# CVE-2024-27061: linux: In the Linux kernel, the following vulnerability has been resolved:  crypto: sun8i-ce - Fix use after free in unprepa...

CVE-2024-27061 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-27061, released May 1, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-27061
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  crypto: sun8i-ce - Fix use after free in unprepare  sun8i_ce_cipher_unprepare should be called before crypto_finalize_skcipher_request, because client callbacks may immediately free memory, that isn't needed anymore. But it will be used by unprepare after free. Before removing prepare/unprepare callbacks it was handled by crypto engine in crypto_finalize_request.  Usually that results in a pointer dereference problem during a in crypto selftest.  Unable to handle kernel NULL pointer dereference at                                       virtual address 0000000000000030  Mem abort info:    ESR = 0x0000000096000004    EC = 0x25: DABT (current EL), IL = 32 bits    SET = 0, FnV = 0    EA = 0, S1PTW = 0    FSC = 0x04: level 0 translation fault  Data abort info:    ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000    CM = 0, WnR = 0, TnD = 0, TagAccess = 0    GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0  user pgtable: 4k pages, 48-bit VAs, pgdp=000000004716d000  [0000000000000030] pgd=0000000000000000, p4d=0000000000000000  Internal error: Oops: 0000000096000004 [#1] SMP  This problem is detected by KASAN as well.  ==================================================================  BUG: KASAN: slab-use-after-free in sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]  Read of size 8 at addr ffff00000dcdc040 by task 1c15000.crypto-/373   Hardware name: Pine64 PinePhone (1.2) (DT)  Call trace:   dump_backtrace+0x9c/0x128   show_stack+0x20/0x38   dump_stack_lvl+0x48/0x60   print_report+0xf8/0x5d8   kasan_report+0x90/0xd0   __asan_load8+0x9c/0xc0   sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]   crypto_pump_work+0x354/0x620 [crypto_engine]   kthread_worker_fn+0x244/0x498   kthread+0x168/0x178   ret_from_fork+0x10/0x20   Allocated by task 379:   kasan_save_stack+0x3c/0x68   kasan_set_track+0x2c/0x40   kasan_save_alloc_info+0x24/0x38   __kasan_kmalloc+0xd4/0xd8   __kmalloc+0x74/0x1d0   alg_test_skcipher+0x90/0x1f0   alg_test+0x24c/0x830   cryptomgr_test+0x38/0x60   kthread+0x168/0x178   ret_from_fork+0x10/0x20   Freed by task 379:   kasan_save_stack+0x3c/0x68   kasan_set_track+0x2c/0x40   kasan_save_free_info+0x38/0x60   __kasan_slab_free+0x100/0x170   slab_free_freelist_hook+0xd4/0x1e8   __kmem_cache_free+0x15c/0x290   kfree+0x74/0x100   kfree_sensitive+0x80/0xb0   alg_test_skcipher+0x12c/0x1f0   alg_test+0x24c/0x830   cryptomgr_test+0x38/0x60   kthread+0x168/0x178   ret_from_fork+0x10/0x20   The buggy address belongs to the object at ffff00000dcdc000   which belongs to the cache kmalloc-256 of size 256  The buggy address is located 64 bytes inside of   freed 256-byte region [ffff00000dcdc000, ffff00000dcdc100)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-27061](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27061.md) | May 1, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-27061](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27061.md) | May 1, 2024 |

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