{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27061", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.215Z", "datePublished": "2024-05-01T13:00:17.611Z", "dateUpdated": "2026-08-05T11:29:18.527Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:18.527Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: sun8i-ce - Fix use after free in unprepare\n\nsun8i_ce_cipher_unprepare should be called before\ncrypto_finalize_skcipher_request, because client callbacks may\nimmediately free memory, that isn't needed anymore. But it will be\nused by unprepare after free. Before removing prepare/unprepare\ncallbacks it was handled by crypto engine in crypto_finalize_request.\n\nUsually that results in a pointer dereference problem during a in\ncrypto selftest.\n Unable to handle kernel NULL pointer dereference at\n virtual address 0000000000000030\n Mem abort info:\n ESR = 0x0000000096000004\n EC = 0x25: DABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x04: level 0 translation fault\n Data abort info:\n ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n user pgtable: 4k pages, 48-bit VAs, pgdp=000000004716d000\n [0000000000000030] pgd=0000000000000000, p4d=0000000000000000\n Internal error: Oops: 0000000096000004 [#1] SMP\n\nThis problem is detected by KASAN as well.\n ==================================================================\n BUG: KASAN: slab-use-after-free in sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]\n Read of size 8 at addr ffff00000dcdc040 by task 1c15000.crypto-/373\n\n Hardware name: Pine64 PinePhone (1.2) (DT)\n Call trace:\n dump_backtrace+0x9c/0x128\n show_stack+0x20/0x38\n dump_stack_lvl+0x48/0x60\n print_report+0xf8/0x5d8\n kasan_report+0x90/0xd0\n __asan_load8+0x9c/0xc0\n sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]\n crypto_pump_work+0x354/0x620 [crypto_engine]\n kthread_worker_fn+0x244/0x498\n kthread+0x168/0x178\n ret_from_fork+0x10/0x20\n\n Allocated by task 379:\n kasan_save_stack+0x3c/0x68\n kasan_set_track+0x2c/0x40\n kasan_save_alloc_info+0x24/0x38\n __kasan_kmalloc+0xd4/0xd8\n __kmalloc+0x74/0x1d0\n alg_test_skcipher+0x90/0x1f0\n alg_test+0x24c/0x830\n cryptomgr_test+0x38/0x60\n kthread+0x168/0x178\n ret_from_fork+0x10/0x20\n\n Freed by task 379:\n kasan_save_stack+0x3c/0x68\n kasan_set_track+0x2c/0x40\n kasan_save_free_info+0x38/0x60\n __kasan_slab_free+0x100/0x170\n slab_free_freelist_hook+0xd4/0x1e8\n __kmem_cache_free+0x15c/0x290\n kfree+0x74/0x100\n kfree_sensitive+0x80/0xb0\n alg_test_skcipher+0x12c/0x1f0\n alg_test+0x24c/0x830\n cryptomgr_test+0x38/0x60\n kthread+0x168/0x178\n ret_from_fork+0x10/0x20\n\n The buggy address belongs to the object at ffff00000dcdc000\n which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 64 bytes inside of\n freed 256-byte region [ffff00000dcdc000, ffff00000dcdc100)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is entered by submitting skcipher requests to the Allwinner crypto engine from the local system — most directly via an unprivileged AF_ALG socket, or via I/O on a dm-crypt volume; no remote-facing kernel consumer (kTLS, MACsec, CCMP) selects this driver's cbc/ecb algorithms.\nAC:L - The free is deterministic — af_alg_async_cb() frees the request inside crypto_finalize_skcipher_request(), and sun8i_ce_cipher_unprepare() then dereferences it unconditionally on the very next line, so no race must be won for the UAF; the attacker also drives both the request submission rate and any heap spray on these multi-core SoCs.\nPR:L - No capability check exists in crypto/af_alg.c or crypto/algif_skcipher.c, so any unprivileged local user can bind cbc(aes)/ecb(aes) — which the driver registers at priority 400, outranking software implementations — and issue AIO requests that hit the hardware path.\nUI:N - The attacker triggers the bug entirely from their own process by issuing crypto requests; no victim action, mount, or file open is required.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Slab use-after-free with reads through freed pointers — rctx->flow indexes ce->chanlist[] unbounded, and scatterwalk_map_and_copy() reads through a freed scatterlist — giving an attacker who reclaims the object an arbitrary kernel-memory read primitive.\nI:H - unprepare() writes through freed pointers: memcpy(areq->iv, chan->backup_iv, ivsize) stores 16 attacker-known bytes at a destination read from freed memory, and memzero_explicit(chan->bounce_iv, ivsize) writes through an out-of-bounds indexed pointer, yielding a controlled write usable for privilege escalation.\nA:H - The commit documents a reproducible NULL-pointer dereference oops and a KASAN slab-use-after-free in the crypto-engine kthread, which panics the kernel and can be triggered repeatedly by an unprivileged user." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c" ], "versions": [ { "version": "4136212ab18eb3dce6efb6e18108765c36708f71", "lessThan": "dc60b25540c82fc4baa95d1458ae96ead21859e0", "status": "affected", "versionType": "git" }, { "version": "4136212ab18eb3dce6efb6e18108765c36708f71", "lessThan": "51a7d338c212e0640b1aca52ba6590d5bea49879", "status": "affected", "versionType": "git" }, { "version": "4136212ab18eb3dce6efb6e18108765c36708f71", "lessThan": "183420038444547c149a0fc5f58e792c2752860c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.7.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/dc60b25540c82fc4baa95d1458ae96ead21859e0" }, { "url": "https://git.kernel.org/stable/c/51a7d338c212e0640b1aca52ba6590d5bea49879" }, { "url": "https://git.kernel.org/stable/c/183420038444547c149a0fc5f58e792c2752860c" } ], "title": "crypto: sun8i-ce - Fix use after free in unprepare", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-07-17T15:06:02.450614Z", "id": "CVE-2024-27061", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-17T15:06:18.867Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:21:05.883Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/dc60b25540c82fc4baa95d1458ae96ead21859e0", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/51a7d338c212e0640b1aca52ba6590d5bea49879", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/183420038444547c149a0fc5f58e792c2752860c", "tags": [ "x_transferred" ] } ] } ] } }