{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68420", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.392Z", "datePublished": "2026-08-10T12:04:40.933Z", "dateUpdated": "2026-08-10T12:04:40.933Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-10T12:04:40.933Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: reject optional IPTFS templates in outbound policies\n\nsyzbot reported a stack-out-of-bounds read in xfrm_state_find()\nwhich flows from xfrm_tmpl_resolve_one().\n\nCommit 3d776e31c841 (\"xfrm: Reject optional tunnel/BEET mode\ntemplates in outbound policies\") disallowed optional tunnel and\nBEET in outbound policies to prevent this. Later when IPTFS\nadded, it was not covered by that fix and can still trigger\nthe out-of-bounds read;\n\nExtend the check to disallow optional IPTFS in outbound policies\nas well. IPTFS should be identical to tunnel mode.\nIN and FWD policies are not affected: xfrm_tmpl_resolve_one()\nis only reachable via the outbound path.\n\nReproducer, before:\n\nip link add dummy0 type dummy\nip link set dummy0 up\nip addr add 10.1.1.1/24 dev dummy0\nip xfrm policy add src 10.1.1.1/32 dst 10.1.1.2/32 dir out tmpl\n src fc00::dead:1 dst fc00::dead:2 proto esp reqid 1 mode iptfs\n level use tmpl src fc00::dead:1 dst fc00::dead:2 proto esp reqid\n 2 mode transport\nping -W 1 -c 1 10.1.1.2\nPING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.\n\n[ 64.168420] ==================================================================\n[ 64.169977] BUG: KASAN: stack-out-of-bounds in __xfrm6_addr_hash+0x11e/0x170\n[ 64.169977] Read of size 4 at addr ffff88800e1ffd20 by task ping/2844\n\n[ 64.169977] CPU: 2 UID: 0 PID: 2844 Comm: ping Not tainted 7.1.0-rc7-00180-geb23b588430a #98 PREEMPT(full)\n[ 64.169977] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 64.169977] Call Trace:\n[ 64.169977] <TASK>\n[ 64.169977] dump_stack_lvl+0x47/0x70\n[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170\n[ 64.169977] print_report+0x152/0x4b0\n[ 64.169977] ? ksys_mmap_pgoff+0x6d/0xa0\n[ 64.169977] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 64.169977] ? rcu_read_unlock_sched+0xa/0x20\n[ 64.169977] ? __virt_addr_valid+0x21b/0x230\n[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170\n[ 64.169977] kasan_report+0xa8/0xd0\n[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170\n[ 64.169977] __xfrm6_addr_hash+0x11e/0x170\n[ 64.169977] __xfrm_dst_hash+0x24/0xc0\n[ 64.169977] xfrm_state_find+0xa2d/0x2f90\n[ 64.169977] ? __pfx_xfrm_state_find+0x10/0x10\n[ 64.169977] ? __pfx_ftrace_graph_ret_addr+0x10/0x10\n[ 64.169977] ? __pfx_ftrace_graph_ret_addr+0x10/0x10\n[ 64.169977] xfrm_tmpl_resolve_one+0x210/0x570\n[ 64.169977] ? __pfx_xfrm_tmpl_resolve_one+0x10/0x10\n[ 64.169977] ? __pfx_stack_trace_consume_entry+0x10/0x10\n[ 64.169977] ? kernel_text_address+0x5b/0x80\n[ 64.169977] ? __kernel_text_address+0xe/0x30\n[ 64.169977] ? unwind_get_return_address+0x5e/0x90\n[ 64.169977] ? arch_stack_walk+0x8c/0xe0\n[ 64.169977] xfrm_tmpl_resolve+0x130/0x200\n[ 64.169977] ? __pfx_xfrm_tmpl_resolve+0x10/0x10\n[ 64.169977] ? __pfx_xfrm_policy_inexact_lookup_rcu+0x10/0x10\n[ 64.169977] ? __refcount_add_not_zero.constprop.0+0xb2/0x110\n[ 64.169977] ? __pfx___refcount_add_not_zero.constprop.0+0x10/0x10\n[ 64.169977] xfrm_resolve_and_create_bundle+0xd5/0x310\n[ 64.169977] ? __pfx_xfrm_resolve_and_create_bundle+0x10/0x10\n[ 64.169977] ? __pfx_xfrm_policy_lookup_bytype+0x10/0x10\n[ 64.169977] ? __pfx_xfrm_policy_lookup_bytype+0x10/0x10\n[ 64.169977] xfrm_lookup_with_ifid+0x3d8/0xb80\n[ 64.169977] ? __pfx_xfrm_lookup_with_ifid+0x10/0x10\n[ 64.169977] ? ip_route_output_key_hash+0xc6/0x110\n[ 64.169977] ? kasan_save_track+0x10/0x30\n[ 64.169977] xfrm_lookup_route+0x18/0xe0\n[ 64.169977] ip4_datagram_release_cb+0x4c9/0x530\n[ 64.169977] ? __pfx_ip4_datagram_release_cb+0x10/0x10\n[ 64.169977] ? do_raw_spin_lock+0x71/0xc0\n[ 64.169977] ? __pfx_do_raw_spin_lock+0x10/0x10\n[ 64.169977] release_sock+0xb0/0x170\n[ 64.169977] udp_connect+0x43/0x50\n[ 64.169977] __sys_connect+0xa6/0x100\n[ 64.169977] ? alloc_fd+0x2e9/0x300\n[ 64.169977] ? __pfx___sys_connect+0x10/0x10\n[ 64.169977] ? preempt_latency\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_user.c"], "versions": [{"version": "d1716d5a44c37e5743bf6ea4e5cdbdab37727f27", "lessThan": "d7fc6f351c478586980a521d63b0214d9c055e78", "status": "affected", "versionType": "git"}, {"version": "d1716d5a44c37e5743bf6ea4e5cdbdab37727f27", "lessThan": "9333f4b6f44858fc98eb12bf26b8d2959eb975d5", "status": "affected", "versionType": "git"}, {"version": "d1716d5a44c37e5743bf6ea4e5cdbdab37727f27", "lessThan": "ea528f18231ec0f33317be57f8866913b19aba6e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_user.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2-rc4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d7fc6f351c478586980a521d63b0214d9c055e78"}, {"url": "https://git.kernel.org/stable/c/9333f4b6f44858fc98eb12bf26b8d2959eb975d5"}, {"url": "https://git.kernel.org/stable/c/ea528f18231ec0f33317be57f8866913b19aba6e"}], "title": "xfrm: reject optional IPTFS templates in outbound policies", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{}

{"created": "2026-08-10T16:00:04.015909+00:00", "updated": "2026-08-10T16:00:04.015915+00:00", "vendors": [], "weaknesses": ["CWE-125"]}