Affects Linux kernel, core OS; widespread across industries; high disruption risk.
CVE-2026-43493
Linux kernel crypto MAY_BACKLOG handling fix (CVE-2026-43493).
Is CVE-2026-43493 being exploited?
Not confirmed. CVE-2026-43493 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-43493?
CVE-2026-43493 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-43493?
Yes. A fix has been recorded for CVE-2026-43493. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43493 affect?
CVE-2026-43493 affects Linux kernel. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43493?
Patch kernel to patched version; reboot.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local user could trigger backlog handling errors, risking DoS or instability in the crypto path.
Immediate action required
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < ae7e95638d956d556d74b9abb9e780d3bd3dcd9e
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 1d7f07df450bac3301938fbc4251f2611be4084e
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 76641449b28979ebd6c02e9598367e119e385236
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 9f1cbca178c03188e201ed175251372149bb25f2
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < eb34e243df57e32f4c08fa191f3602ea19076276
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 77d55bc8675ee851ed639dc9be77325a8024cf67
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a
- affected>= 5a1436beec5744029f3ac90b6fe71a698dcd6155 and < 915b692e6cb723aac658c25eb82c58fd81235110
- affected2.6.34
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.