292 lines
15 KiB
JSON
292 lines
15 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-2022-49768",
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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": "2025-04-16T07:17:33.804Z",
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"datePublished": "2025-05-01T14:09:06.864Z",
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"dateUpdated": "2026-08-05T08:56:16.608Z"
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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": "2026-08-05T08:56:16.608Z"
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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\n9p: trans_fd/p9_conn_cancel: drop client lock earlier\n\nsyzbot reported a double-lock here and we no longer need this\nlock after requests have been moved off to local list:\njust drop the lock earlier."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The recursive deadlock is reached from p9_read_work()/p9_poll_mux() on the TCP (and unix) fd transport when processing peer-driven I/O errors or malformed replies; a remote malicious 9p server can close the connection or send bad headers/tags over the established TCP session to enter p9_conn_cancel().\nAC:L - After a request is fully written the writer has already put its ref, leaving the waiting client with refcount 1; the remote peer can then deterministically force cancel (ECONNRESET, bad header, unexpected tag), so p9_client_cb()'s final p9_req_put() re-takes client->lock with no race outside attacker control.\nPR:N - The attacker is the remote 9p server and needs no credentials or capabilities on the client; reply/error handling on the transport runs without authentication or privilege checks, matching other trans_fd peer-driven 9p client bugs.\nUI:N - Exploitation rides an already-configured or automounted 9p TCP session and server-driven errors/replies; the mount is a deployment precondition, not a required victim action beyond ordinary use of that mount.\nS:U - Impact is a host-kernel deadlock inside the 9p client on the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - This is a pure recursive spinlock deadlock (p9_conn_cancel → p9_client_cb → p9_req_put → p9_tag_remove on the same client->lock); it does not free early, leak, or otherwise disclose kernel memory.\nI:N - There is no memory corruption, UAF, or write primitive—only nested acquisition of the same non-recursive spinlock—so control-flow hijack or arbitrary modification is not available.\nA:H - Re-taking client->lock while already holding it deadlocks the p9_read_work kworker with preemption disabled, hangs all further 9p operations on that client, and can soft-lockup the CPU; syzbot reported the recursive lock in p9_req_put from this path."
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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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"net/9p/trans_fd.c"
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],
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"versions": [
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{
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"version": "eb1ca07f4343b4e58b97e792a85d5ba1ba103f5d",
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"lessThan": "82825dbf393f7c7979d462f9609a15bde8092b3f",
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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": "4cd195263e420311d31451cc053fde8037f326f1",
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"lessThan": "e3031280fe4eaf61a09e60823331f81f321be8e1",
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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": "9f476d7c540cb57556d3cc7e78704e6cd5100f5f",
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"lessThan": "fec1406f5e7ab20b71f6d231792b0040e3300aaf",
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"status": "affected",
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},
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{
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"lessThan": "96760723aae1b45f733f702abb4333137143909f",
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"status": "affected",
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},
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{
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"version": "9f476d7c540cb57556d3cc7e78704e6cd5100f5f",
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"lessThan": "f14858bc77c567e089965962877ee726ffad0556",
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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": "9f476d7c540cb57556d3cc7e78704e6cd5100f5f",
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"lessThan": "a4f1a01b2e81378fce9ca528d4d8a049e4b58fcd",
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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": "9f476d7c540cb57556d3cc7e78704e6cd5100f5f",
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"lessThan": "612c977f5d481f551d03d83d0aef588845c1300c",
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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": "9f476d7c540cb57556d3cc7e78704e6cd5100f5f",
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"lessThan": "52f1c45dde9136f964d63a77d19826c8a74e2c7f",
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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": "91ca7c5644c370dc5132b1db1aea81416a4b2181",
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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": "4.9.127",
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"lessThan": "4.9.334",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.14.70",
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"lessThan": "4.14.300",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.18.8",
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"lessThan": "4.19",
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"status": "affected",
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"versionType": "semver"
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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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"net/9p/trans_fd.c"
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],
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"versions": [
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{
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"version": "4.19",
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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": "4.19",
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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": "4.9.334",
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"lessThanOrEqual": "4.9.*",
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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": "4.14.300",
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"lessThanOrEqual": "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": "4.19.267",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.225",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.156",
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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": "5.15.80",
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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": "6.0.10",
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"lessThanOrEqual": "6.0.*",
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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",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.9.127",
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"versionEndExcluding": "4.9.334"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/82825dbf393f7c7979d462f9609a15bde8092b3f"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3031280fe4eaf61a09e60823331f81f321be8e1"
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},
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{
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"url": "https://git.kernel.org/stable/c/fec1406f5e7ab20b71f6d231792b0040e3300aaf"
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},
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{
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"url": "https://git.kernel.org/stable/c/96760723aae1b45f733f702abb4333137143909f"
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},
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{
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"url": "https://git.kernel.org/stable/c/f14858bc77c567e089965962877ee726ffad0556"
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},
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{
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"url": "https://git.kernel.org/stable/c/a4f1a01b2e81378fce9ca528d4d8a049e4b58fcd"
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},
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{
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"url": "https://git.kernel.org/stable/c/612c977f5d481f551d03d83d0aef588845c1300c"
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},
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{
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"url": "https://git.kernel.org/stable/c/52f1c45dde9136f964d63a77d19826c8a74e2c7f"
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}
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],
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"title": "9p: trans_fd/p9_conn_cancel: drop client lock earlier",
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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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}
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} |