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CVE Record

CVE-2024-27396: net: gtp: Fix Use-After-Free in gtp_dellink

In the Linux kernel, the following vulnerability has been resolved: net: gtp: Fix Use-After-Free in gtp_dellink Since call_rcu, which is called in the hlist_for_each_entry_rcu traversal of gtp_dellink, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free. To prevent this, it should be changed to hlist_for_each_entry_safe.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux's GTP network-device removal code can access memory after it has been freed. Its CVSS score is 7.8 because a local, low-privileged attacker may cause serious confidentiality, integrity, and availability impact. It is not described as remotely exploitable, and the supplied sources provide no evidence of active attacks.

Executive priority

Patch promptly through the normal high-severity kernel process. Accelerate systems using GTP networking or permitting untrusted local users. This is not supported as an emergency internet-wide remote threat, but successful exploitation is scored for high impact across confidentiality, integrity, and availability.

Technical view

gtp_dellink traverses an RCU hlist while call_rcu occurs outside an RCU read-side critical section. A grace period may complete during traversal, freeing the current key and causing a use-after-free. The correction replaces hlist_for_each_entry_rcu with hlist_for_each_entry_safe. The vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Likely exposure

Exposure concerns Linux systems with a vulnerable kernel that can execute the GTP link-deletion path. Risk is narrower than a general internet-facing flaw because the attack vector is local. The supplied version data mixes releases and commit identifiers, so confirm exposure using distribution package status and backport information.

Exploitation context

The supplied record marks KEV false, and no cited source reports active exploitation. CVSS indicates local access, low privileges, low complexity, and no user interaction. The sources do not establish a remote attack path, public exploit availability, or observed attacks.

Researcher notes

The core race and source-level correction are clearly documented. Exposure precision is weaker: the supplied version section contains commit hashes, duplicated entries, and an anomalous “0” value. Treat distribution advisories and patched package builds as authoritative rather than relying only on upstream version comparisons. No exploitability details beyond CVSS are established.

Mitigation direction

  • Install a vendor-supported kernel containing the published stable correction.
  • Use distribution advisories or package changelogs to confirm the fix is backported.
  • Ensure the updated kernel is running after installation.
  • Consult the Linux distribution or appliance vendor when package status is unclear.

Validation and detection

  • Inventory running kernel releases and package builds across Linux systems.
  • Confirm vendor package status specifically references CVE-2024-27396 or the stable correction.
  • Identify systems that use Linux GTP networking and prioritize them.
  • Verify remediated systems are running the updated kernel.
  • Review kernel logs for GTP-related memory faults or crashes.
Prepared
Confidence
medium
Sources
12

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-2024-27396 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
3ADP providers
13Source 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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-27396Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
other:ssvc
CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux043a283d24f40fea4c8a8d06b0e2694c8e372200, c185e1d6e2752a4b656c3ca878c525fa11f55757, 94dc550a5062030569d4aa76e10e50c8fc001930, 94dc550a5062030569d4aa76e10e50c8fc001930, 94dc550a5062030569d4aa76e10e50c8fc001930, 94dc550a5062030569d4aa76e10e50c8fc001930, 94dc550a5062030569d4aa76e10e50c8fc001930, 94dc550a5062030569d4aa76e10e50c8fc001930, a29c4303930bc0c25ae6a4f365dcdef71447b4ea, 4.19.93, 5.4.8, 4.14.162unaffected
LinuxLinux5.5, 0, 4.19.313, 5.4.275, 5.10.216, 5.15.158, 6.1.90, 6.6.30, 6.8.9, 6.9affected
Weakness

CWE details

No CWE listed

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