221 lines
11 KiB
JSON
221 lines
11 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-2024-26734",
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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": "2024-02-19T14:20:24.165Z",
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"datePublished": "2024-04-03T17:00:21.162Z",
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"dateUpdated": "2026-08-05T11:26:53.941Z"
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},
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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\ndevlink: fix possible use-after-free and memory leaks in devlink_init()\n\nThe pernet operations structure for the subsystem must be registered\nbefore registering the generic netlink family.\n\nMake an unregister in case of unsuccessful registration."
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}
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],
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"baseScore": 7,
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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 resulting dangling `struct net` pointer is only reached through the devlink generic-netlink family from a local AF_NETLINK socket (`devlinks_xa_find_get()` → `devlink_net()`), with no remote protocol involvement. Netlink-reachable kernel state is scored Local.\nAC:H - The vulnerable state only exists if a registration inside the boot-time `subsys_initcall` `devlink_init()` fails, which depends on early-boot allocation conditions entirely outside attacker influence — and in practice `register_pernet_subsys()` on `.pre_exit`-only ops and `register_netdevice_notifier()` on an always-`NOTIFY_OK` handler cannot fail at all.\nPR:L - Once the pernet `pre_exit` hook is missing, the stale `devlink->_net` is dereferenced from `DEVLINK_CMD_*_GET`/dump handlers that carry no `GENL_ADMIN_PERM`, so any unprivileged local user with a netlink socket can touch the freed pointer.\nUI:N - Triggering the devlink netlink query that dereferences the dangling namespace pointer requires no action by any other user or administrator.\nS:U - The corruption and its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A use-after-free on a freed `struct net` lets an attacker reclaim the slab with controlled data and read back kernel memory through devlink's namespace-filtered dump paths.\nI:H - The same use-after-free permits heap spraying of the freed `struct net`, yielding attacker-influenced writes through the reference-counting and reload paths that operate on it, which is exploitable toward control-flow hijack.\nA:H - Dereferencing a freed network namespace reliably produces an oops or panic, and the unbalanced registrations additionally leak kernel memory."
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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/devlink/core.c"
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],
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"programFiles": [
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"net/devlink/core.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "6.3",
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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": "6.6.19",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.7.7",
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"lessThanOrEqual": "6.7.*",
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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": "6.8",
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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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"title": "devlink: fix possible use-after-free and memory leaks in devlink_init()",
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