CVE-2025-40259 — scsi: sg: Do not sleep in atomic context
In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Do not sleep in atomic context sg_finish_rem_req() calls blk_rq_unmap_user(). The latter function may sleep. Hence, call sg_finish_rem_req() with interrupts enabled instead of disabled.
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 0.2% (30-day exploitation probability)+1
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.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
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).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
version fa55ef3f803fc7c20be0ab809e6278c31febd875version 4.12≥ 4.9.89 and < 4.10≥ 4.4.123 and < 4.5≥ 4.1.52 and < 4.2≥ 3.18.101 and < 3.19≥ 3.16.85 and < 3.17version ae9b6ae2e77947534e255903627cc62746ea77e2 and 11 moreversion 4a8e8e0af9a520a685e0ab2d489327d5220d7ce2version 6af37613289cfd32516ada47e444b48a638829c8≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < 11eeee00c94d770d4e45364060b5f1526dfe567bversion 8d1f3b474a89b42f957ba3bae959dd3cd16531ca≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < 90449f2d1e1f020835cba5417234636937dd657e≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < 6983d8375c040bb449d2187f4a57a20de01244fe≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < b2c0340cfa25c5c1f65e8590cc1a2dc97d14ef0f≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < b343cee5df7e750d9033fba33e96fc4399fa88a5≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < 3dfd520c3b4ffe69e0630c580717d40447ab842f≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < 109afbd88ecc46b6cc7551367222387e97999765≥ 97d27b0dd015e980ade63fda111fd1353276e28b and < db6ac8703ab2b473e1ec845f57f6dd961a388d9f |
Vulnerable | CVE Program (cve.org) e CISA ADP |
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.20%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Not enough vector or weakness data: use the affected application’s logs as a starting point.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- Affected products added · linux/linux
- SSVC assessment updated
- Source status changed · → Deferred
- Record created in this database
- 2025
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
8 on the record
- git.kernel.org/stable/c/3dfd520c3b4ffe69e0630c580717d40447ab842f
- git.kernel.org/stable/c/db6ac8703ab2b473e1ec845f57f6dd961a388d9f
- git.kernel.org/stable/c/b2c0340cfa25c5c1f65e8590cc1a2dc97d14ef0f
- git.kernel.org/stable/c/90449f2d1e1f020835cba5417234636937dd657e
- git.kernel.org/stable/c/11eeee00c94d770d4e45364060b5f1526dfe567b
- git.kernel.org/stable/c/109afbd88ecc46b6cc7551367222387e97999765
- git.kernel.org/stable/c/6983d8375c040bb449d2187f4a57a20de01244fe
- git.kernel.org/stable/c/b343cee5df7e750d9033fba33e96fc4399fa88a5
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 6h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 6h
- 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 CVSS score published by NVD, the CNA, CISA or GitHub so far.
- No fixed version, patch or mitigation documented.
- No CWE classification.
- 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-2025-40259 is "scsi: sg: Do not sleep in atomic context", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% 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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