CVE-2026-74379: dax/kmem: account for partial discontiguous resource upon removal
Vulnerability summary
CVE-2026-74379 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.6% of scored vulnerabilities.
No CVSS vector published; no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 23Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 17-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: dax/kmem: account for partial discontiguous resource upon removal When dev_dax_kmem_probe() partially succeeds (at least one range is mapped) but a subsequent range fails request_mem_region() or add_memory_driver_managed(), the probe silently continues, ultimately returning success, but with the corresponding range resource NULL'ed out. dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if the underlying resource exists. When remove_memory() is called later, it returns 0 because the memory was never added which causes dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can be removed and attempts cleanup on a NULL pointer. Fix this by skipping these ranges altogether, noting that these cases are considered success, such that the cleanup is still reached when all actually-added ranges are successfully removed.
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
Decrease -0.04 pp
From 0.21% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
- linux≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31 | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < d47b0b8a69a13e06afafa54723f3e8c99b0c788f | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 799e54c510a03a65a57627018a817838d72f35bd | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 598ed7393a639c7547b28ff3e14db9f1ac37c132 | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 30ea97affbcce236c57287c82dc6ef7a29c63b76 | ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d | 5.10
3 vendors · 159 products
