CVE-2026-63805

HighCVSS 7.8/10Last modified Aug 17, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

crypto: nx - fix nx_crypto_ctx_exit argument

nx_crypto_ctx_shash_exit calls nx_crypto_ctx_exit with crypto_shash_ctx(...) but crypto_shash_ctx gives a nx_crypto_ctx *, not a crypto_tfm *.

Fix the type in nx_crypto_ctx_exit and drop the bogus crypto_tfm_ctx call.

This fixes the following oops:

BUG: Unable to handle kernel data access at 0xc0403effffffffc8 Faulting instruction address: 0xc000000000396cb4 Oops: Kernel access of bad area, sig: 11 [#15] Call Trace: nx_crypto_ctx_shash_exit+0x24/0x60 crypto_shash_exit_tfm+0x28/0x40 crypto_destroy_tfm+0x98/0x140 crypto_exit_ahash_using_shash+0x20/0x40 crypto_destroy_tfm+0x98/0x140 hash_release+0x1c/0x30 alg_sock_destruct+0x38/0x60 __sk_destruct+0x48/0x2b0 af_alg_release+0x58/0xb0 __sock_release+0x68/0x150 sock_close+0x20/0x40 __fput+0x110/0x3a0 sys_close+0x48/0xa0 system_call_exception+0x140/0x2d0 system_call_common+0xf4/0x258

.. which came from hardlink(1) opportunistically using AF_ALG.

The same problem exists with nx_crypto_ctx_skcipher_exit getting a context it wasn't expecting, but apparently nobody hit that for years.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
LinuxLinux>= bfd9efddf990d152dc9912fdca520c5e1e19e1e2, < 8d8507a457667f23477a15496b91908a5b5b7cf3; >= bfd9efddf990d152dc9912fdca520c5e1e19e1e2, < 833033e6e55acf11304ff7bbbdf18351d139c281; >= bfd9efddf990d152dc9912fdca520c5e1e19e1e2, < 4e67f504ee9ded15e256b64f4fde150e917381d7
LinuxLinux5.5

References

Timeline

Published
Jul 19, 2026
Last modified
Aug 17, 2026
NVD status
Analyzed

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CVE-2026-63805: High severity, CVSS 7.8 | Vulnix