260 lines
13 KiB
JSON
260 lines
13 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-2022-48816",
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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": "2024-07-16T11:38:08.900Z",
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"datePublished": "2024-07-16T11:44:04.654Z",
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"dateUpdated": "2026-10-03T10:54:45.862Z"
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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": "2026-10-03T10:54:45.862Z"
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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\nSUNRPC: lock against ->sock changing during sysfs read\n\n->sock can be set to NULL asynchronously unless ->recv_mutex is held.\nSo it is important to hold that mutex. Otherwise a sysfs read can\ntrigger an oops.\nCommit 17f09d3f619a (\"SUNRPC: Check if the xprt is connected before\nhandling sysfs reads\") appears to attempt to fix this problem, but it\nonly narrows the race window."
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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:H",
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"baseScore": 7.8,
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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 - The vulnerable path is reached only by reading world-readable SUNRPC sysfs attributes under /sys/kernel/sunrpc/xprt-switches/*/xprt-*/{srcaddr,xprt_info}, which requires local process access and is not reachable via network packets or adjacent-link protocols.\nAC:L - An unprivileged attacker can continuously poll those attributes while inducing concurrent transport teardown (NFS automount idle unmount, peer RST/reconnect storms, or forced disconnect), controlling both sides of the race and retrying until sock is observed NULL or freed mid-getsockname.\nPR:L - srcaddr is mode 0644 and xprt_info is 0444 with no capability check on the show path, and /sys/kernel/sunrpc directories are world-traversable, so a normal local user can trigger the vulnerable reads without root or init-namespace privileges.\nUI:N - The attacker performs the sysfs reads and can drive teardown/reconnect themselves; no separate victim action such as opening a crafted file or mounting a filesystem is required at exploit time.\nS:U - Impact is confined to the local host kernel (oops or socket UAF within SUNRPC/socket heap state) and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Without recv_mutex, a non-NULL sock pointer can be loaded then used after xs_reset_transport()'s fput frees the socket, a classic socket UAF that heap spraying can turn into arbitrary kernel memory disclosure.\nI:H - The same unlocked race allows use-after-free of the struct socket while kernel_getsockname/xs_sock_getport runs, enabling reclaim and corruption of adjacent heap state for arbitrary write and control-flow hijacking under standard UAF exploitation.\nA:H - The documented failure mode is a kernel oops from NULL sock dereference during sysfs read, and the UAF path likewise crashes on stale socket use, so availability impact is High 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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"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/sunrpc/sysfs.c",
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"net/sunrpc/xprtsock.c"
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],
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},
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"version": "5.16.10",
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"lessThanOrEqual": "5.16.*",
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"status": "unaffected",
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"version": "5.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"id": "CVE-2022-48816",
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"role": "CISA Coordinator",
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"options": [
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{
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