 ~ b51c343a81e6e806525a4435e22532c107dd7e9d -
Linux Linux 2.6.15 -

II. Public POCs for CVE-2026-46191

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III. Intelligence Information for CVE-2026-46191

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Patches & Fixes for CVE-2026-46191 (7)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
CVE-2026-46210 7.8 HIGH media: iris: fix use-after-free of fmt_src during MBPF check
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46191

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