cbcvebase.
CVE-2024-56638
published 2024-12-27

CVE-2024-56638: In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: incorrect percpu area handling under softirq Softirq can interrupt…

PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.23%
13.5th percentile
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: incorrect percpu area handling under softirq Softirq can interrupt ongoing packet from process context that is walking over the percpu area that contains inner header offsets. Disable bh and perform three checks before restoring the percpu inner header offsets to validate that the percpu area is valid for this skbuff: 1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff has already been parsed before for inner header fetching to register. 2) Validate that the percpu area refers to this skbuff using the skbuff pointer as a cookie. If there is a cookie mismatch, then this skbuff needs to be parsed again. 3) Finally, validate if the percpu area refers to this tunnel type. Only after these three checks the percpu area is restored to a on-stack copy and bh is enabled again. After inner header fetching, the on-stack copy is stored back to the percpu area.

Affected

11 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.12.5-1 (forky)linux 6.12.5-1 (forky)
linuxlinux
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < 53c7314208c865086d78b4e88da53bc33da0b60353c7314208c865086d78b4e88da53bc33da0b603
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < da5cc778e7bf78fe525bc90ec2043f41415c31d9da5cc778e7bf78fe525bc90ec2043f41415c31d9
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < 7b1d83da254be3bf054965c8f3b1ad976f460ae57b1d83da254be3bf054965c8f3b1ad976f460ae5
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.12.5-16.12.5-1
linuxlinux_kernel>= 0 < 6.12.5-16.12.5-1
linuxlinux_kernel>= 0 < 6.8.0-58.606.8.0-58.60
linuxlinux_kernel>= 6.2 < 6.6.666.6.66
linuxlinux_kernel>= 6.7 < 6.12.56.12.5

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.8LOW
vendor_redhat7.8HIGH
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