221 lines
13 KiB
JSON
221 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-27061",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.215Z",
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"datePublished": "2024-05-01T13:00:17.611Z",
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"dateUpdated": "2026-08-05T11:29:18.527Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:29:18.527Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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)"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c"
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],
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"versions": [
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"programFiles": [
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"drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c"
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],
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"versions": [
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{
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"version": "6.6",
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"status": "affected"
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"version": "0",
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"lessThan": "6.6",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.6.24",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.7.12",
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"lessThanOrEqual": "6.7.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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]
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"content": {
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"timestamp": "2024-07-17T15:06:02.450614Z",
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"id": "CVE-2024-27061",
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