222 lines
12 KiB
JSON
222 lines
12 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-2026-90104",
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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": "2026-09-11T19:38:34.786Z",
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"datePublished": "2026-09-17T16:06:14.191Z",
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"dateUpdated": "2026-10-30T12:34:08.837Z"
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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": "2026-10-30T12:34:08.837Z"
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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\nNFSv4.1: zero referring call lists before decoding\n\ndecode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so\neach referring_call_list starts uninitialized. decode_rc_list() assigns\nrcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero\nreferring calls therefore leaves the pointer uninitialized, and\nnfs4_callback_sequence() later passes stale slab contents to kfree().\n\nAllocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is\nNULL from the beginning, including valid empty referring call lists."
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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 - xs_read_stream_call()/rpcrdma_bc_receive_call() deliver a backchannel RPC_CALL on the established NFSv4.1 TCP or RPC/RDMA session into nfs4_callback_compound → process_op → decode_cb_sequence_args(); the attacker-controlled bytes are the CB_SEQUENCE csa_nrclists and rcl_nrefcalls XDR fields sent by the NFS server.\nAC:L - A single well-formed CB_SEQUENCE with csa_nrclists≥1 and decode_rc_list() seeing rcl_nrefcalls==0 skips the rcl_refcalls assignment and still returns 0; nfs4_callback_sequence() then kfree()s that stale pointer. Empty referring_call_list4 is valid RFC 5661 XDR, so no race or victim-only state is required.\nPR:N - nfs_callback_authenticate() accepts RPC_AUTH_UNIX on the NFSv4.1 backchannel, and decode_cb_sequence_args() runs in process_op() before nfs4_find_client_sessionid(); the connected NFS server needs no account or capability on the client to send CB_SEQUENCE.\nUI:N - After nfs4_init_callback() has attached the backchannel (boot-time, autofs, or Kubernetes NFSv4.1 mounts), the server unilaterally sends CB_SEQUENCE; nfs4_callback_sequence() kfree()s rcl_refcalls with no further victim open, mount, or click.\nS:U - kfree of the stale rcl_refcalls pointer corrupts the NFS client's kmalloc heap in the same host kernel; it does not cross a VM, IOMMU, or guest/host boundary.\nC:H - nfs4_callback_sequence() kfree()s uninitialized rcl_refcalls left by kmalloc_objs() of csa_rclists when rcl_nrefcalls was 0. A prior CB_SEQUENCE that allocated then freed rcl_refcalls can leave that pointer in the reused slab object, a heap double-free/UAF read primitive.\nI:H - The same kfree of stale rcl_refcalls is a slab double-free of the referring_call array (size chosen by the attacker's earlier nrefcalls). Reclaim or spraying a replacement object over that free yields an arbitrary kernel write / control-flow hijack primitive.\nA:H - kfree of a non-NULL garbage rcl_refcalls pointer from a successful decode_cb_sequence_args() of an empty referring_call_list causes SLUB to BUG, oops, or panic even when the double-free is not fully exploited."
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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/callback_xdr.c"
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],
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"versions": [
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{
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"version": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "810f6b3a29ac96fdc16909132b31627dae6824c2",
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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": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "ed54460caf5b5aa65ec03c9a6032d831f39f19f5",
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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": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "7510a5b9edec9d9536a4e69f10edfb2592e6cf7f",
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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": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "f4d23937e1c41995c2f54af26c89b5e48a41c299",
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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": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "f31f3c042e024aef437cda42f0424ae8d4594b6c",
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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": "4aece6a19cf7f474f15eb861ba74db4479884ce3",
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"lessThan": "8fa4804fe62ca4155a2d8fc2789d630376cbf2fc",
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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/callback_xdr.c"
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],
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"versions": [
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{
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"version": "2.6.31",
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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": "2.6.31",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.114",
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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": "6.18.57",
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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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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.31",
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"versionEndExcluding": "6.1.191"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/810f6b3a29ac96fdc16909132b31627dae6824c2"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed54460caf5b5aa65ec03c9a6032d831f39f19f5"
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},
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{
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"url": "https://git.kernel.org/stable/c/7510a5b9edec9d9536a4e69f10edfb2592e6cf7f"
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{
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"url": "https://git.kernel.org/stable/c/f4d23937e1c41995c2f54af26c89b5e48a41c299"
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{
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"url": "https://git.kernel.org/stable/c/f31f3c042e024aef437cda42f0424ae8d4594b6c"
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},
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{
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"url": "https://git.kernel.org/stable/c/8fa4804fe62ca4155a2d8fc2789d630376cbf2fc"
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}
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],
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"title": "NFSv4.1: zero referring call lists before decoding",
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