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CVE Record

CVE-2024-26754: gtp: fix use-after-free and null-ptr-deref in gtp_genl_dump_pdp()

In the Linux kernel, the following vulnerability has been resolved: gtp: fix use-after-free and null-ptr-deref in gtp_genl_dump_pdp() The gtp_net_ops pernet operations structure for the subsystem must be registered before registering the generic netlink family. Syzkaller hit 'general protection fault in gtp_genl_dump_pdp' bug: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 5826 Comm: gtp Not tainted 6.8.0-rc3-std-def-alt1 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-alt1 04/01/2014 RIP: 0010:gtp_genl_dump_pdp+0x1be/0x800 [gtp] Code: c6 89 c6 e8 64 e9 86 df 58 45 85 f6 0f 85 4e 04 00 00 e8 c5 ee 86 df 48 8b 54 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 de 05 00 00 48 8b 44 24 18 4c 8b 30 4c 39 f0 74 RSP: 0018:ffff888014107220 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88800fcda588 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f1be4eb05c0(0000) GS:ffff88806ce80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1be4e766cf CR3: 000000000c33e000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ? show_regs+0x90/0xa0 ? die_addr+0x50/0xd0 ? exc_general_protection+0x148/0x220 ? asm_exc_general_protection+0x22/0x30 ? gtp_genl_dump_pdp+0x1be/0x800 [gtp] ? __alloc_skb+0x1dd/0x350 ? __pfx___alloc_skb+0x10/0x10 genl_dumpit+0x11d/0x230 netlink_dump+0x5b9/0xce0 ? lockdep_hardirqs_on_prepare+0x253/0x430 ? __pfx_netlink_dump+0x10/0x10 ? kasan_save_track+0x10/0x40 ? __kasan_kmalloc+0x9b/0xa0 ? genl_start+0x675/0x970 __netlink_dump_start+0x6fc/0x9f0 genl_family_rcv_msg_dumpit+0x1bb/0x2d0 ? __pfx_genl_family_rcv_msg_dumpit+0x10/0x10 ? genl_op_from_small+0x2a/0x440 ? cap_capable+0x1d0/0x240 ? __pfx_genl_start+0x10/0x10 ? __pfx_genl_dumpit+0x10/0x10 ? __pfx_genl_done+0x10/0x10 ? security_capable+0x9d/0xe0

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-26754 is a Linux kernel flaw in the GTP networking component. A malformed or unexpected generic netlink interaction can trigger a use-after-free or null pointer dereference, causing a kernel crash. The bundle shows kernel stable fixes and Debian LTS advisories, but no evidence of active exploitation.

Executive priority

Treat this as a kernel stability and availability risk, with higher priority for telecom environments using GTP. Patch through normal kernel maintenance unless local exposure analysis shows GTP is active on critical systems.

Technical view

The issue is in gtp_genl_dump_pdp(). The GTP per-network-namespace operations must be registered before the generic netlink family; the wrong ordering can leave state unavailable during dump handling. Syzkaller triggered a KASAN null-pointer dereference/general protection fault on Linux 6.8.0-rc3.

Likely exposure

Exposure is most likely on Linux systems that include or load the GTP kernel subsystem, commonly relevant to telecom or mobile core environments. General-purpose Linux systems may be affected by version, but practical exposure depends on whether the GTP functionality is present and usable.

Exploitation context

The source bundle identifies a syzkaller-found crash and fixed Linux stable commits. CISA KEV status is false, and the provided sources do not show active exploitation, public weaponization, or a confirmed attacker privilege requirement.

Researcher notes

The bundle supports a memory-safety crash in the Linux GTP generic netlink dump path. It does not provide CVSS, CWE, exploitability analysis, or privilege requirements. Avoid assuming remote exploitation from the available evidence.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable fixes.
  • Follow distribution advisories, including Debian LTS guidance where applicable.
  • Inventory systems running affected Linux kernel versions and GTP support.
  • Prioritize exposed telecom or mobile packet-core systems.
  • If patch timing is constrained, check vendor guidance for supported compensating controls.

Validation and detection

  • Check the running kernel version against vendor-fixed packages or stable commits.
  • Verify whether the GTP kernel module or subsystem is present or loaded.
  • Confirm Debian LTS systems include the advisory-fixed kernel package.
  • Review kernel logs for GTP-related crashes or general protection faults.
  • Track remediation through configuration management or vulnerability scanning evidence.
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-2024-26754 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
2ADP providers
11Source links

SSVC decision data

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

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
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69, 459aa660eb1d8ce67080da1983bb81d716aa5a69unaffected
LinuxLinux4.7, 0, 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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