CVE-2026-32849

Summary

NetBSD prior to commit ec8451e contains a signed integer overflow vulnerability in the cryptodev_op() function in sys/opencrypto/cryptodev.c where the local variable iov_len is declared as a signed int but assigned from an unsigned cop->dst_len value, causing undefined behavior when cop->dst_len exceeds INT_MAX. A local attacker with access to /dev/crypto and a compression session type can exploit this vulnerability by providing a dst_len value exceeding INT_MAX to trigger a kernel panic through NULL pointer dereference when CONFIG_SVS is disabled and corrupted UIO pointer arithmetic.

Affected Software

Weaknesses

• CWE-190: Integer Overflow or Wraparound
• CWE-476: NULL Pointer Dereference

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://nasm.re/posts/uaf_netbsd_crypto/
• https://github.com/NetBSD/src/commit/ec8451efc1565516aba9e7047e1a1a1ce7953a2f
• https://www.vulncheck.com/advisories/netbsd-signed-integer-overflow-in-cryptodev-op-via-cryptodev-c

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