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CVE Record

CVE-2024-36915: nfc: llcp: fix nfc_llcp_setsockopt() unsafe copies

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix nfc_llcp_setsockopt() unsafe copies syzbot reported unsafe calls to copy_from_sockptr() [1] Use copy_safe_from_sockptr() instead. [1] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in nfc_llcp_setsockopt+0x6c2/0x850 net/nfc/llcp_sock.c:255 Read of size 4 at addr ffff88801caa1ec3 by task syz-executor459/5078 CPU: 0 PID: 5078 Comm: syz-executor459 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] copy_from_sockptr include/linux/sockptr.h:55 [inline] nfc_llcp_setsockopt+0x6c2/0x850 net/nfc/llcp_sock.c:255 do_sock_setsockopt+0x3b1/0x720 net/socket.c:2311 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f7fac07fd89 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff660eb788 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7fac07fd89 RDX: 0000000000000000 RSI: 0000000000000118 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000020000a80 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A local, low-privileged user can trigger an out-of-bounds kernel memory read through Linux NFC socket handling. This may expose sensitive kernel data or crash the system. The supplied CVSS score is 7.1 (high); integrity impact is not identified.

Executive priority

Treat this as a high-priority kernel maintenance issue, especially for shared Linux systems, developer platforms, and hosts running untrusted workloads. It is less urgent where vulnerable kernels are absent or NFC LLCP is unavailable, but those conditions should be verified rather than assumed. No active exploitation is evidenced in the supplied sources.

Technical view

Linux NFC LLCP setsockopt handling used an unsafe copy_from_sockptr() operation, allowing a four-byte slab out-of-bounds read. KASAN and syzbot reproduced the flaw in nfc_llcp_setsockopt(). The kernel fix replaces the operation with copy_safe_from_sockptr().

Likely exposure

Exposure is most likely on affected Linux kernels where NFC LLCP functionality is available and untrusted users or workloads can make local socket calls. The supplied version data identifies affected releases but is insufficiently normalized for reliable range matching; confirm distribution backports and kernel builds individually.

Exploitation context

The supplied evidence shows automated syzbot reproduction and a kernel memory-safety failure. It does not establish public weaponization or active exploitation, and the CVE is not listed as KEV in the bundle. Network-only attackers are not indicated because the CVSS vector requires local access and low privileges.

Researcher notes

The reported KASAN trace identifies a four-byte slab out-of-bounds read at net/nfc/llcp_sock.c:255 during setsockopt. CVSS 3.1 is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. The bundle supplies four stable-kernel fix commits, but does not map each commit clearly to every affected release.

Mitigation direction

  • Install the vendor-supported kernel update containing the listed fix or an equivalent backport.
  • Check distribution advisories because package versions may contain fixes without matching upstream version numbers.
  • Prioritize multi-user systems and hosts running untrusted local workloads.
  • Follow vendor guidance for any temporary mitigation when immediate kernel replacement is unavailable.

Validation and detection

  • Record each host's running kernel release, build, architecture, and distribution package version.
  • Compare installed packages against the relevant distribution security advisory and backport status.
  • Verify source-based kernels contain one of the listed fixes or an equivalent safe-copy change.
  • Confirm whether NFC LLCP functionality is present and available to untrusted local users.
  • Review kernel logs for NFC LLCP-related out-of-bounds reports or unexplained crashes.
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-2024-36915 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
2ADP providers
6Source 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
7.1CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H1.85.2Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2024-36915Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7, 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7, 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7, 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7unaffected
LinuxLinux3.10, 0, 6.1.119, 6.6.47, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

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