tty: Fix out-of-bound vmalloc access in imageblit (Linux Linux)

CVE-2021-47383
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.27 % · centile 18 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: tty: Fix out-of-bound vmalloc access in imageblit This issue happens when a userspace program does an ioctl FBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct containing only the fields xres, yres, and bits_per_pixel with values. If this struct is the same as the previous ioctl, the vc_resize() detects it and doesn't call the resize_screen(), leaving the fb_var_screeninfo incomplete. And this leads to the updatescrollmode() calculates a wrong value to fbcon_display->vrows, which makes the real_y() return a wrong value of y, and that value, eventually, causes the imageblit to access an out-of-bound address value. To solve this issue I made the resize_screen() be called even if the screen does not need any resizing, so it will "fix and fill" the fb_var_screeninfo independently.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7e71fcedfda6f7de18f850a6b36e78d78b04476f ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 70aed03b1d5a5df974f456cdc8eedb213c94bb8b ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 067c694d06040db6f0c65281bb358452ca6d85b9 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8a6a240f52e14356386030d8958ae8b1761d2325 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 883f7897a25e3ce14a7f274ca4c73f49ac84002a ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d570c48dd37dbe8fc6875d4461d01a9554ae2560
Linux · Linuxaffected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 4.4.286 ≤ 4.4.* ; unaffected 4.9.285 ≤ 4.9.* ; unaffected 4.14.249 ≤ 4.14.* ; unaffected 4.19.209 ≤ 4.19.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD