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CVE Record

CVE-2023-53676: scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show() The function lio_target_nacl_info_show() uses sprintf() in a loop to print details for every iSCSI connection in a session without checking for the buffer length. With enough iSCSI connections it's possible to overflow the buffer provided by configfs and corrupt the memory. This patch replaces sprintf() with sysfs_emit_at() that checks for buffer boundries.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory-corruption flaw in the iSCSI target management path. If a vulnerable system has enough iSCSI connections in one session, generating the configfs information output can overflow its buffer. The sources do not provide a CVSS score, public exploitation evidence, or impact detail beyond possible memory corruption.

Executive priority

Treat this as a targeted infrastructure patching item, not a broad internet emergency based on current evidence. Prioritize storage servers and virtualization platforms that use Linux iSCSI target services, then track vendor advisories because severity and exploitation details are incomplete.

Technical view

lio_target_nacl_info_show() used sprintf() repeatedly while emitting per-connection iSCSI session details without checking the configfs buffer length. The upstream fix replaces that behavior with sysfs_emit_at(), which bounds output by the remaining buffer space.

Likely exposure

Exposure is most relevant to Linux hosts using the kernel LIO iSCSI target functionality. Systems not using the iSCSI target path are less likely to encounter this code path. The provided data lists multiple Linux kernel stable branches as affected but does not define distribution package status.

Exploitation context

The bundle does not indicate active exploitation, and KEV is false. The described condition requires enough iSCSI connections in a session to exceed the configfs output buffer. No public exploit, attacker prerequisites, or privilege boundary details are provided in the supplied sources.

Researcher notes

The key defect is unchecked string emission into a fixed configfs buffer. The available sources identify the vulnerable function and fix approach, but omit CVSS, CWE, distribution backports, and exploitability analysis. Avoid assuming remote code execution or active abuse without additional vendor evidence.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • Prioritize systems providing Linux iSCSI target services.
  • Check distribution advisories for package names, backports, and reboot requirements.
  • Reduce unnecessary iSCSI target exposure until patched.
  • Follow vendor guidance if kernel updates are delayed.

Validation and detection

  • Inventory Linux hosts running LIO iSCSI target services.
  • Compare running kernel builds against vendor fixed packages or referenced stable commits.
  • Review iSCSI target sessions for unusually high connection counts.
  • Confirm configfs iSCSI target paths are not exposed to untrusted administrative users.
  • Verify patched hosts are rebooted into the updated kernel.
Prepared
Confidence
medium
Sources
10

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-2023-53676 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
9Source 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
LinuxLinuxe48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01unaffected
LinuxLinux3.1, 0, 4.14.326, 4.19.295, 5.4.257, 5.10.197, 5.15.133, 6.1.55, 6.5.5, 6.6affected
Weakness

CWE details

No CWE listed

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