net: macb: fix use-after-free access to PTP clock
In the Linux kernel, the following vulnerability has been resolved: net: macb: fix use-after-free access to PTP clock PTP clock is registered on every opening of the interface and destroyed on every closing. However it may be accessed via get_ts_info ethtool call which is possible while the interface is just present in the kernel. BUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 Read of size 4 at addr ffff8880194345cc by task syz.0.6/948 CPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x17f/0x496 mm/kasan/report.c:420 kasan_report+0xd9/0x180 mm/kasan/report.c:524 ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349 macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371 __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558 ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline] __dev_ethtool net/ethtool/ioctl.c:3017 [inline] dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095 dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510 sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215 sock_ioctl+0x577/0x6d0 net/socket.c:1320 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c
CVE-2026-31396
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31396
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "8820ffe0975fd2efbe50453e9179c8e1c33a13d3",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "6b757f345eeea87ed5d8afd6de35b927a1a57a2f",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "341d01087f821aa0f165fb1ffc8bfe4e50776da7",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "5653af416a48f6c18f9626ae9df96f814f45ff34",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "0bb848d8c64938024e45780f8032f1f67d3a3607",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "1f4714065b2bcbb0a4013fd355b84b848e6cc345",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "eb652535e9ec795ef5c1078f7578eaaed755268b",
"versionType": "git"
},
{
"status": "affected",
"version": "c2594d804d5c8033861d44840673d852d98508c1",
"lessThan": "8da13e6d63c1a97f7302d342c89c4a56a55c7015",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/cadence/macb_ptp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/cadence/macb_ptp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31396
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28266 · Revision 1
- Added to Heist Feed
- Publisher date