298 lines
17 KiB
JSON
298 lines
17 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-2026-74578",
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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": "2026-08-15T05:44:03.917Z",
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"datePublished": "2026-08-16T08:20:32.055Z",
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"dateUpdated": "2026-10-16T19:05:57.566Z"
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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": "2026-08-17T05:48:57.219Z"
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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: 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."
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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:N",
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"baseScore": 7.1,
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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 - 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."
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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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"crypto/algif_skcipher.c"
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],
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"versions": [
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "bf09b0be8e851f050e98da702d247c14d81b591a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "73dd3bf704ca6c20639de70c08e9a10bee904a95",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "f1a87ca0843d74482402a206ea2dfb315ee9acbd",
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"status": "affected",
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "7b91e51d0eb7cbb07f7f086f9176bd93dbbc85dd",
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"status": "affected",
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "60eafc7b08c6689ea3ad39eff8d97aefc8a087c7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "d7860b682da55433b5da0591b0e4c1982ecd2689",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "b05defc41b27c7d0c05c45f67bf5b91c28f93669",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
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"lessThan": "fcc77d33a34cf271702e8daafb6c593e4626776d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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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"crypto/algif_skcipher.c"
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],
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"versions": [
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{
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"version": "4.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.14",
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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": "5.10.261",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/bf09b0be8e851f050e98da702d247c14d81b591a"
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},
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{
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"url": "https://git.kernel.org/stable/c/73dd3bf704ca6c20639de70c08e9a10bee904a95"
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},
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{
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"url": "https://git.kernel.org/stable/c/f1a87ca0843d74482402a206ea2dfb315ee9acbd"
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},
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{
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"url": "https://git.kernel.org/stable/c/7b91e51d0eb7cbb07f7f086f9176bd93dbbc85dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/60eafc7b08c6689ea3ad39eff8d97aefc8a087c7"
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},
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{
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"url": "https://git.kernel.org/stable/c/d7860b682da55433b5da0591b0e4c1982ecd2689"
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},
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{
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"url": "https://git.kernel.org/stable/c/b05defc41b27c7d0c05c45f67bf5b91c28f93669"
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},
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{
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"url": "https://git.kernel.org/stable/c/fcc77d33a34cf271702e8daafb6c593e4626776d"
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}
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],
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"title": "crypto: algif_skcipher - force synchronous processing on trees without ctx->state",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74578",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:00:58.726885Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:57.566Z"
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}
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}
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]
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}
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} |