crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec authencesn assumes an ESP/ESN-formatted AAD. When assoclen is shorter than the minimum expected length, crypto_authenc_esn_decrypt() can advance past the end of the destination scatterlist and trigger a NULL pointer dereference in scatterwalk_map_and_copy(), leading to a kernel panic (DoS). Add a minimum AAD length check to fail fast on invalid inputs.

Timeline

1. Feb 4, 2026, 4:07 PM UTCCVE published
2. Jun 10, 2026, 8:40 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 19, 2026, 6:25 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in df22c9a65e9a9daa368a72fed596af9d7d5876bb; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in fee86edf5803f1d1f19e3b4f2dacac241bddfa48; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in 767e8349f7e929b7dd95c08f0b4cb353459b365e; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in b0a9609283a5c852addb513dafa655c61eebc1ef; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in 161bdc90fce25bd9890adc67fa1c8563a7acbf40; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in 9532ff0d0e90ff78a214299f594ab9bac81defe4; From 104880a6b470958ddc30e139c41aa4f6ed3a5234 · fixed in 2397e9264676be7794f8f7f1e9763d90bd3c7335

• Linux Linux

  4.3

• KernelLinux

  From 4.3.0 · fixed in 5.10.249; From 5.11.0 · fixed in 5.15.199; From 5.16.0 · fixed in 6.1.162; From 6.2.0 · fixed in 6.6.122; From 6.7.0 · fixed in 6.12.68; From 6.13.0 · fixed in 6.18.8

References 7