CVE-2026-46191— fbcon: Avoid OOB font access if console rotation fails
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
II. Public POCs for CVE-2026-46191
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-46191 (7)
Same Patch Batch · Linux · 2026-05-28 · 136 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 136 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-64554
netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragm - CVE-2026-64555
KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops( - CVE-2026-64552
virtio-net: fix len check in receive_big() - CVE-2026-64553
net: psample: fix info leak in PSAMPLE_ATTR_DATA - CVE-2026-64551
sctp: validate STALE_COOKIE cause length before reading stal
Same vendor: Linux
- CVE-2026-64554
netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragm - CVE-2026-64555
KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops( - CVE-2026-64552
virtio-net: fix len check in receive_big() - CVE-2026-64553
net: psample: fix info leak in PSAMPLE_ATTR_DATA - CVE-2026-64551
sctp: validate STALE_COOKIE cause length before reading stal
V. Comments for CVE-2026-46191
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