fbcon: fix NULL pointer dereference for a console without vc_data
Summary
| CVE | CVE-2026-74424 |
|---|
| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-08-15 06:22:44 UTC |
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| Updated | 2026-08-15 06:22:44 UTC |
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| Description | In the Linux kernel, the following vulnerability has been resolved:
fbcon: fix NULL pointer dereference for a console without vc_data
fbcon_new_modelist() runs when a framebuffer's modelist changes. For each
console mapped to it with fb_display[i].mode set, it reads vc_cons[i].d and
passes the vc_num to fbcon_set_disp(). This assumes a console with a mode
set has a vc_data, but it can be NULL. fbcon_set_disp() sets
fb_display[i].mode before it checks vc_data, and fbcon_deinit() leaves the
mode set after the vc_data is freed. fbcon_new_modelist() then dereferences
the NULL vc_data.
Keep fb_display[i].mode set only while the console has a vc_data. Check
vc_data before setting the mode in fbcon_set_disp(), and clear the mode in
fbcon_deinit(). The existing mode check in fbcon_new_modelist() then skips
such consoles. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 8e9b8b008f4036df0318870c5d754134ff1b94cc git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 cc4382dc5134826a3936a6b08de17f7dc7abe232 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 9b783b7e03dc78ec102edf618259a2b55911fc6a git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ac970358c5ca0775841bd2a56ce15dc464b99003 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6617df8c246311c82cebf061a4cee55b9df60922 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 b134ad2f7c06b3c1098dcc95008e2045ff4b49b2 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 5fae9a928482d4845bca169a3a098789203a1ca4 git |
Not specified |
| CNA |
Linux |
Linux |
affected 5.15.212 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.1.178 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6.145 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.97 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.18.40 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 7.1.5 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.212 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.178 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.145 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.97 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.40 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.1.5 7.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.