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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < 8e9b8b008f4036df0318870c5d754134ff1b94ccaffectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < cc4382dc5134826a3936a6b08de17f7dc7abe232affectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < 9b783b7e03dc78ec102edf618259a2b55911fc6aaffectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < ac970358c5ca0775841bd2a56ce15dc464b99003affectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < 6617df8c246311c82cebf061a4cee55b9df60922affectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < b134ad2f7c06b3c1098dcc95008e2045ff4b49b2affectedd1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e to < 5fae9a928482d4845bca169a3a098789203a1ca4affected
Linux Linux
Default version status: affected
2.6.23affected0 to < 2.6.23unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc ↗
- https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232 ↗
- https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a ↗
- https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003 ↗
- https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922 ↗
- https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2 ↗
- https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4 ↗