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CVE Record

CVE-2022-49862: tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header

In the Linux kernel, the following vulnerability has been resolved: tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header This is a follow-up for commit 974cb0e3e7c9 ("tipc: fix uninit-value in tipc_nl_compat_name_table_dump") where it should have type casted sizeof(..) to int to work when TLV_GET_DATA_LEN() returns a negative value. syzbot reported a call trace because of it: BUG: KMSAN: uninit-value in ... tipc_nl_compat_name_table_dump+0x841/0xea0 net/tipc/netlink_compat.c:934 __tipc_nl_compat_dumpit+0xab2/0x1320 net/tipc/netlink_compat.c:238 tipc_nl_compat_dumpit+0x991/0xb50 net/tipc/netlink_compat.c:321 tipc_nl_compat_recv+0xb6e/0x1640 net/tipc/netlink_compat.c:1324 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x103f/0x1260 net/netlink/genetlink.c:792 netlink_rcv_skb+0x3a5/0x6c0 net/netlink/af_netlink.c:2501 genl_rcv+0x3c/0x50 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0xf3b/0x1270 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x1288/0x1440 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline]

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-49862 is a Linux kernel TIPC bug that can cause an availability impact when a low-privileged local user triggers a malformed netlink compatibility path. The record does not show data theft or integrity impact, and it is not listed as KEV exploited.

Executive priority

Schedule remediation in the normal kernel patch cycle, with higher priority for shared hosts or systems allowing untrusted local users. This is not currently evidenced as remotely exploitable or actively exploited, but it can affect system availability.

Technical view

The flaw is in tipc_nl_compat_name_table_dump_header, where a TLV length check failed to handle a negative TLV_GET_DATA_LEN result correctly. syzbot reported a KMSAN uninitialized-value trace in the TIPC netlink compatibility dump path. CVSS is 5.5: local, low complexity, low privileges, no user interaction, high availability impact.

Likely exposure

Exposure is mainly Linux systems running affected kernel builds with TIPC functionality present and reachable by a local low-privileged user. The source lists Linux kernel versions around 5.0 through 6.1 as affected, with stable kernel fix commits referenced.

Exploitation context

No provided source reports active exploitation, and KEV is false. The documented trigger context is local netlink interaction with the TIPC compatibility handler, reported by syzbot. Treat this as a local denial-of-service risk unless vendor advisories provide stronger evidence.

Researcher notes

The key issue is a signedness/type handling mistake in the TIPC TLV length check following an earlier fix. Evidence is limited to the CVE record, syzbot trace summary, CVSS metadata, and kernel stable commits; no exploit details or operational mitigations are provided.

Mitigation direction

  • Update to a Linux kernel package containing the referenced stable fixes.
  • Use distribution kernel advisories to confirm backported fixes for your exact build.
  • Prioritize shared, multi-user, and container-host systems where local users are less trusted.
  • If patching is delayed, ask the vendor for supported temporary controls.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and container hosts.
  • Check distribution changelogs for CVE-2022-49862 or the referenced stable commits.
  • Confirm whether TIPC is enabled or available on exposed local workloads.
  • Review local-user access assumptions on affected systems before assigning priority.
Prepared
Confidence
high
Sources
10

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

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cwe · low confidence lookup

CWE-908: Exact CWE lookup

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cve · low confidence lookup

CVE-2022-49862 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
1ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2022-49862Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux4c559fb7e111077b56f62ccf833a52d8169cde19, 2aae1723dea1235ffef183daf0694805297424f6, 2d5fc1d492d194aa2986c5a9d8a48a60e9143a72, 974cb0e3e7c963ced06c4e32c5b2884173fa5e01, 974cb0e3e7c963ced06c4e32c5b2884173fa5e01, 974cb0e3e7c963ced06c4e32c5b2884173fa5e01, 974cb0e3e7c963ced06c4e32c5b2884173fa5e01, 974cb0e3e7c963ced06c4e32c5b2884173fa5e01, c25352f9ad5dffb4de95069e67891e2aa2e99e50, 5486e8d46560ca2b4d86cbd7d3a66d9913b2ac65, 4.9.152, 4.14.95, 4.19.17, 4.4.172, 4.20.4unaffected
LinuxLinux5.0, 0, 4.9.334, 4.14.300, 4.19.267, 5.4.225, 5.10.155, 5.15.79, 6.0.9, 6.1affected
Weakness

CWE details

CWE-908

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CWE-908 · source CWE mapping

Use of Uninitialized Resource

Use of Uninitialized Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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