CVE-2024-27435: nvme: fix reconnection fail due to reserved tag allocation
Vulnerability summary
CVE-2024-27435 is a high (CVSS 7.5) Improper Locking vulnerability in linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 15Timeline
- 17-05-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: nvme: fix reconnection fail due to reserved tag allocation We found a issue on production environment while using NVMe over RDMA, admin_q reconnect failed forever while remote target and network is ok. After dig into it, we found it may caused by a ABBA deadlock due to tag allocation. In my case, the tag was hold by a keep alive request waiting inside admin_q, as we quiesced admin_q while reset ctrl, so the request maked as idle and will not process before reset success. As fabric_q shares tagset with admin_q, while reconnect remote target, we need a tag for connect command, but the only one reserved tag was held by keep alive command which waiting inside admin_q. As a result, we failed to reconnect admin_q forever. In order to fix this issue, I think we should keep two reserved tags for admin queue.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.40% 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 causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu106 products
- linuxAll versions (No fix recorded) | < 6.8.0-35.35
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ed01fee283a067c72b2d6500046080dbc1bb9dae, < 149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8 | ≥ ed01fee283a067c72b2d6500046080dbc1bb9dae, < ff2f90f88d78559802466ad1c84ac5bda4416b3a | ≥ ed01fee283a067c72b2d6500046080dbc1bb9dae, < 6851778504cdb49431809b4ba061903d5f592c96 | ≥ ed01fee283a067c72b2d6500046080dbc1bb9dae, < 262da920896e2f2ab0e3947d9dbee0aa09045818 | ≥ ed01fee283a067c72b2d6500046080dbc1bb9dae, < de105068fead55ed5c07ade75e9c8e7f86a00d1d | 5.12
- linux_kernelEOL≥ 5.12.1, < 6.1.83 | ≥ 6.2, < 6.6.23 | ≥ 6.7, < 6.7.11 | ≥ 6.8, < 6.8.2 | 5.12 | 5.12:rc4 | 5.12:rc5 | 5.12:rc6 | 5.12:rc7 | 5.12:rc8
Debian1 product
- linux< 6.1.85-1 | < 6.7.12-1
3 vendors · 109 products
