Answer in brief
CVE-2026-53403 records a Medium severity (CVSS 5.5) vulnerability in fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1458a4d804550b7101e8bb02c1cb941088e4c0c7 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8707f02ac9f5f632039b60df2c9f3dc914709f72 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0d8c7f21ad8529d5c181e61f86be35b887ae2e4d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7640b4f68acb54c2c4f6b4a8aee0e9849dacd929 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eea16b6f805c0b1fb2f72f0f771088ea45356956 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88913059c77e171f44ba829282d42dde0d458811 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f08fc10fa3d3366dc3af723970bd03d7d6d10e3 | 1458a4d804550b7101e8bb02c1cb941088e4c0c7, 8707f02ac9f5f632039b60df2c9f3dc914709f72, 0d8c7f21ad8529d5c181e61f86be35b887ae2e4d, 7640b4f68acb54c2c4f6b4a8aee0e9849dacd929, 4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e, eea16b6f805c0b1fb2f72f0f771088ea45356956, 88913059c77e171f44ba829282d42dde0d458811, 7f08fc10fa3d3366dc3af723970bd03d7d6d10e3 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var info->var, a framebuffer's current mode, is expected to have a matching entry in info->modelist. var_to_display() relies on this and treats a failed fb_match_mode() as "This should not happen". fb_set_var() keeps it true by adding the mode to the list on every change, and do_register_framebuffer() does the same at registration. store_modes() replaces the modelist from userspace. fb_new_modelist() validates the new modes but does not check that info->var still has a match. It relies on fbcon_new_modelist() to re-point consoles, but that only handles consoles mapped to the framebuffer. With fbcon unbound there are none, so info->var is left describing a mode that is no longer in the list. A later console takeover runs var_to_display(), where fb_match_mode() returns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it to display_to_var(), and fb_videomode_to_var() dereferences the NULL mode. Keep the current mode in the list in fb_new_modelist(), the same way fb_set_var() does.
Quoted source text, attributed separately from HOL analysis.