ipv4: account for fraggap on the paged allocation path (Linux Linux)

CVE-2026-53366
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.17 % · centile 6 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic.

Faiblesses (CWE)

  • CWE-131 — Calcul incorrect de la taille d'un tampon

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)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 8eb77cc73977d88787b37c92831b1c242e035396 < 5c6375bced6147ec2e460ee3b653f4860d5ecdc2 ; affected 8eb77cc73977d88787b37c92831b1c242e035396 < ce494707a9c07f27c219ca67f3e138061f53d9b3 ; affected 8eb77cc73977d88787b37c92831b1c242e035396 < a9c24eda24bd15f432e37824e6fc440977cb241c ; affected 8eb77cc73977d88787b37c92831b1c242e035396 < 77798d7be6ef71e72fb6fc8a2901bf74ebc9706f ; affected 8eb77cc73977d88787b37c92831b1c242e035396 < c04d9ece23deb9e26c19f9ca215e98b3295aa1bb ; affected 8eb77cc73977d88787b37c92831b1c242e035396 < eca856950f7cb1a221e02b99d758409f2c5cec42
Linux · Linuxaffected 6.0 ; unaffected 0 < 6.0 ; unaffected 6.1.178 ≤ 6.1.* ; unaffected 6.6.144 ≤ 6.6.* ; unaffected 6.12.95 ≤ 6.12.* ; unaffected 6.18.38 ≤ 6.18.*

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