Out-of-bounds read in Linux kernel - CVE-2026-98372

Vulnerability details

The vulnerability allows a remote attacker to trigger an out-of-bounds read of kernel stack memory.

The vulnerability exists due to an out-of-bounds read in iptfs_skb_reset_frag_walk() when processing an IP-TFS payload with an offset at or beyond the total length of the fragment data. A remote attacker can send a crafted IP-TFS (AGGFRAG) payload to advance the fragment index beyond the fixed-size stack array to trigger an out-of-bounds read of kernel stack memory.

Exploitation requires delivery to an IP-TFS security association. The receive path reaches the vulnerable function through iptfs_reassem_cont() and iptfs_skb_can_add_frags().

Affected software

How to mitigate CVE-2026-98372

External References

• https://git.kernel.org/stable/c/7e1c6884a0b494b7e3f204877f94c1e07a117bf7
• https://git.kernel.org/stable/c/d042487dc118e494db2e2c1382310255c90ff544
• https://git.kernel.org/stable/c/da56d0ee93d1bad779b0486f2fab92d1bc1f0cf3

Related Security Bulletins

• Out-of-bounds read in Linux kernel xfrm
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more