319 lines
18 KiB
JSON
319 lines
18 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-2025-39994",
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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": "2025-04-16T07:20:57.150Z",
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"datePublished": "2025-10-15T07:58:19.503Z",
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"dateUpdated": "2026-10-15T22:02:35.851Z"
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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": "2026-08-05T12:06:59.351Z"
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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\nmedia: tuner: xc5000: Fix use-after-free in xc5000_release\n\nThe original code uses cancel_delayed_work() in xc5000_release(), which\ndoes not guarantee that the delayed work item timer_sleep has fully\ncompleted if it was already running. This leads to use-after-free scenarios\nwhere xc5000_release() may free the xc5000_priv while timer_sleep is still\nactive and attempts to dereference the xc5000_priv.\n\nA typical race condition is illustrated below:\n\nCPU 0 (release thread) | CPU 1 (delayed work callback)\nxc5000_release() | xc5000_do_timer_sleep()\n cancel_delayed_work() |\n hybrid_tuner_release_state(priv) |\n kfree(priv) |\n | priv = container_of() // UAF\n\nReplace cancel_delayed_work() with cancel_delayed_work_sync() to ensure\nthat the timer_sleep is properly canceled before the xc5000_priv memory\nis deallocated.\n\nA deadlock concern was considered: xc5000_release() is called in a process\ncontext and is not holding any locks that the timer_sleep work item might\nalso need. Therefore, the use of the _sync() variant is safe here.\n\nThis bug was initially identified through static analysis.\n\n[hverkuil: fix typo in Subject: tunner -> tuner]"
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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:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.3,
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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 - Both halves are software-local: the attacker arms the 5-second `timer_sleep` work through the local `/dev/dvb/adapterN/frontend0` or `/dev/videoN` device node, and the freeing `dvb_frontend_detach()` path is entered by a local write to `/sys/bus/pci/devices/<dev>/remove`/`unbind` or `rmmod` on the PCIe xc5000 cards (cx23885, cx88, saa7134), with no network, adjacent-network, or remote-peer data path into `xc5000_release()`.\nAC:L - The attacker fully controls the arming side with deterministic timing — `dvb_shutdown_timeout` defaults to 0, so closing the frontend immediately triggers `xc5000_sleep()` and the work fires exactly 5 s later — and the callback then executes for roughly 350 ms on cx231xx boards (`msleep(10)+msleep(330)+msleep(10)` in `cx231xx_tuner_callback()`), an enormous window that can be re-armed indefinitely for free; once it is hit, `cancel_delayed_work()` cannot steal a running work item and the use-after-free is unconditional.\nPR:L - Arming the vulnerable work requires nothing more than opening and closing the DVB frontend or V4L2 video node, which systemd tags with `uaccess` (and which is group `video` on media appliances, set-top boxes and DVR/kiosk systems), so an ordinary unprivileged local account suffices; no capability, user namespace, or root is needed on the attacker-controlled side.\nUI:R - Completing the exploit needs the free itself, which only occurs on driver teardown — an administrator running `rmmod`/`unbind`, or a user unplugging the USB TV tuner — an action the unprivileged attacker cannot perform, so a separate user must act while the primed work is executing.\nS:U - The corruption is confined to kernel heap objects (the freed `struct xc5000_priv` and whatever reclaims its kmalloc-192 slot) within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `xc5000_do_timer_sleep()` reads `priv->fe` out of the freed slab and `xc5000_tuner_reset()` then dereferences `fe->dvb`, `fe->dvb->priv` and `priv->i2c_props.adap->algo_data`, so spraying the kmalloc-192 cache turns the dangling pointer into an arbitrary-address read chain and leaks kernel pointers that defeat KASLR.\nI:H - `xc5000_tuner_reset()` performs `fe->callback(...)` where `fe` was loaded from the freed object, giving a fully attacker-controlled indirect call with a controlled first argument once the slab is reclaimed — a direct control-flow hijack primitive, not merely a stray read.\nA:H - Dereferencing the freed `xc5000_priv` from workqueue context reliably produces a KASAN slab-use-after-free splat and an oops/panic (and the bogus function-pointer call faults in kernel context), taking the system down."
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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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"drivers/media/tuners/xc5000.c"
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],
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"versions": [
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"lessThan": "bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8",
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"drivers/media/tuners/xc5000.c"
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},
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},
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},
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"url": "https://git.kernel.org/stable/c/4266f012806fc18e46da4a04d130df59a4946f93"
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{
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"url": "https://git.kernel.org/stable/c/40b7a19f321e65789612ebaca966472055dab48c"
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}
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],
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"title": "media: tuner: xc5000: Fix use-after-free in xc5000_release",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-39994",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:55:59.194469Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:35.851Z"
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}
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}
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]
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}
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} |