CVE-2026-76642: falha de alta gravidade em util-linux
util-linux libmount Privilege Escalation via Failed Mount Helper
Publicada em
Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.
21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.5epss 0.2%
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Produtos afetados
util-linux · util-linuxCVEs relacionadas — util-linux
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Referências
https://github.com/util-linux/util-linuxhttps://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L476https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L892https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411ahttps://github.com/util-linux/util-linux/commit/a15c00a9e545aa8b9cf6ec0f888ff6c7b3eaeedchttps://github.com/util-linux/util-linux/commit/f57cea130839c0af8dc0525274267ae4cfd66bbfhttps://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26fhttps://www.vulncheck.com/advisories/util-linux-libmount-privilege-escalation-via-failed-mount-helper