{"id":"CVE-2026-98372","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk()\n\niptfs_skb_reset_frag_walk() advances to the fragment containing @offset\nwith an unbounded loop:\n\n\twhile …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk()\n\niptfs_skb_reset_frag_walk() advances to the fragment containing @offset\nwith an unbounded loop:\n\n\twhile …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 < 7e1c6884a0b494b7e3f204877f94c1e07a117bf7","Linux >= 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 < da56d0ee93d1bad779b0486f2fab92d1bc1f0cf3","Linux >= 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 < d042487dc118e494db2e2c1382310255c90ff544","Linux 6.14"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:31.743","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98372","references":[{"url":"https://git.kernel.org/stable/c/7e1c6884a0b494b7e3f204877f94c1e07a117bf7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d042487dc118e494db2e2c1382310255c90ff544","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da56d0ee93d1bad779b0486f2fab92d1bc1f0cf3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-06T08:50:17.389Z","slug":"CVE-2026-98372","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk()\n\niptfs_skb_reset_frag_walk() advances to the fragment containing @offset\nwith an unbounded loop:\n\n\twhile (offset >= walk->past + walk->frags[walk->fragi].len)\n\t\twalk->past += walk->frags[walk->fragi++].len;\n\nwalk->fragi is advanced and walk->frags[walk->fragi] is dereferenced\nwithout ever checking fragi against walk->nr_frags. When the requested\noffset is at or beyond the total length spanned by the walk's fragments,\nfragi runs past nr_frags and off the end of the fixed-size on-stack\nfrags[MAX_SKB_FRAGS + 1] array, reading out-of-bounds stack memory.\n\nThe two callers behave differently: iptfs_skb_add_frags() already guards\nagainst this with\n\n\tif (!walk->nr_frags ||\n\t    offset >= walk->total + walk->initial_offset)\n\t\treturn len;\n\nbut iptfs_skb_can_add_frags() has no such guard and calls\niptfs_skb_reset_frag_walk() unconditionally, so it performs the\nout-of-range walk. Its own \"fragi < walk->nr_frags\" bound check runs only\nafterwards, too late to prevent the read.\n\nThis is reachable from the receive path: a crafted IP-TFS (AGGFRAG)\npayload delivered to an IPTFS SA drives iptfs_reassem_cont() ->\niptfs_skb_can_add_frags() with an offset past the fragment total, e.g.:\n\n  BUG: KASAN: stack-out-of-bounds in iptfs_skb_reset_frag_walk+0x235/0x250\n  Read of size 4 at addr ffff888008ad7210 by task repro/345\n   iptfs_skb_reset_frag_walk+0x235/0x250 net/xfrm/xfrm_iptfs.c:392\n   iptfs_skb_can_add_frags+0x155/0x310  net/xfrm/xfrm_iptfs.c:420\n   iptfs_reassem_cont+0xcf8/0x1140      net/xfrm/xfrm_iptfs.c:902\n   iptfs_input_ordered+0x552/0x670      net/xfrm/xfrm_iptfs.c:1280\n   iptfs_input+0x3d6/0xde0              net/xfrm/xfrm_iptfs.c:1741\n   xfrm_input+0x282f/0x6140             net/xfrm/xfrm_input.c:700\n   xfrm4_esp_rcv+0x93/0x120             net/ipv4/xfrm4_protocol.c:104\n   ip_rcv+0x278/0x2d0                   net/ipv4/ip_input.c:612\n\nGive iptfs_skb_can_add_frags() the same up-front guard that\niptfs_skb_add_frags() already has, so the walk is never entered with an\nout-of-range offset. When it triggers, the caller falls back to the\nexisting linearize-and-copy path, which is safe.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}