KEV · Activement exploitée

CVE-2026-46300

CVE-2026-46300 est activement exploitée (catalogue CISA KEV) : sévérité high (CVSS 7.8), 0 apps suivies concernées, aucune encore exposée en version courante.

Gravité (CVSS): 7.8
Exploitation: Avérée
Apps suivies: 0
Encore exposées: 0

Exploit public : ExploitDB Publié le 2026-05-23

EN In the Linux kernel, the following vulnerability has been resolved:

net: skbuff: preserve shared-frag marker during coalescing

skb_try_coalesce() can attach paged frags from @from to @to. If @from
has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same
externally-owned or page-cache-backed frags, but the shared-frag marker
is currently lost.

That breaks the invariant relied on by later in-place writers. In
particular, ESP input checks skb_has_shared_frag() before deciding
whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP
receive coalescing has moved shared frags into an unmarked skb, ESP can
see skb_has_shared_frag() as false and decrypt in place over page-cache
backed frags.

Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged
frags. The tailroom copy path does not need the marker because it copies
bytes into @to's linear data rather than transferring frag descriptors.

Vecteur d'attaque : Local Sans interaction utilisateur

Voir le vecteur CVSS brut

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS 16.13% modèle prédictif ; la CISA constate une exploitation avérée percentile 96.9%

CISA Known Exploited Vulnerability

Ajouté au KEV: 2026-10-28
Deadline remédiation: 2026-10-31
Action requise: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware: Inconnu (non documenté par CISA)

Voir sur NVD ↗ Catalogue CISA KEV ↗ Advisory · git.kernel.org

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