CVE-2024-26686: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
Vulnerability summary
CVE-2024-26686 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.6% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 19 · Related 10Timeline
- 03-04-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time. Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/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:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
12%
Versus all other CVEs
30-day change
No change 0.00 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 causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu117 products
- linuxAll versions (No fix recorded) | < 5.15.0-144.157
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1088.95
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4fe85bdaabd63f8f8579b24a10ed597c9c482164 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0c35d1914353799c54fa1843fe7dea6fcbcdbac5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3820b0fac7732a653bcc6f6ac20c1d72e697f8f6 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 27978243f165b44e342f28f449b91327944ea071 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7601df8031fd67310af891897ef6cc0df4209305 | 2.6.12
- linux_kernel< 6.1.82 | ≥ 6.2, < 6.7.6 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3
Debian1 product
- linux< 6.1.82-1 | < 6.7.7-1
3 vendors · 120 products
