CVE-2022-50315 (GCVE-0-2022-50315)
Vulnerability from cvelistv5
Published
2025-09-15 14:46
Modified
2026-10-15 21:31
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS
UBSAN complains about array-index-out-of-bounds:
[ 1.980703] kernel: UBSAN: array-index-out-of-bounds in /build/linux-9H675w/linux-5.15.0/drivers/ata/libahci.c:968:41
[ 1.980709] kernel: index 15 is out of range for type 'ahci_em_priv [8]'
[ 1.980713] kernel: CPU: 0 PID: 209 Comm: scsi_eh_8 Not tainted 5.15.0-25-generic #25-Ubuntu
[ 1.980716] kernel: Hardware name: System manufacturer System Product Name/P5Q3, BIOS 1102 06/11/2010
[ 1.980718] kernel: Call Trace:
[ 1.980721] kernel: <TASK>
[ 1.980723] kernel: show_stack+0x52/0x58
[ 1.980729] kernel: dump_stack_lvl+0x4a/0x5f
[ 1.980734] kernel: dump_stack+0x10/0x12
[ 1.980736] kernel: ubsan_epilogue+0x9/0x45
[ 1.980739] kernel: __ubsan_handle_out_of_bounds.cold+0x44/0x49
[ 1.980742] kernel: ahci_qc_issue+0x166/0x170 [libahci]
[ 1.980748] kernel: ata_qc_issue+0x135/0x240
[ 1.980752] kernel: ata_exec_internal_sg+0x2c4/0x580
[ 1.980754] kernel: ? vprintk_default+0x1d/0x20
[ 1.980759] kernel: ata_exec_internal+0x67/0xa0
[ 1.980762] kernel: sata_pmp_read+0x8d/0xc0
[ 1.980765] kernel: sata_pmp_read_gscr+0x3c/0x90
[ 1.980768] kernel: sata_pmp_attach+0x8b/0x310
[ 1.980771] kernel: ata_eh_revalidate_and_attach+0x28c/0x4b0
[ 1.980775] kernel: ata_eh_recover+0x6b6/0xb30
[ 1.980778] kernel: ? ahci_do_hardreset+0x180/0x180 [libahci]
[ 1.980783] kernel: ? ahci_stop_engine+0xb0/0xb0 [libahci]
[ 1.980787] kernel: ? ahci_do_softreset+0x290/0x290 [libahci]
[ 1.980792] kernel: ? trace_event_raw_event_ata_eh_link_autopsy_qc+0xe0/0xe0
[ 1.980795] kernel: sata_pmp_eh_recover.isra.0+0x214/0x560
[ 1.980799] kernel: sata_pmp_error_handler+0x23/0x40
[ 1.980802] kernel: ahci_error_handler+0x43/0x80 [libahci]
[ 1.980806] kernel: ata_scsi_port_error_handler+0x2b1/0x600
[ 1.980810] kernel: ata_scsi_error+0x9c/0xd0
[ 1.980813] kernel: scsi_error_handler+0xa1/0x180
[ 1.980817] kernel: ? scsi_unjam_host+0x1c0/0x1c0
[ 1.980820] kernel: kthread+0x12a/0x150
[ 1.980823] kernel: ? set_kthread_struct+0x50/0x50
[ 1.980826] kernel: ret_from_fork+0x22/0x30
[ 1.980831] kernel: </TASK>
This happens because sata_pmp_init_links() initialize link->pmp up to
SATA_PMP_MAX_PORTS while em_priv is declared as 8 elements array.
I can't find the maximum Enclosure Management ports specified in AHCI
spec v1.3.1, but "12.2.1 LED message type" states that "Port Multiplier
Information" can utilize 4 bits, which implies it can support up to 16
ports. Hence, use SATA_PMP_MAX_PORTS as EM_MAX_SLOTS to resolve the
issue.
BugLink: https://bugs.launchpad.net/bugs/1970074
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee Version: 18f7ba4c2f4be6b37d925931f04d6cc28d88d1ee |
||
{
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"id": "CVE-2022-50315",
"options": [
{
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{
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{
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"role": "CISA Coordinator",
"timestamp": "2026-10-15T21:30:53.570401Z",
"version": "2.0.3"
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"type": "ssvc"
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"providerMetadata": {
"dateUpdated": "2026-10-15T21:31:19.964Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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"cna": {
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"product": "Linux",
"programFiles": [
"drivers/ata/ahci.h"
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"vendor": "Linux",
"versions": [
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"version": "0",
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"status": "unaffected",
"version": "4.9.332",
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{
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"status": "unaffected",
"version": "4.14.298",
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{
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{
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"version": "5.4.221",
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{
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"version": "5.10.152",
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{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.76",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"versionEndExcluding": "4.9.332",
"versionStartIncluding": "2.6.27",
"vulnerable": true
},
{
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{
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{
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"vulnerable": true
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{
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{
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{
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{
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"versionEndExcluding": "6.1",
"versionStartIncluding": "2.6.27",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS\n\nUBSAN complains about array-index-out-of-bounds:\n[ 1.980703] kernel: UBSAN: array-index-out-of-bounds in /build/linux-9H675w/linux-5.15.0/drivers/ata/libahci.c:968:41\n[ 1.980709] kernel: index 15 is out of range for type \u0027ahci_em_priv [8]\u0027\n[ 1.980713] kernel: CPU: 0 PID: 209 Comm: scsi_eh_8 Not tainted 5.15.0-25-generic #25-Ubuntu\n[ 1.980716] kernel: Hardware name: System manufacturer System Product Name/P5Q3, BIOS 1102 06/11/2010\n[ 1.980718] kernel: Call Trace:\n[ 1.980721] kernel: \u003cTASK\u003e\n[ 1.980723] kernel: show_stack+0x52/0x58\n[ 1.980729] kernel: dump_stack_lvl+0x4a/0x5f\n[ 1.980734] kernel: dump_stack+0x10/0x12\n[ 1.980736] kernel: ubsan_epilogue+0x9/0x45\n[ 1.980739] kernel: __ubsan_handle_out_of_bounds.cold+0x44/0x49\n[ 1.980742] kernel: ahci_qc_issue+0x166/0x170 [libahci]\n[ 1.980748] kernel: ata_qc_issue+0x135/0x240\n[ 1.980752] kernel: ata_exec_internal_sg+0x2c4/0x580\n[ 1.980754] kernel: ? vprintk_default+0x1d/0x20\n[ 1.980759] kernel: ata_exec_internal+0x67/0xa0\n[ 1.980762] kernel: sata_pmp_read+0x8d/0xc0\n[ 1.980765] kernel: sata_pmp_read_gscr+0x3c/0x90\n[ 1.980768] kernel: sata_pmp_attach+0x8b/0x310\n[ 1.980771] kernel: ata_eh_revalidate_and_attach+0x28c/0x4b0\n[ 1.980775] kernel: ata_eh_recover+0x6b6/0xb30\n[ 1.980778] kernel: ? ahci_do_hardreset+0x180/0x180 [libahci]\n[ 1.980783] kernel: ? ahci_stop_engine+0xb0/0xb0 [libahci]\n[ 1.980787] kernel: ? ahci_do_softreset+0x290/0x290 [libahci]\n[ 1.980792] kernel: ? trace_event_raw_event_ata_eh_link_autopsy_qc+0xe0/0xe0\n[ 1.980795] kernel: sata_pmp_eh_recover.isra.0+0x214/0x560\n[ 1.980799] kernel: sata_pmp_error_handler+0x23/0x40\n[ 1.980802] kernel: ahci_error_handler+0x43/0x80 [libahci]\n[ 1.980806] kernel: ata_scsi_port_error_handler+0x2b1/0x600\n[ 1.980810] kernel: ata_scsi_error+0x9c/0xd0\n[ 1.980813] kernel: scsi_error_handler+0xa1/0x180\n[ 1.980817] kernel: ? scsi_unjam_host+0x1c0/0x1c0\n[ 1.980820] kernel: kthread+0x12a/0x150\n[ 1.980823] kernel: ? set_kthread_struct+0x50/0x50\n[ 1.980826] kernel: ret_from_fork+0x22/0x30\n[ 1.980831] kernel: \u003c/TASK\u003e\n\nThis happens because sata_pmp_init_links() initialize link-\u003epmp up to\nSATA_PMP_MAX_PORTS while em_priv is declared as 8 elements array.\n\nI can\u0027t find the maximum Enclosure Management ports specified in AHCI\nspec v1.3.1, but \"12.2.1 LED message type\" states that \"Port Multiplier\nInformation\" can utilize 4 bits, which implies it can support up to 16\nports. Hence, use SATA_PMP_MAX_PORTS as EM_MAX_SLOTS to resolve the\nissue.\n\nBugLink: https://bugs.launchpad.net/bugs/1970074"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The OOB is reached through AHCI enclosure-management paths on systems with a SATA port multiplier (common on NAS/DAS and eSATA setups). A local attacker triggers it via world-readable sysfs (em_message) and normal ATA/PMP command processing, without needing network access.\nAC:L - Once an AHCI host with enclosure management and a PMP is present, the out-of-bounds em_priv[link-\u003epmp] access is deterministic on PMP attach, LED sysfs reads, port resume, and I/O\u2014no race or other attacker-uncontrollable condition is required.\nPR:L - em_message is S_IRUGO, so an unprivileged local user can force OOB reads of adjacent kernel heap via ahci_led_show for PMP port indices \u003e= 8. Port resume and related EM paths that write past em_priv[] also do not require root capabilities beyond normal local access.\nUI:N - Exploitation does not need a victim to open a file or mount anything; attaching/operating the PMP and reading host sysfs attributes is sufficient, and the bug also fires from kernel EH/resume context without user interaction.\nS:U - Impact is confined to the host kernel\u2019s memory and control flow (heap OOB in ahci_port_priv). There is no VM/hypervisor escape or other cross-authority boundary crossing.\nC:H - ahci_led_show and related EM paths read em_priv[link-\u003epmp] past the 8-slot array into adjacent heap and return those values to userspace, enabling disclosure of kernel memory; heap corruption from the write paths can further yield arbitrary read primitives.\nI:H - For PMP indices \u003e= 8, ahci_init_sw_activity performs OOB writes (including timer_setup of a timer_list) into memory past em_priv[], and ahci_sw_activity/ahci_activity_store can likewise corrupt adjacent heap\u2014classic primitives for control-flow hijacking.\nA:H - Out-of-bounds heap reads/writes and corrupted timer_list state can oops/panic the kernel; the same paths run in SCSI error-handler/resume context where memory corruption reliably threatens system availability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:58:09.941Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f70bd4339cb68bc7e206af4c922bc0d249244403"
},
{
"url": "https://git.kernel.org/stable/c/da2ea4a961d9f89ed248734e7032350c260dc3a3"
},
{
"url": "https://git.kernel.org/stable/c/67a00c299c5c143817c948fbc7de1a2fa1af38fb"
},
{
"url": "https://git.kernel.org/stable/c/383b7c50f5445ff8dbbf03080905648d6980c39d"
},
{
"url": "https://git.kernel.org/stable/c/303d0f761431d848dd8d7ff9fd9b8c101879cabe"
},
{
"url": "https://git.kernel.org/stable/c/8fbe13de1cc7cef2564be3cbf60400b33eee023b"
},
{
"url": "https://git.kernel.org/stable/c/d6314d5f68764550c84d732ce901ddd3ac6b415f"
},
{
"url": "https://git.kernel.org/stable/c/1e41e693f458eef2d5728207dbd327cd3b16580a"
}
],
"title": "ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50315",
"datePublished": "2025-09-15T14:46:10.177Z",
"dateReserved": "2025-09-15T14:18:36.813Z",
"dateUpdated": "2026-10-15T21:31:19.964Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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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