CVE-2026-46149 — scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()
In the Linux kernel, the following vulnerability has been resolved: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() target_tg_pt_gp_members_show() formats LUN paths with snprintf() into a 256-byte stack buffer, then will memcpy() cur_len bytes from that buffer. snprintf() returns the length the output would have had, which can exceed the buffer size when the fabric WWN is long because iSCSI IQN names can be up to 223 bytes. The check at the memcpy() site only guards the destination page write, not the source read, so memcpy() will read past the stack buffer and copy adjacent stack contents to the sysfs reader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic() will be triggered. Commit 27e06650a5ea ("scsi: target: target_core_configfs: Add length check to avoid buffer overflow") added the same bound to the target_lu_gp_members_show() but the tg_pt_gp variant was missed so resolve that here.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.1% (30-day exploitation probability)+0
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < d3cc9d490c207d57a289054397349f6f8c90354eversion 2.6.38≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < 772a896a56e0e3ef9424a025cec9176f9d8f4552≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < e501154f9d82c95d2719bcbbaf679d8fd3226ef7≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < 00d91bfdce5033f5d9b4915638ae9b0553848b5d≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < 72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < 1f678d13e939f91840cb1ebe9b88544923539d3c≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < 12f2201a56957ba020392223a7393a5eba080c1b and 1 more≥ c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 and < db0a4759d62cad4ff891e2d81ae4be73bb57f4a4 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel |
≥ 2.6.38 and < 5.10.258version 7.1-rc2version 7.1-rc1≥ 6.19 and < 7.0.7≥ 6.13 and < 6.18.30≥ 6.7 and < 6.12.88≥ 6.2 and < 6.6.140≥ 5.16 and < 6.1.175 and 1 more≥ 5.11 and < 5.15.209 |
Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.1 | CVSS 3.1 | High | 1.8 | 5.2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 7.1 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 7.1 | CVSS 3.1 | High | — | — | Linux via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.14%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
- Track CPU/memory spikes and availability drops correlated with request patterns.
Timeline
What happened to this CVE, newest first.
- 2026
- Source status changed · Analyzed → Modified
- Affected products added · linux/linux
- Record published
- Fix documented
- CVSS changed · 7.1
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 14, 2026 – Oct 14, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
11 on the record
- git.kernel.org/stable/c/1f678d13e939f91840cb1ebe9b88544923539d3c
- git.kernel.org/stable/c/e501154f9d82c95d2719bcbbaf679d8fd3226ef7
- git.kernel.org/stable/c/db0a4759d62cad4ff891e2d81ae4be73bb57f4a4
- git.kernel.org/stable/c/d3cc9d490c207d57a289054397349f6f8c90354e
- git.kernel.org/stable/c/00d91bfdce5033f5d9b4915638ae9b0553848b5d
- git.kernel.org/stable/c/72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e
- git.kernel.org/stable/c/772a896a56e0e3ef9424a025cec9176f9d8f4552
- git.kernel.org/stable/c/12f2201a56957ba020392223a7393a5eba080c1b
- github.com/advisories/GHSA-vvx9-xfcg-g62v
- cert-portal.siemens.com/productcert/html/ssa-784472.html
- nvd.nist.gov/vuln/detail/CVE-2026-46149
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 10h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 10h
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-46149 is "scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.1 describes technical severity. EPSS 0.14% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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