high 7.8

CVE-2026-46263 json

drm/amd/display: Fix out-of-bounds stream encoder index v3

published 2026-06-03 5 mo ago modified 2026-10-19 20 d ago also EUVD-2026-34125

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

In the Linux kernel, the following vulnerability has been resolved:

eng_id can be negative and that stream_enc_regs[] can be indexed out of bounds.

eng_id is used directly as an index into stream_enc_regs[], which has only 5 entries. When eng_id is 5 (ENGINE_ID_DIGF) or negative, this can access memory past the end of the array.

Add a bounds check using ARRAY_SIZE() before using eng_id as an index. The unsigned cast also rejects negative values.

This avoids out-of-bounds access.

Fixes the below smatch error: dcn*_resource.c: stream_encoder_create() may index stream_enc_regs[eng_id] out of bounds (size 5).

drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn351/dcn351_resource.c 1246 static struct stream_encoder *dcn35_stream_encoder_create( 1247 enum engine_id eng_id, 1248 struct dc_context *ctx) 1249 {

...

1255 1256 /* Mapping of VPG, AFMT, DME register blocks to DIO block instance */ 1257 if (eng_id <= ENGINE_ID_DIGF) {

ENGINE_ID_DIGF is 5. should <= be <?

Unrelated but, ugh, why is Smatch saying that "eng_id" can be negative? end_id is type signed long, but there are checks in the caller which prevent it from being negative.

1258 vpg_inst = eng_id; 1259 afmt_inst = eng_id; 1260 } else 1261 return NULL; 1262

...

1281 1282 dcn35_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios, 1283 eng_id, vpg, afmt, --> 1284 &stream_enc_regs[eng_id], ^^^^^^^^^^^^^^^^^^^^^^^ This stream_enc_regs[] array has 5 elements so we are one element beyond the end of the array.

...

1287 return &enc1->base; 1288 }

v2: use explicit bounds check as suggested by Roman/Dan; avoid unsigned int cast

v3: The compiler already knows how to compare the two values, so the cast (int) is not needed. (Roman)

Patch / fix

fixed in 1 distros 3 links 4

Linux Linux 6.12.75, 6.18.14, 6.19.4, 7.0

debian suse opensuse

linux Debian 13 6.12.85-1
linux Debian 14 6.18.14-1

debian advisories DEBIAN-CVE-2026-46263

kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.37.1
kernel-rt Linux Micro 6.2 6.12.0-160000.37.1
kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1.160000.2.19
kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
kernel-azure SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1
kernel-obs-qa SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1

suse advisories SUSE-SU-2026:23237-1 SUSE-SU-2026:23068-1 SUSE-SU-2026:23221-1 SUSE-SU-2026:23231-1 SUSE-SU-2026:23066-1 SUSE-SU-2026:3166-1

kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-46263 updated 2026-11-05 cvss 5.5

kernel: drm/amd/display: Fix out-of-bounds stream encoder index v3

Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more Red Hat Enterprise Linux 10 kernel
affected: workaround, no fix available “Fix deferred”
Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-selftests-internal
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 23 d ago (2026-10-16)

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Linux

Classification

Weakness

CWE-125 Out-of-bounds Read

Technology feeds

Linux kernel rss critical rss

References

Sources

CVE List CVE-2026-46263
NVD CVE-2026-46263

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary