CVE-2026-31407
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.17% probability · 7th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7dPatch
- https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56ePatch
- https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70
- https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443Patch
- https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe
- https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507cPatch
- https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c
- https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.