268 lines
15 KiB
JSON
268 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-2026-90151",
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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": "2026-09-11T19:38:34.789Z",
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"datePublished": "2026-09-17T16:06:44.987Z",
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"dateUpdated": "2026-10-19T08:58:50.239Z"
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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": "2026-10-19T08:58:50.239Z"
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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\nNFSv4: remove callback IDR entry on client allocation failure\n\nnfs4_alloc_client() allocates an NFSv4.0 callback identifier before it\nfinishes setting up the client. If any later initialization step fails,\nthe error path frees the nfs_client directly with nfs_free_client(). That\nbypasses nfs_put_client(), which is where the callback IDR entry is\nremoved during normal teardown.\n\nA failed allocation can therefore leave cb_ident_idr pointing at a freed\nnfs_client. A later NFSv4.0 callback lookup by cb_ident would find the\nstale pointer and take a reference to it.\n\nMake the callback IDR removal helper callable by the allocation failure\npath, and remove the callback identifier before freeing the client.\n\nThis was found by a local static-analysis checker for publish-before-free\nlifetime bugs and confirmed by manual inspection."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - nfs4_find_client_ident() is called from nfs4_callback_compound() with hdr_arg.cb_ident taken by decode_compound_hdr_arg() from an NFSv4.0 CB_COMPOUND on the TCP callback listener that nfs4_callback_up_net() binds to INADDR_ANY via svc_xprt_create(); the remote peer supplies that identifier over routable TCP.\nAC:L - A malicious NFSv4.0 server keeps the callback service up, then forces a later nfs4_alloc_client() to fail after nfs_get_cb_ident_idr() by making rpc_create()/rpc_ping() fail in nfs_create_rpc_client() (nfs4_create_referral_server or nfs4_update_server to an RST-ing address), then sends CB_COMPOUND with the next sequential idr id; no uncontrolled race is required.\nPR:N - nfs4_find_client_ident() runs in nfs4_callback_compound() before check_gss_callback_principal(), and nfs_callback_authenticate() accepts RPC_AUTH_UNIX for CB_COMPOUND, so the peer needs no account or capability on the victim client.\nUI:N - The same peer returns NFS4ERR_MOVED so nfs4_schedule_migration_recovery() or a LOOKUP referral (nfs4_create_referral_server) runs nfs4_alloc_client() from the state manager or automount, then sends the CB_COMPOUND itself; no extra victim mount dialog or file-open is required.\nS:U - The UAF is of an nfs_client published in cb_ident_idr and freed by nfs_free_client(); impact stays in the host kernel and does not cross a VM, IOMMU, or guest/host boundary.\nC:H - nfs4_find_client_ident() does refcount_inc(&clp->cl_count) on the nfs_client that nfs_free_client() already kfree_rcu'd, so a stale cb_ident_idr pointer remains; reclaim of that heap object yields an arbitrary kernel read, as with other kernel UAFs.\nI:H - The same stale-IDR lookup is a use-after-free write (refcount_inc, then nfs_put_client list_del and field access in check_gss_callback_principal/process_op); spraying the freed nfs_client enables arbitrary write and control-flow hijack.\nA:H - refcount_inc on the kfree_rcu'd nfs_client, or later dereference of cl_rpcclient left as ERR_PTR(-EINVAL) when nfs_create_rpc_client() failed, causes a kernel oops/panic even without a full exploit."
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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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"fs/nfs/client.c",
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"fs/nfs/internal.h",
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"fs/nfs/nfs4client.c"
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],
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"versions": [
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{
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"version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "68c721391b761dbe38d5b0094d2bb6e8489ad92b",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "9bfdd0f591307b5198826a0e7a5b2f35f87acd2d",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "7c4812eb96bdcafb31a65b12f2aa96659429d1d4",
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"status": "affected",
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},
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{
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"version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "fc95ca82d5ae598c428ab5a00ae69f8526d59371",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "80b1c3d5a881f7d9081aa9f46da9742878a0f893",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "3f2387e8bfbc4efda5d77c3a11a028d0a119c48f",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "5891c03e150920618db0e9c4ea2d772abacdcfd1",
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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": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
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"lessThan": "d05c2007b3d84ccba11dc6e9cb3202768cc72f14",
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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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"fs/nfs/client.c",
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"fs/nfs/internal.h",
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"fs/nfs/nfs4client.c"
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],
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"versions": [
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{
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"version": "2.6.38",
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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": "2.6.38",
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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": "5.10.270",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"versionStartIncluding": "2.6.38",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.6.157"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b"
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},
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{
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"url": "https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d"
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},
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{
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"url": "https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4"
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},
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{
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"url": "https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371"
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},
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{
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"url": "https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f"
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},
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{
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"url": "https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1"
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},
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{
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"url": "https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14"
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}
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],
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"title": "NFSv4: remove callback IDR entry on client allocation failure",
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"x_generator": {
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} |