# CVE-2026-53302: linux: In the Linux kernel, the following vulnerability has been resolved:  crypto: eip93 - fix hmac setkey algo selection...

CVE-2026-53302 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53302 (version 7.0.10-1), released June 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-53302
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 26, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  crypto: eip93 - fix hmac setkey algo selection  eip93_hmac_setkey() allocates a temporary ahash transform for computing HMAC ipad/opad key material. The allocation uses the driver-specific cra_driver_name (e.g. "sha256-eip93") but passes CRYPTO_ALG_ASYNC as the mask, which excludes async algorithms.  Since the EIP93 hash algorithms are the only ones registered under those driver names and they are inherently async, the lookup is self-contradictory and always fails with -ENOENT.  When called from the AEAD setkey path, this failure leaves the SA record partially initialized with zeroed digest fields. A subsequent crypto operation then dereferences a NULL pointer in the request context, resulting in a kernel panic:  ```   pc : eip93_aead_handle_result+0xc8c/0x1240 [crypto_hw_eip93]   lr : eip93_aead_handle_result+0xbec/0x1240 [crypto_hw_eip93]   sp : ffffffc082feb820   x29: ffffffc082feb820 x28: ffffff8011043980 x27: 0000000000000000   x26: 0000000000000000 x25: ffffffc078da0bc8 x24: 0000000091043980   x23: ffffff8004d59e50 x22: ffffff8004d59410 x21: ffffff8004d593c0   x20: ffffff8004d593c0 x19: ffffff8004d4f300 x18: 0000000000000000   x17: 0000000000000000 x16: 0000000000000000 x15: 0000007fda7aa498   x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000   x11: 0000000000000000 x10: fffffffff8127a80 x9 : 0000000000000000   x8 : ffffff8004d4f380 x7 : 0000000000000000 x6 : 000000000000003f   x5 : 0000000000000040 x4 : 0000000000000008 x3 : 0000000000000009   x2 : 0000000000000008 x1 : 0000000028000003 x0 : ffffff8004d388c0   Code: 910142b6 f94012e0 f9002aa0 f90006d3 (f9400740) ```  The reported symbol eip93_aead_handle_result+0xc8c is a resolution artifact from static functions being merged under the nearest exported symbol. Decoding the faulting sequence:  ```   910142b6  ADD  X22, X21, #0x50   f94012e0  LDR  X0, [X23, #0x20]   f9002aa0  STR  X0, [X21, #0x50]   f90006d3  STR  X19, [X22, #0x8]   f9400740  LDR  X0, [X26, #0x8] ```  The faulting LDR at [X26, #0x8] is loading ctx->flags (offset 8 in eip93_hash_ctx), where ctx has been resolved to NULL from a partially initialized or unreachable transform context following the failed setkey.  Fix this by dropping the CRYPTO_ALG_ASYNC mask from the crypto_alloc_ahash() call. The code already handles async completion correctly via crypto_wait_req(), so there is no requirement to restrict the lookup to synchronous algorithms.  Note that hashing a single 64-byte block through the hardware is likely slower than doing it in software due to the DMA round-trip overhead, but offloading it may still spare CPU cycles on the slower embedded cores where this IP is found.  [Detailed investigation report of this bug]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.10-1 | [DEBIAN-CVE-2026-53302](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53302.md) | Jun 27, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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