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CVE Record

CVE-2022-49728: ipv6: Fix signed integer overflow in __ip6_append_data

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix signed integer overflow in __ip6_append_data Resurrect ubsan overflow checks and ubsan report this warning, fix it by change the variable [length] type to size_t. UBSAN: signed-integer-overflow in net/ipv6/ip6_output.c:1489:19 2147479552 + 8567 cannot be represented in type 'int' CPU: 0 PID: 253 Comm: err Not tainted 5.16.0+ #1 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x214/0x230 show_stack+0x30/0x78 dump_stack_lvl+0xf8/0x118 dump_stack+0x18/0x30 ubsan_epilogue+0x18/0x60 handle_overflow+0xd0/0xf0 __ubsan_handle_add_overflow+0x34/0x44 __ip6_append_data.isra.48+0x1598/0x1688 ip6_append_data+0x128/0x260 udpv6_sendmsg+0x680/0xdd0 inet6_sendmsg+0x54/0x90 sock_sendmsg+0x70/0x88 ____sys_sendmsg+0xe8/0x368 ___sys_sendmsg+0x98/0xe0 __sys_sendmmsg+0xf4/0x3b8 __arm64_sys_sendmmsg+0x34/0x48 invoke_syscall+0x64/0x160 el0_svc_common.constprop.4+0x124/0x300 do_el0_svc+0x44/0xc8 el0_svc+0x3c/0x1e8 el0t_64_sync_handler+0x88/0xb0 el0t_64_sync+0x16c/0x170 Changes since v1: -Change the variable [length] type to unsigned, as Eric Dumazet suggested. Changes since v2: -Don't change exthdrlen type in ip6_make_skb, as Paolo Abeni suggested. Changes since v3: -Don't change ulen type in udpv6_sendmsg and l2tp_ip6_sendmsg, as Jakub Kicinski suggested.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-49728 is a Linux kernel IPv6 bug where a length calculation can overflow a signed integer. The public record shows a kernel fix, but does not provide CVSS, confirmed exploitation, or a complete business-impact statement. Treat it as a kernel maintenance risk requiring timely patch validation.

Executive priority

Schedule this into the next kernel patch cycle unless local kernel exposure is broad or patch windows are overdue. Escalate if critical internet-facing Linux infrastructure depends heavily on IPv6 and cannot be patched promptly.

Technical view

The issue is in __ip6_append_data in net/ipv6/ip6_output.c. UBSAN reported signed integer overflow during the IPv6 UDP send path. The fix changes the length variable type to avoid signed overflow. Public sources list affected Linux kernel ranges and stable kernel commits.

Likely exposure

Exposure is likely on Linux systems running affected kernel versions with IPv6 networking paths present. The bundle lists Linux kernels from 2.6.12 through several later branches as affected, with fixed stable references. Distribution backports may change version-only conclusions.

Exploitation context

No provided source states active exploitation, and KEV is false. The evidence shows a sanitizer-detected overflow and a userspace-to-kernel send path, but not a public exploit, reliable impact chain, or attacker prerequisites beyond kernel reachability.

Researcher notes

The source bundle lacks CVSS, CWE, exploitability assessment, and concrete impact beyond signed integer overflow. Validate with vendor backport metadata because distro kernels may contain the fix without matching upstream version numbers.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • For Debian LTS systems, review and apply the linked Debian security update.
  • Confirm production images use patched distro kernels, not only upstream version labels.
  • Prioritize reboot or live-patch completion where kernel updates require activation.

Validation and detection

  • Inventory running Linux kernel versions across servers, containers hosts, and appliances.
  • Map each kernel to vendor advisories or the referenced stable commits.
  • Check whether IPv6 networking is enabled on exposed Linux hosts.
  • Review kernel logs for matching UBSAN overflow messages if sanitizer builds are used.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2022-49728 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
6Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 5.10.236, 5.15.180, 5.18.6, 5.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.