UBUNTU-CVE-2022-50578

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    UBUNTU-CVE-2022-50578

    Published: 22 Oct 2025Last Modified: 30 Sept 2026
    Upstream:
    CVE-2022-50578

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: class: fix possible memory leak in __class_register() If class_add_groups() returns error, the 'cp->subsys' need be unregister, and the 'cp' need be freed. We can not call kset_unregister() here, because the 'cls' will be freed in callback function class_release() and it's also freed in caller's error path, it will cause double free. So fix this by calling kobject_del() and kfree_const(name) to cleanup kobject. Besides, call kfree() to free the 'cp'. Fault injection test can trigger this: unreferenced object 0xffff888102fa8190 (size 8): comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 8 bytes): 70 6b 74 63 64 76 64 00 pktcdvd. backtrace: [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320 [<000000005e4d70bc>] kstrdup+0x3a/0x70 [<00000000c2e5e85a>] kstrdup_const+0x68/0x80 [<000000000049a8c7>] kvasprintf_const+0x10b/0x190 [<0000000029123163>] kobject_set_name_vargs+0x56/0x150 [<00000000747219c9>] kobject_set_name+0xab/0xe0 [<0000000005f1ea4e>] __class_register+0x15c/0x49a unreferenced object 0xffff888037274000 (size 1024): comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 32 bytes): 00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff .@'7.....@'7.... 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... backtrace: [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0 [<00000000ecf3dd95>] __class_register+0x86/0x49a

    References: https://ubuntu.com/security/CVE-2022-50578, https://www.cve.org/CVERecord?id=CVE-2022-50578, https://git.kernel.org/linus/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407, https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd, https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd, https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878, https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7, https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c, https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407, https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b, https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1

    Affected packages

    Package

    Name: linux-azure

    Purl: pkg:deb/ubuntu/linux-azure?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.15.0-1162.177~14.04.1

    Affected versions

    4.15.0-1023.24~14.04.1
    4.15.0-1030.31~14.04.1
    4.15.0-1031.32~14.04.1
    4.15.0-1032.33~14.04.2
    4.15.0-1035.36~14.04.2
    4.15.0-1036.38~14.04.2
    4.15.0-1037.39~14.04.2
    4.15.0-1039.41~14.04.2
    4.15.0-1040.44~14.04.1
    4.15.0-1041.45~14.04.1
    4.15.0-1042.46~14.04.1
    4.15.0-1045.49~14.04.1
    4.15.0-1046.50~14.04.1
    4.15.0-1047.51~14.04.1
    4.15.0-1049.54~14.04.1
    4.15.0-1050.55~14.04.1
    4.15.0-1051.56~14.04.1
    4.15.0-1052.57~14.04.1
    4.15.0-1055.60~14.04.1
    4.15.0-1056.61~14.04.1
    4.15.0-1057.62~14.04.1
    4.15.0-1059.64~14.04.1
    4.15.0-1060.65~14.04.1
    4.15.0-1061.66~14.04.1
    4.15.0-1063.68~14.04.1
    4.15.0-1064.69~14.04.1
    4.15.0-1066.71~14.04.1
    4.15.0-1067.72~14.04.1
    4.15.0-1069.74~14.04.1
    4.15.0-1071.76~14.04.1
    4.15.0-1074.79~14.04.1
    4.15.0-1077.82~14.04.1
    4.15.0-1082.92~14.04.1
    4.15.0-1083.93~14.04.1
    4.15.0-1089.99~14.04.1
    4.15.0-1091.101~14.04.1
    4.15.0-1092.102~14.04.1
    4.15.0-1093.103~14.04.1
    4.15.0-1095.105~14.04.1
    4.15.0-1096.106~14.04.1
    4.15.0-1098.109~14.04.1
    4.15.0-1100.111~14.04.1
    4.15.0-1102.113~14.04.1
    4.15.0-1103.114~14.04.1
    4.15.0-1106.118~14.04.1
    4.15.0-1108.120~14.04.1
    4.15.0-1109.121~14.04.1
    4.15.0-1110.122~14.04.1
    4.15.0-1111.123~14.04.1
    4.15.0-1112.124~14.04.1
    4.15.0-1113.126~14.04.1
    4.15.0-1114.127~14.04.1
    4.15.0-1115.128~14.04.1
    4.15.0-1118.131~14.04.1
    4.15.0-1121.134~14.04.1
    4.15.0-1122.135~14.04.1
    4.15.0-1123.136~14.04.1
    4.15.0-1124.137~14.04.1
    4.15.0-1125.138~14.04.1
    4.15.0-1126.139~14.04.1
    4.15.0-1127.140~14.04.1
    4.15.0-1129.142~14.04.1
    4.15.0-1130.143~14.04.1
    4.15.0-1131.144~14.04.1
    4.15.0-1133.146~14.04.1
    4.15.0-1134.147~14.04.1
    4.15.0-1136.149~14.04.1
    4.15.0-1137.150~14.04.1
    4.15.0-1138.151~14.04.1
    4.15.0-1139.152~14.04.1
    4.15.0-1142.156~14.04.1
    4.15.0-1145.160~14.04.1
    4.15.0-1146.161~14.04.1
    4.15.0-1149.164~14.04.1
    4.15.0-1150.165~14.04.1
    4.15.0-1151.166~14.04.1
    4.15.0-1153.168~14.04.1
    4.15.0-1157.172~14.04.2
    4.15.0-1158.173~14.04.1
    4.15.0-1159.174~14.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2022-50578 | CVE-DB