Affects Linux kernel core infrastructure; globally utilized across industries; high disruption risk.
CVE-2026-43011
Linux kernel net/x25: skb double-free bug; may crash kernel.
Is CVE-2026-43011 being exploited?
Not confirmed. CVE-2026-43011 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 0.59% probability of exploitation in the next 30 days.
How severe is CVE-2026-43011?
CVE-2026-43011 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-2026-43011?
Yes. A fix has been recorded for CVE-2026-43011. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43011 affect?
CVE-2026-43011 affects Linux kernel (net/x25). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43011?
Apply latest kernel patch and reboot as needed
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Kernel skb double-free in net/x25 may cause memory corruption and crash; potential local DoS.
Immediate action required
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 3f5e3005984645bf5bd129c6b13149879580b1fb
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < f782dd382203b2a8c4552a628431b7de65a19a7b
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 524371398d8463ea7e101fce2cbf3915645d1730
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < fa1dbc93530b34fab0da9862426fe9c918c74dc0
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < c87dd137c0dad07cc55f98181ff380b0c23d2878
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < d10a26aa4d072320530e6968ef945c8c575edf61
- affected2.6.12
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.