CVE-2025-38593 (GCVE-0-2025-38593)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2025-08-19 17:03
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
Function 'hci_discovery_filter_clear()' frees 'uuids' array and then
sets it to NULL. There is a tiny chance of the following race:
'hci_cmd_sync_work()'
'update_passive_scan_sync()'
'hci_update_passive_scan_sync()'
'hci_discovery_filter_clear()'
kfree(uuids);
<-------------------------preempted-------------------------------->
'start_service_discovery()'
'hci_discovery_filter_clear()'
kfree(uuids); // DOUBLE FREE
<-------------------------preempted-------------------------------->
uuids = NULL;
To fix it let's add locking around 'kfree()' call and NULL pointer
assignment. Otherwise the following backtrace fires:
[ ] ------------[ cut here ]------------
[ ] kernel BUG at mm/slub.c:547!
[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1
[ ] Tainted: [O]=OOT_MODULE
[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ ] pc : __slab_free+0xf8/0x348
[ ] lr : __slab_free+0x48/0x348
...
[ ] Call trace:
[ ] __slab_free+0xf8/0x348
[ ] kfree+0x164/0x27c
[ ] start_service_discovery+0x1d0/0x2c0
[ ] hci_sock_sendmsg+0x518/0x924
[ ] __sock_sendmsg+0x54/0x60
[ ] sock_write_iter+0x98/0xf8
[ ] do_iter_readv_writev+0xe4/0x1c8
[ ] vfs_writev+0x128/0x2b0
[ ] do_writev+0xfc/0x118
[ ] __arm64_sys_writev+0x20/0x2c
[ ] invoke_syscall+0x68/0xf0
[ ] el0_svc_common.constprop.0+0x40/0xe0
[ ] do_el0_svc+0x1c/0x28
[ ] el0_svc+0x30/0xd0
[ ] el0t_64_sync_handler+0x100/0x12c
[ ] el0t_64_sync+0x194/0x198
[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)
[ ] ---[ end trace 0000000000000000 ]---
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/net/bluetooth/hci_core.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca",
"status": "affected",
"version": "ad383c2c65a5baf16e334cd40a013cc302176891",
"versionType": "git"
},
{
"lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799",
"status": "affected",
"version": "ad383c2c65a5baf16e334cd40a013cc302176891",
"versionType": "git"
},
{
"lessThan": "f8069f34c4c976786ded97498012225af87435d7",
"status": "affected",
"version": "ad383c2c65a5baf16e334cd40a013cc302176891",
"versionType": "git"
},
{
"lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
"status": "affected",
"version": "ad383c2c65a5baf16e334cd40a013cc302176891",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"include/net/bluetooth/hci_core.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"lessThan": "5.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"version": "6.15.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.42",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.15.10",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.1",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17-rc1",
"versionStartIncluding": "5.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027\n\nFunction \u0027hci_discovery_filter_clear()\u0027 frees \u0027uuids\u0027 array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n\u0027hci_cmd_sync_work()\u0027\n\n \u0027update_passive_scan_sync()\u0027\n\n \u0027hci_update_passive_scan_sync()\u0027\n\n \u0027hci_discovery_filter_clear()\u0027\n kfree(uuids);\n\n \u003c-------------------------preempted--------------------------------\u003e\n \u0027start_service_discovery()\u0027\n\n \u0027hci_discovery_filter_clear()\u0027\n kfree(uuids); // DOUBLE FREE\n\n \u003c-------------------------preempted--------------------------------\u003e\n\n uuids = NULL;\n\nTo fix it let\u0027s add locking around \u0027kfree()\u0027 call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ] __slab_free+0xf8/0x348\n[ ] kfree+0x164/0x27c\n[ ] start_service_discovery+0x1d0/0x2c0\n[ ] hci_sock_sendmsg+0x518/0x924\n[ ] __sock_sendmsg+0x54/0x60\n[ ] sock_write_iter+0x98/0xf8\n[ ] do_iter_readv_writev+0xe4/0x1c8\n[ ] vfs_writev+0x128/0x2b0\n[ ] do_writev+0xfc/0x118\n[ ] __arm64_sys_writev+0x20/0x2c\n[ ] invoke_syscall+0x68/0xf0\n[ ] el0_svc_common.constprop.0+0x40/0xe0\n[ ] do_el0_svc+0x1c/0x28\n[ ] el0_svc+0x30/0xd0\n[ ] el0t_64_sync_handler+0x100/0x12c\n[ ] el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"
}
],
"providerMetadata": {
"dateUpdated": "2025-08-19T17:03:18.960Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"
},
{
"url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"
},
{
"url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"
},
{
"url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"
}
],
"title": "Bluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-38593",
"datePublished": "2025-08-19T17:03:18.960Z",
"dateReserved": "2025-04-16T04:51:24.028Z",
"dateUpdated": "2025-08-19T17:03:18.960Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-38593\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:37.067\",\"lastModified\":\"2025-08-20T14:40:17.713\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027\\n\\nFunction \u0027hci_discovery_filter_clear()\u0027 frees \u0027uuids\u0027 array and then\\nsets it to NULL. There is a tiny chance of the following race:\\n\\n\u0027hci_cmd_sync_work()\u0027\\n\\n \u0027update_passive_scan_sync()\u0027\\n\\n \u0027hci_update_passive_scan_sync()\u0027\\n\\n \u0027hci_discovery_filter_clear()\u0027\\n kfree(uuids);\\n\\n \u003c-------------------------preempted--------------------------------\u003e\\n \u0027start_service_discovery()\u0027\\n\\n \u0027hci_discovery_filter_clear()\u0027\\n kfree(uuids); // DOUBLE FREE\\n\\n \u003c-------------------------preempted--------------------------------\u003e\\n\\n uuids = NULL;\\n\\nTo fix it let\u0027s add locking around \u0027kfree()\u0027 call and NULL pointer\\nassignment. Otherwise the following backtrace fires:\\n\\n[ ] ------------[ cut here ]------------\\n[ ] kernel BUG at mm/slub.c:547!\\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\\n[ ] Tainted: [O]=OOT_MODULE\\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n[ ] pc : __slab_free+0xf8/0x348\\n[ ] lr : __slab_free+0x48/0x348\\n...\\n[ ] Call trace:\\n[ ] __slab_free+0xf8/0x348\\n[ ] kfree+0x164/0x27c\\n[ ] start_service_discovery+0x1d0/0x2c0\\n[ ] hci_sock_sendmsg+0x518/0x924\\n[ ] __sock_sendmsg+0x54/0x60\\n[ ] sock_write_iter+0x98/0xf8\\n[ ] do_iter_readv_writev+0xe4/0x1c8\\n[ ] vfs_writev+0x128/0x2b0\\n[ ] do_writev+0xfc/0x118\\n[ ] __arm64_sys_writev+0x20/0x2c\\n[ ] invoke_syscall+0x68/0xf0\\n[ ] el0_svc_common.constprop.0+0x40/0xe0\\n[ ] do_el0_svc+0x1c/0x28\\n[ ] el0_svc+0x30/0xd0\\n[ ] el0t_64_sync_handler+0x100/0x12c\\n[ ] el0t_64_sync+0x194/0x198\\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\\n[ ] ---[ end trace 0000000000000000 ]---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: hci_sync: corrige la doble liberaci\u00f3n en \u0027hci_discovery_filter_clear()\u0027 La funci\u00f3n \u0027hci_discovery_filter_clear()\u0027 libera la matriz \u0027uuids\u0027 y luego la establece en NULL. Hay una peque\u00f1a posibilidad de la siguiente ejecuci\u00f3n: \u0027hci_cmd_sync_work()\u0027 \u0027update_passive_scan_sync()\u0027 \u0027hci_update_passive_scan_sync()\u0027 \u0027hci_discovery_filter_clear()\u0027 kfree(uuids); \u0026lt;-------------------------preempted--------------------------------\u0026gt; \u0027start_service_discovery()\u0027 \u0027hci_discovery_filter_clear()\u0027 kfree(uuids); // DOBLE LIBERACI\u00d3N \u0026lt;-------------------------preempted--------------------------------\u0026gt; uuids = NULL; Para solucionarlo, agreguemos un bloqueo alrededor de la llamada \u0027kfree()\u0027 y la asignaci\u00f3n del puntero NULL. De lo contrario, se activa el siguiente backtrace: [ ] ------------[ cortar aqu\u00ed ]------------ [ ] \u00a1ERROR del kernel en mm/slub.c:547! [ ] Error interno: Ups - ERROR: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]-]---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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