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CVE-2026-72068· NVD / CVE Program· CNA Linux

posix-cpu-timers: Use u64 multiplication in update_rlimit_cpu()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 1fafc4d9b411645eb34de43362b966dc8fb3e263, 26aff38fefb1d6cd87e22525f41cc8f1aa61b24f, 384628d6cdde0fcd76868606fad3ad8293100afb.

Low priority for now. Upgrade to Linux Linux 1fafc4d9b411645eb34de43362b966dc8fb3e263, 26aff38fefb1d6cd87e22525f41cc8f1aa61b24f, 384628d6cdde0fcd76868606fad3ad8293100afb or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Use u64 multiplication in update_rlimit_cpu() update_rlimit_cpu() converts the RLIMIT_CPU value to nanoseconds with u64 nsecs = rlim_new * NSEC_PER_SEC; On 32-bit kernels both rlim_new (unsigned long) and NSEC_PER_SEC (1000000000L) are 32-bit, so the multiplication is performed in unsigned long and truncated for rlim_new > 4 seconds before being widened to u64. The same file already casts to u64 for the matching computation in check_process_timers(): u64 softns = (u64)soft * NSEC_PER_SEC; As a result, the truncated value is installed into the CPUCLOCK_PROF expiry cache (nextevt), causing the process CPU timer to be programmed to fire prematurely for any RLIMIT_CPU soft limit >= 5 seconds. The actual SIGXCPU/SIGKILL decision in check_process_timers() already casts to u64 and is therefore correct, so limit enforcement is not broken; only the expiry-cache programming is wrong. Apply the same cast here so both paths convert rlim_cur identically. 64-bit kernels are unaffected.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 17, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.11affected
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before feb5c87c8514444ba891b75a5a3eae57c64edaf8affected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before 384628d6cdde0fcd76868606fad3ad8293100afbaffected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before 1fafc4d9b411645eb34de43362b966dc8fb3e263affected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before cff8281bacd2866767e6194c3079d33b6c5a74f4affected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before edf6babb9edd2d3e19229ade339081f439d4f478affected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before ea6a188ee805e841a0e242f14d15953e0dfa74bbaffected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before 571e1f10b5996ba3e4dc63ea77de4aa309c384ceaffected · git
    • 858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4 and later · before 26aff38fefb1d6cd87e22525f41cc8f1aa61b24faffected · git
    • before 4.11not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1fafc4d9b411645eb34de43362b966dc8fb3e263Vendor (CNA)
Linux Linux26aff38fefb1d6cd87e22525f41cc8f1aa61b24fVendor (CNA)
Linux Linux384628d6cdde0fcd76868606fad3ad8293100afbVendor (CNA)
Linux Linux571e1f10b5996ba3e4dc63ea77de4aa309c384ceVendor (CNA)
Linux Linuxcff8281bacd2866767e6194c3079d33b6c5a74f4Vendor (CNA)
Linux Linuxea6a188ee805e841a0e242f14d15953e0dfa74bbVendor (CNA)
Linux Linuxedf6babb9edd2d3e19229ade339081f439d4f478Vendor (CNA)
Linux Linuxfeb5c87c8514444ba891b75a5a3eae57c64edaf8Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records