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CVE Record

CVE-2023-53462: hsr: Fix uninit-value access in fill_frame_info()

In the Linux kernel, the following vulnerability has been resolved: hsr: Fix uninit-value access in fill_frame_info() Syzbot reports the following uninit-value access problem. ===================================================== BUG: KMSAN: uninit-value in fill_frame_info net/hsr/hsr_forward.c:601 [inline] BUG: KMSAN: uninit-value in hsr_forward_skb+0x9bd/0x30f0 net/hsr/hsr_forward.c:616 fill_frame_info net/hsr/hsr_forward.c:601 [inline] hsr_forward_skb+0x9bd/0x30f0 net/hsr/hsr_forward.c:616 hsr_dev_xmit+0x192/0x330 net/hsr/hsr_device.c:223 __netdev_start_xmit include/linux/netdevice.h:4889 [inline] netdev_start_xmit include/linux/netdevice.h:4903 [inline] xmit_one net/core/dev.c:3544 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3560 __dev_queue_xmit+0x34d0/0x52a0 net/core/dev.c:4340 dev_queue_xmit include/linux/netdevice.h:3082 [inline] packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x8b1d/0x9f30 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] __sys_sendto+0x781/0xa30 net/socket.c:2176 __do_sys_sendto net/socket.c:2188 [inline] __se_sys_sendto net/socket.c:2184 [inline] __ia32_sys_sendto+0x11f/0x1c0 net/socket.c:2184 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Uninit was created at: slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:559 __alloc_skb+0x318/0x740 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6299 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2794 packet_alloc_skb net/packet/af_packet.c:2936 [inline] packet_snd net/packet/af_packet.c:3030 [inline] packet_sendmsg+0x70e8/0x9f30 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] __sys_sendto+0x781/0xa30 net/socket.c:2176 __do_sys_sendto net/socket.c:2188 [inline] __se_sys_sendto net/socket.c:2184 [inline] __ia32_sys_sendto+0x11f/0x1c0 net/socket.c:2184 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 It is because VLAN not yet supported in hsr driver. Return error when protocol is ETH_P_8021Q in fill_frame_info() now to fix it.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-53462 is a Linux kernel flaw in the HSR networking driver. When VLAN-tagged traffic reaches code that does not support VLAN handling, the kernel can read uninitialized memory. Public sources show a kernel fix exists. Exposure is likely limited to systems using the HSR driver, a specialized high-availability networking feature.

Executive priority

Treat as a targeted kernel maintenance item, not an emergency based on current evidence. Prioritize environments using Linux HSR networking or industrial/high-availability network designs. Apply normal kernel patch governance, with faster action where HSR and VLAN traffic coexist.

Technical view

The flaw is an uninitialized-value access in net/hsr/hsr_forward.c fill_frame_info(), reported by syzbot/KMSAN. The issue occurs because VLAN is not supported in the HSR driver; the fix returns an error for ETH_P_8021Q protocol handling. Affected Linux kernel versions are listed in the CVE record, with stable kernel commits referenced.

Likely exposure

Likely exposure is Linux systems with the HSR driver enabled and HSR networking in use, especially where VLAN-tagged frames may be present. Most standard servers not using HSR are less likely exposed. The provided sources do not prove broad remote exploitability.

Exploitation context

The record describes a syzbot-discovered kernel memory initialization bug, not a public attack campaign. CISA KEV status is false in the provided bundle. No cited source states active exploitation or provides a CVSS score.

Researcher notes

Evidence is limited to the CVE record and kernel stable references. The impact is described as uninitialized-value access, but no CVSS, CWE, exploit maturity, or attacker prerequisites are provided. Avoid assuming privilege escalation or data disclosure without additional vendor analysis.

Mitigation direction

  • Update to a vendor kernel that includes the referenced Linux stable HSR fix.
  • Review Linux distribution advisories for backported fixes for CVE-2023-53462.
  • Avoid unsupported VLAN-over-HSR configurations until patched or vendor guidance confirms safety.
  • If HSR is unused, consider disabling or not loading the HSR functionality per policy.

Validation and detection

  • Inventory Linux hosts and kernel versions against vendor advisories for CVE-2023-53462.
  • Check whether HSR interfaces or the HSR kernel module are present.
  • Confirm the deployed kernel includes one of the referenced stable commits or a vendor backport.
  • Review network designs for VLAN-tagged traffic interacting with HSR interfaces.
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

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CVE-2023-53462 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
0ADP providers
6Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux451d8123f89791bb628277c0bdb4cae34a3563e6, 451d8123f89791bb628277c0bdb4cae34a3563e6, 451d8123f89791bb628277c0bdb4cae34a3563e6, 451d8123f89791bb628277c0bdb4cae34a3563e6, 451d8123f89791bb628277c0bdb4cae34a3563e6unaffected
LinuxLinux5.9, 0, 5.10.195, 5.15.132, 6.1.54, 6.5.4, 6.6affected
Weakness

CWE details

No CWE listed

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