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CVE Record

CVE-2024-46783: tcp_bpf: fix return value of tcp_bpf_sendmsg()

In the Linux kernel, the following vulnerability has been resolved: tcp_bpf: fix return value of tcp_bpf_sendmsg() When we cork messages in psock->cork, the last message triggers the flushing will result in sending a sk_msg larger than the current message size. In this case, in tcp_bpf_send_verdict(), 'copied' becomes negative at least in the following case: 468 case __SK_DROP: 469 default: 470 sk_msg_free_partial(sk, msg, tosend); 471 sk_msg_apply_bytes(psock, tosend); 472 *copied -= (tosend + delta); // <==== HERE 473 return -EACCES; Therefore, it could lead to the following BUG with a proper value of 'copied' (thanks to syzbot). We should not use negative 'copied' as a return value here. ------------[ cut here ]------------ kernel BUG at net/socket.c:733! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 3265 Comm: syz-executor510 Not tainted 6.11.0-rc3-syzkaller-00060-gd07b43284ab3 #0 Hardware name: linux,dummy-virt (DT) pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : sock_sendmsg_nosec net/socket.c:733 [inline] pc : sock_sendmsg_nosec net/socket.c:728 [inline] pc : __sock_sendmsg+0x5c/0x60 net/socket.c:745 lr : sock_sendmsg_nosec net/socket.c:730 [inline] lr : __sock_sendmsg+0x54/0x60 net/socket.c:745 sp : ffff800088ea3b30 x29: ffff800088ea3b30 x28: fbf00000062bc900 x27: 0000000000000000 x26: ffff800088ea3bc0 x25: ffff800088ea3bc0 x24: 0000000000000000 x23: f9f00000048dc000 x22: 0000000000000000 x21: ffff800088ea3d90 x20: f9f00000048dc000 x19: ffff800088ea3d90 x18: 0000000000000001 x17: 0000000000000000 x16: 0000000000000000 x15: 000000002002ffaf x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: ffff8000815849c0 x9 : ffff8000815b49c0 x8 : 0000000000000000 x7 : 000000000000003f x6 : 0000000000000000 x5 : 00000000000007e0 x4 : fff07ffffd239000 x3 : fbf00000062bc900 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 00000000fffffdef Call trace: sock_sendmsg_nosec net/socket.c:733 [inline] __sock_sendmsg+0x5c/0x60 net/socket.c:745 ____sys_sendmsg+0x274/0x2ac net/socket.c:2597 ___sys_sendmsg+0xac/0x100 net/socket.c:2651 __sys_sendmsg+0x84/0xe0 net/socket.c:2680 __do_sys_sendmsg net/socket.c:2689 [inline] __se_sys_sendmsg net/socket.c:2687 [inline] __arm64_sys_sendmsg+0x24/0x30 net/socket.c:2687 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 Code: f9404463 d63f0060 3108441f 54fffe81 (d4210000) ---[ end trace 0000000000000000 ]---

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-46783 is a Linux kernel flaw in TCP BPF message handling. A malformed return value path can trigger a kernel BUG/Oops, creating an availability concern. The sources show stable kernel fixes and downstream advisories, but do not show active exploitation or a complete impact rating.

Executive priority

Patch through normal kernel security maintenance, with faster handling for shared, production, or safety-sensitive Linux systems. Current evidence supports availability risk, not confirmed active exploitation. Business urgency depends on whether affected kernels run on critical systems or vendor-managed appliances.

Technical view

In tcp_bpf_sendmsg(), corked socket messages can cause tcp_bpf_send_verdict() to subtract more bytes than were copied, making copied negative. That negative value can be returned through sendmsg handling and trigger a kernel BUG in net/socket.c. The fix corrects return handling rather than using negative copied as the send result.

Likely exposure

Exposure is limited to affected Linux kernel versions and downstream products carrying vulnerable kernels. The bundle lists Linux 4.17 and several stable lines through 6.11 as affected, with default status otherwise unaffected. Remote reachability, required privileges, and exact distribution backport status are not fully established in the provided evidence.

Exploitation context

The CVE is not listed as CISA KEV, and the provided sources do not claim active exploitation. The public description cites syzbot-triggered kernel crash evidence. Treat this primarily as a potential denial-of-service kernel stability issue unless vendor advisories for your platform state broader impact.

Researcher notes

The key behavior is a negative copied value after tcp_bpf_send_verdict() handles a corked sk_msg and drop/default verdict path. The call trace reaches __sock_sendmsg and BUGs in net/socket.c. Evidence does not establish exploit reliability, privilege boundary, or remote attack surface.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable fixes.
  • Use distribution security updates, such as Debian LTS advisories, where applicable.
  • Check Siemens advisories if operating affected Siemens products.
  • Track vendor kernel backports rather than relying only on upstream version numbers.
  • Prioritize internet-facing or multi-tenant Linux systems first.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded systems.
  • Compare installed kernels against vendor advisories and fixed upstream commits.
  • Confirm whether distribution packages include the CVE-2024-46783 backport.
  • Review crash telemetry for kernel BUG/Oops events in net/socket.c sendmsg paths.
  • Document systems deferred from patching and their vendor support status.
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-2024-46783 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
3ADP providers
12Source 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

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
LinuxLinux4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0, 4f738adba30a7cfc006f605707e7aee847ffefa0unaffected
LinuxLinux4.17, 0, 5.4.284, 5.10.226, 5.15.167, 6.1.110, 6.6.51, 6.10.10, 6.11affected
Weakness

CWE details

No CWE listed

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