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CVE Record

CVE-2024-26707: net: hsr: remove WARN_ONCE() in send_hsr_supervision_frame()

In the Linux kernel, the following vulnerability has been resolved: net: hsr: remove WARN_ONCE() in send_hsr_supervision_frame() Syzkaller reported [1] hitting a warning after failing to allocate resources for skb in hsr_init_skb(). Since a WARN_ONCE() call will not help much in this case, it might be prudent to switch to netdev_warn_once(). At the very least it will suppress syzkaller reports such as [1]. Just in case, use netdev_warn_once() in send_prp_supervision_frame() for similar reasons. [1] HSR: Could not send supervision frame WARNING: CPU: 1 PID: 85 at net/hsr/hsr_device.c:294 send_hsr_supervision_frame+0x60a/0x810 net/hsr/hsr_device.c:294 RIP: 0010:send_hsr_supervision_frame+0x60a/0x810 net/hsr/hsr_device.c:294 ... Call Trace: <IRQ> hsr_announce+0x114/0x370 net/hsr/hsr_device.c:382 call_timer_fn+0x193/0x590 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb20 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x21a/0x8de kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 ... This issue is also found in older kernels (at least up to 5.10).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2024-26707 is a Linux kernel issue in HSR/PRP networking error handling. A failed packet allocation could trigger a kernel warning report. The upstream fix changes the warning path, reducing disruptive warning behavior rather than describing data theft or direct remote compromise.

Executive priority

Handle through normal kernel patch management unless HSR/PRP is operationally important in your environment. There is no source-backed evidence of active exploitation or severe business impact in the provided bundle.

Technical view

The flaw is in net/hsr/hsr_device.c around send_hsr_supervision_frame(), with a similar PRP path adjusted. When hsr_init_skb() fails to allocate resources, WARN_ONCE() could fire from timer/IRQ context. Stable kernel commits replace it with netdev_warn_once().

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions with HSR/PRP networking code present or used. The source lists Linux 5.9 through several stable branches and notes older kernels, at least up to 5.10, also contain the issue.

Exploitation context

The bundle cites Syzkaller finding the warning. It does not cite active exploitation, KEV listing, public exploitation, privilege escalation, or remote code execution. Treat exploitation evidence as incomplete and currently unsupported by the provided sources.

Researcher notes

The CVE appears rooted in warning behavior after allocation failure, not a clearly described memory corruption primitive. The source does not provide CVSS, CWE, exploitability analysis, or a complete affected-version matrix beyond Linux kernel branches and stable commits.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable kernel fixes.
  • For Debian systems, review the cited Debian LTS advisory and update accordingly.
  • If vendor status is unclear, check kernel vendor guidance for CVE-2024-26707.
  • Avoid enabling or relying on HSR/PRP networking unless operationally required.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded systems.
  • Check whether deployed kernels include the referenced stable commits or downstream vendor fixes.
  • Identify systems using HSR/PRP networking functionality.
  • Review kernel logs for HSR supervision-frame warning messages.
  • Confirm vendor advisories map your distribution kernel package to this CVE.
Prepared
Confidence
medium
Sources
9

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-2024-26707 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
8Source 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
LinuxLinux121c33b07b3127f501b366bc23d2a590e2f2b8ef, 121c33b07b3127f501b366bc23d2a590e2f2b8ef, 121c33b07b3127f501b366bc23d2a590e2f2b8ef, 121c33b07b3127f501b366bc23d2a590e2f2b8ef, 121c33b07b3127f501b366bc23d2a590e2f2b8ef, 121c33b07b3127f501b366bc23d2a590e2f2b8efunaffected
LinuxLinux5.9, 0, 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8affected
Weakness

CWE details

No CWE listed

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