{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74578",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74578"
  ],
  "published": "2026-08-16T08:19:18Z",
  "summary": "crypto: algif_skcipher - force synchronous processing on trees without ctx->state",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_skcipher - force synchronous processing on trees without ctx->state\n\nThe AIO/async path in skcipher_recvmsg() passes the socket-wide ctx->iv\ndirectly into the skcipher request. After io_submit() the socket lock is\ndropped and the request is processed asynchronously, so a concurrent\nsendmsg(ALG_SET_IV) can overwrite ctx->iv and make the in-flight request\nrun under an attacker-controlled IV. For CTR/stream modes this is\nIV/keystream reuse and lets an unprivileged user recover the plaintext of\na concurrent operation.\n\nSnapshotting ctx->iv into per-request storage for the async path is not\nsufficient. For ciphers with statesize == 0 - which includes cbc and ctr -\nthe MSG_MORE inter-chunk IV chaining is carried solely by the in-place\nreq->iv writeback, which a snapshot redirects into per-request memory that\naf_alg_free_resources() releases on completion, silently producing wrong\noutput. Writing the IV back from the completion callback instead is not\npossible either: that would require lock_sock() there, but the callback can\nrun in softirq/atomic context, so it must not sleep.\n\nMake the operation synchronous instead, which removes both the IV race and\nany writeback race. This is equivalent to the upstream resolution, commit\nfcc77d33a34c (\"net: Remove support for AIO on sockets\"), which removed the\nAIO socket path across net/ entirely and so produces the same end state for\nthis file. This patch deviates from that commit deliberately: rather than\nremoving AIO socket support tree-wide, which would be far too invasive for\nstable, it removes only the AIO branch in crypto/algif_skcipher.c.\nio_submit() now completes synchronously; AF_ALG async is rarely used in\npractice.\n\nThe -EIOCBQUEUED check in skcipher_recvmsg() is now dead but harmless,\nand is left alone to keep the fix minimal.\n\nTested on 6.6.y: attacker IV injection dropped from 2296/200000 to 0/200000\nafter the change; MSG_MORE chunked CTR output bit-identical to single-shot.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74578"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf09b0be8e851f050e98da702d247c14d81b591a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/73dd3bf704ca6c20639de70c08e9a10bee904a95"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1a87ca0843d74482402a206ea2dfb315ee9acbd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7b91e51d0eb7cbb07f7f086f9176bd93dbbc85dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60eafc7b08c6689ea3ad39eff8d97aefc8a087c7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d7860b682da55433b5da0591b0e4c1982ecd2689"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b05defc41b27c7d0c05c45f67bf5b91c28f93669"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fcc77d33a34cf271702e8daafb6c593e4626776d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local syscalls on an AF_ALG skcipher socket (socket/bind/accept/sendmsg plus async recvmsg, io_submit, aio_read, or io_uring read); the bug is not reachable from remote network protocols.\nAC:L - The attacker fully controls the race by running concurrent threads or syscalls on the same socket, timing async recvmsg/io_submit against sendmsg(ALG_SET_IV); pre-fix testing achieved thousands of successful IV injections in 200000 attempts.\nPR:L - Any unprivileged local user can create and use AF_ALG skcipher sockets without CAP_NET_ADMIN or init-namespace root; only standard UNIX discretionary access to the target socket FD is required, which includes same-UID multi-threaded processes.\nUI:N - Exploitation is fully attacker-driven through direct syscalls and requires no victim interaction such as opening files, clicking links, or mounting filesystems.\nS:U - Impact is confined to cryptographic operations on the compromised AF_ALG socket within the attacker's security context; it does not cross VM, container, or kernel-user authority boundaries like KVM escape or IOMMU bypass.\nC:H - Concurrent IV injection on CTR/stream ciphers causes keystream reuse, letting an attacker recover the full plaintext of an in-flight decrypt/encrypt on the same keyed socket even when the key never leaves kernel memory.\nI:H - Attacker-controlled IV injection corrupts in-flight cipher output and breaks MSG_MORE CBC/CTR chaining (statesize==0), silently producing attacker-influenced ciphertext/plaintext and undermining cryptographic integrity of concurrent operations.\nA:N - The flaw causes information disclosure and silent cryptographic corruption but does not kernel panic, oops, hang, or reliably deny service; availability impact is none beyond possible application-level misbehavior."
    }
  }
}