# CVE-2022-49390: linux: In the Linux kernel, the following vulnerability has been resolved:  macsec: fix UAF bug for real_dev  Create a new m...

CVE-2022-49390 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49390, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49390
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  macsec: fix UAF bug for real_dev  Create a new macsec device but not get reference to real_dev. That can not ensure that real_dev is freed after macsec. That will trigger the UAF bug for real_dev as following:  ================================================================== BUG: KASAN: use-after-free in macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662 Call Trace:  ...  macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662  dev_get_iflink+0x73/0xe0 net/core/dev.c:637  default_operstate net/core/link_watch.c:42 [inline]  rfc2863_policy+0x233/0x2d0 net/core/link_watch.c:54  linkwatch_do_dev+0x2a/0x150 net/core/link_watch.c:161  Allocated by task 22209:  ...  alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10549  rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3235  veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748  Freed by task 8:  ...  kfree+0xd6/0x4d0 mm/slub.c:4552  kvfree+0x42/0x50 mm/util.c:615  device_release+0x9f/0x240 drivers/base/core.c:2229  kobject_cleanup lib/kobject.c:673 [inline]  kobject_release lib/kobject.c:704 [inline]  kref_put include/linux/kref.h:65 [inline]  kobject_put+0x1c8/0x540 lib/kobject.c:721  netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10327  After commit faab39f63c1f ("net: allow out-of-order netdev unregistration") and commit e5f80fcf869a ("ipv6: give an IPv6 dev to blackhole_netdev"), we can add dev_hold_track() in macsec_dev_init() and dev_put_track() in macsec_free_netdev() to fix the problem.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49390](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49390.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49390](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49390.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49390](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49390.md) | Feb 26, 2025 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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