netfilter: nftables: exthdr: fix 4-byte stack OOB write
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.7%
exploitation probability
0.7%top 51% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nftables: exthdr: fix 4-byte stack OOB write
If priv->len is a multiple of 4, then dst[len / 4] can write past
the destination array which leads to stack corruption.
This construct is necessary to clean the remainder of the register
in case ->len is NOT a multiple of the register size, so make it
conditional just like nft_payload.c does.
The bug was added in 4.1 cycle and then copied/inherited when
tcp/sctp and ip option support was added.
Bug reported by Zero Day Initiative project (ZDI-CAN-21950,
ZDI-CAN-21951, ZDI-CAN-21961).
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/1ad7b189cc1411048434e8595ffcbe7873b71082https://git.kernel.org/stable/c/28a97c43c9e32f437ebb8d6126f9bb7f3ca9521ahttps://git.kernel.org/stable/c/a7d86a77c33ba1c357a7504341172cc1507f0698https://git.kernel.org/stable/c/c8f292322ff16b9a2272a67de396c09a50e09dcehttps://git.kernel.org/stable/c/cf39c4f77a773a547ac2bcf30ecdd303bb0c80cbhttps://git.kernel.org/stable/c/d9ebfc0f21377690837ebbd119e679243e0099cchttps://git.kernel.org/stable/c/fd94d9dadee58e09b49075240fe83423eb1dcd36https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html