media: stk1160: fix bounds checking in stk1160_copy_video() (Linux Linux)

CVE-2024-38621
HIGH 7.1

En bref

Source
NVD
EPSS
EPSS 0.28 % · centile 20 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: media: stk1160: fix bounds checking in stk1160_copy_video() The subtract in this condition is reversed. The ->length is the length of the buffer. The ->bytesused is how many bytes we have copied thus far. When the condition is reversed that means the result of the subtraction is always negative but since it's unsigned then the result is a very high positive value. That means the overflow check is never true. Additionally, the ->bytesused doesn't actually work for this purpose because we're not writing to "buf->mem + buf->bytesused". Instead, the math to calculate the destination where we are writing is a bit involved. You calculate the number of full lines already written, multiply by two, skip a line if necessary so that we start on an odd numbered line, and add the offset into the line. To fix this buffer overflow, just take the actual destination where we are writing, if the offset is already out of bounds print an error and return. Otherwise, write up to buf->length bytes.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
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 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < f6a392266276730bea893b55d12940e32a25f56a ; affected 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 ; affected 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 ; affected 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < 7532bcec0797adfa08791301c3bcae14141db3bd ; affected 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < b504518a397059e1d55c521ba0ea2b545a6c4b52 ; affected 9cb2173e6ea8f2948bd1367c93083a2500fcf08f < d410017a7181cb55e4a5c810b32b75e4416c6808
Linux · Linuxaffected 3.7 ; unaffected 0 < 3.7 ; unaffected 4.19.316 ≤ 4.19.* ; unaffected 5.4.278 ≤ 5.4.* ; unaffected 5.10.219 ≤ 5.10.* ; unaffected 5.15.161 ≤ 5.15.*

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