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xfrm: esp: avoid in-place decrypt on shared skb frags (Linux Linux)

CVE-2026-43284
HIGH 8.8

En bref

Source
NVD
EPSS
EPSS 94.19 % · centile 100 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Rechercher sur…

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().

Faiblesses (CWE)

  • CWE-123 — Write-what-where Condition

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HCISA-ADP
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hredhat-SADP
CVSS 3.1HIGH 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < a6cb440f274a22456ef3e86b457344f1678f38f9 ; affected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < ab8b995323e5237041472d07e5055f5f7dcdf15b ; affected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < fe785bb3a8096dffcc4048a85cd0c83337eeecad ; affected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 5d55c7336f8032d434adcc5fab987ccc93a44aec ; affected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 8253aab4659ca16116b522203c2a6b18dccacea7 ; affected cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 50ed1e7873100f77abad20fd31c51029bc49cd03
Linux · Linuxaffected 4.11 ; unaffected 0 < 4.11 ; unaffected 5.10.255 ≤ 5.10.* ; unaffected 5.15.205 ≤ 5.15.* ; unaffected 5.15.206 ≤ 5.15.* ; unaffected 6.1.171 ≤ 6.1.*

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