CVE-2026-43112
Linux kernel CIFS client out-of-bounds read in cifs_sanitize_prepath
Is CVE-2026-43112 being exploited?
Not confirmed. CVE-2026-43112 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-43112?
CVE-2026-43112 is rated High with a CVSS score of 8.8. 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-2026-43112?
Yes. A fix has been recorded for CVE-2026-43112. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43112 affect?
CVE-2026-43112 affects Linux kernel CIFS client. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43112?
Apply kernel patch; reboot and verify SMB mounts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attacker can trigger out-of-bounds read via empty or delimiter-only CIFS path, causing kernel crash (SEGV) and possible memory exposure.
Patch when possible
- affected>= c63433a09d6ae4c226fcbc66da4c58fc189fd746 and < a2ba20c17de8eb028f96b1d85f119d3d25655bd9
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < fbced33599653471b4581dfe1abc7b467031f126
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < 5d4fe469fe7dbff7d874c196bb680a82f2625d95
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < 86f9c23e0814cfdffda9eedf0c591c51ba209010
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3
- affected>= a31080899d5fdafcccf7f39dd214a814a2c82626 and < 78ec5bf2f589ec7fd8f169394bfeca541b077317
- affected>= 5.15.11 and < 5.15.209
- affected5.16
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.