What is CVE-2026-63805?

CVE-2026-63805 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.5 onward and patched in 6.18.38, 7.1.3 and 7.2-rc1. CVE-2026-63805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-63805?

CVE-2026-63805 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-63805?

Yes, CVE-2026-63805 has been patched. Fixed versions include 6.18.38, 7.1.3 and 7.2-rc1. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-63805 actively exploited?

CVE-2026-63805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-63805

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.

Package Linux Kernel

Published 2026-07-19

Last modified 2026-07-19

Patch available

Yes

Affected versions

Linux kernel versions 5.5 and later are affected. Fixed in 6.18.38, 7.1.3, 7.2-rc1 and their respective stable series.

Affected from

≥ 5.5

Fixed in

✓ 6.18.38 6.18.x ✓ 7.1.3 7.1.x ✓ 7.2-rc1

References

3 total

Frequently asked questions

What is CVE-2026-63805?

CVE-2026-63805 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.5 onward and has been patched in 6.18.38, 7.1.3 and 7.2-rc1. CVE-2026-63805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-63805?

Yes — CVE-2026-63805 has been patched. Fixed versions include 6.18.38, 7.1.3 and 7.2-rc1. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-63805 actively exploited?

No — CVE-2026-63805 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.