fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()
In the Linux kernel, the following vulnerability has been resolved: fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font() When fbcon_do_set_font() fails (e.g., due to a memory allocation failure inside vc_resize() under heavy memory pressure), it jumps to the `err_out` label to roll back the console state. However, the current rollback logic forgets to restore the `hi_font` state, leading to a severe state machine corruption. Earlier in the function, `set_vc_hi_font()` might be called to change `vc->vc_hi_font_mask` and mutate the screen buffer. If `vc_resize()` subsequently fails, the `err_out` path restores `vc_font.charcount` but entirely skips rolling back the `vc_hi_font_mask` and the screen buffer. This mismatch leaves the terminal in a desynchronized state. Because `vc_hi_font_mask` remains set, the VT subsystem will still accept character indices greater than 255 from userspace and write them to the screen buffer. Subsequent rendering calls (e.g., `fbcon_putcs()`) will then use these inflated indices to access the reverted, 256-character font array, leading to a deterministic out-of-bounds read and potential kernel memory disclosure. Fix this by adding the missing rollback logic for the `hi_font` mask and screen buffer in the error path.
- Published
- Jul 19, 2026
- Updated
- Aug 17, 2026
- EPSS
- 0.1% · 3th percentile
- CWE
- CWE-125
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.10.249 and later · before 5.10.261
- linux linux kernel5.15.64 and later · before 5.15.212
- linux linux kernel5.19.6 and later · before 6.0
- linux linux kernel6.0.1 and later · before 6.1.178
- linux linux kernel6.2 and later · before 6.6.145
- linux linux kernel6.7 and later · before 6.12.96
- linux linux kernel6.13 and later · before 6.18.39
- linux linux kernel6.19 and later · before 7.1.3
- linux linux kernel6.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- f08ccb792d3eaf1dc62d8cbf6a30d6522329f660, 6.0affected
- 868749a7456dc48e93887a8474194e2ee6d6c21f and later · before cb016bcb40c81e7b19c4ae6143babb366dae8e20affected · git
- ebd6f886aa2447fcfcdce5450c9e1028e1d681bb and later · before ac562193c36696513ae196171892e9338475c4bcaffected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before 3618a4c5b2591cfa83efe74f5b18c2d02b35c3f5affected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before a7a526fbc847f07ad3a503c7382189be5ab68574affected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before b5bb2c696e140c399cb874def2feedf61dee27d6affected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before 076b1aa65f77a49bce5a48a4a55a397cfcafa2b8affected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before 39815715cbcfabb16fc8c5f4a23deeda20f5df62affected · git
- a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 and later · before 8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2affected · git
- 5.10.249 and later · before 5.10.261affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.180-1 | 6.1.180-1 |
| Debian:12 | linux-6.12 | before 6.12.100-1~deb12u1 | 6.12.100-1~deb12u1 |
| Debian:13 | linux | before 6.12.96-1 | 6.12.96-1 |
| Debian:14 | linux | before 7.1.3-1 | 7.1.3-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 076b1aa65f77a49bce5a48a4a55a397cfcafa2b8 | Vendor (CNA) |
| Linux Linux | 3618a4c5b2591cfa83efe74f5b18c2d02b35c3f5 | Vendor (CNA) |
| Linux Linux | 39815715cbcfabb16fc8c5f4a23deeda20f5df62 | Vendor (CNA) |
| Linux Linux | 5.10.261 | Vendor (CNA) |
| Linux Linux | 5.15.212 | Vendor (CNA) |
| Linux Linux | 5.20 | Vendor (CNA) |
| Linux Linux | 8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2 | Vendor (CNA) |
| Linux Linux | a7a526fbc847f07ad3a503c7382189be5ab68574 | Vendor (CNA) |
| Linux Linux | ac562193c36696513ae196171892e9338475c4bc | Vendor (CNA) |
| Linux Linux | b5bb2c696e140c399cb874def2feedf61dee27d6 | Vendor (CNA) |
| Linux Linux | cb016bcb40c81e7b19c4ae6143babb366dae8e20 | Vendor (CNA) |
| azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 | 6.6.145.2-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.180-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.100-1~deb12u1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0576 · Jul 20, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/076b1aa65f77a49bce5a48a4a55a397cfcafa2b8
- git.kernel.org/stable/c/3618a4c5b2591cfa83efe74f5b18c2d02b35c3f5
- git.kernel.org/stable/c/39815715cbcfabb16fc8c5f4a23deeda20f5df62
- git.kernel.org/stable/c/8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2
- git.kernel.org/stable/c/a7a526fbc847f07ad3a503c7382189be5ab68574
- git.kernel.org/stable/c/ac562193c36696513ae196171892e9338475c4bc
- git.kernel.org/stable/c/b5bb2c696e140c399cb874def2feedf61dee27d6
- git.kernel.org/stable/c/cb016bcb40c81e7b19c4ae6143babb366dae8e20
Vendor advisories and official records. Exploit/PoC links are deliberately left out.