CVE-2022-49784

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49784
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49784.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-49784
Downstream
Related
Published
2025-05-01T14:09:17Z
Modified
2025-10-13T20:44:48.489953Z
Summary
perf/x86/amd/uncore: Fix memory leak for events array
Details

In the Linux kernel, the following vulnerability has been resolved:

perf/x86/amd/uncore: Fix memory leak for events array

When a CPU comes online, the per-CPU NB and LLC uncore contexts are freed but not the events array within the context structure. This causes a memory leak as identified by the kmemleak detector.

[...] unreferenced object 0xffff8c5944b8e320 (size 32): comm "swapper/0", pid 1, jiffies 4294670387 (age 151.072s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000000759fb79>] amduncorecpuupprepare+0xaf/0x230 [<00000000ddc9e126>] cpuhpinvokecallback+0x2cf/0x470 [<0000000093e727d4>] cpuhpissuecall+0x14d/0x170 [<0000000045464d54>] _cpuhpsetupstatecpuslocked+0x11e/0x330 [<0000000069f67cbd>] _cpuhpsetupstate+0x6b/0x110 [<0000000015365e0f>] amduncoreinit+0x260/0x321 [<00000000089152d2>] dooneinitcall+0x3f/0x1f0 [<000000002d0bd18d>] kernelinitfreeable+0x1ca/0x212 [<0000000030be8dde>] kernelinit+0x11/0x120 [<0000000059709e59>] retfromfork+0x22/0x30 unreferenced object 0xffff8c5944b8dd40 (size 64): comm "swapper/0", pid 1, jiffies 4294670387 (age 151.072s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000306efe8b>] amduncorecpuupprepare+0x183/0x230 [<00000000ddc9e126>] cpuhpinvokecallback+0x2cf/0x470 [<0000000093e727d4>] cpuhpissuecall+0x14d/0x170 [<0000000045464d54>] _cpuhpsetupstatecpuslocked+0x11e/0x330 [<0000000069f67cbd>] _cpuhpsetupstate+0x6b/0x110 [<0000000015365e0f>] amduncoreinit+0x260/0x321 [<00000000089152d2>] dooneinitcall+0x3f/0x1f0 [<000000002d0bd18d>] kernelinitfreeable+0x1ca/0x212 [<0000000030be8dde>] kernelinit+0x11/0x120 [<0000000059709e59>] retfromfork+0x22/0x30 [...]

Fix the problem by freeing the events array before freeing the uncore context.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
39621c5808f5dda75d03dc4b2d4d2b13a5a1c34b
Fixed
f75be9885d49e3717de962345c4572ddab52b178
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
39621c5808f5dda75d03dc4b2d4d2b13a5a1c34b
Fixed
bdfe34597139cfcecd47a2eb97fea44d77157491

Affected versions

v5.*

v5.19
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8

v6.*

v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.0.1
v6.0.2
v6.0.3
v6.0.4
v6.0.5
v6.0.6
v6.0.7
v6.0.8
v6.0.9
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4

Database specific 

{
    "vanir_signatures": [
        {
            "target": {
                "function": "uncore_clean_online",
                "file": "arch/x86/events/amd/uncore.c"
            },
            "id": "CVE-2022-49784-12bd8daf",
            "digest": {
                "length": 185.0,
                "function_hash": "138331147804805638851038710843549549633"
            },
            "deprecated": false,
            "signature_type": "Function",
            "signature_version": "v1",
            "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@bdfe34597139cfcecd47a2eb97fea44d77157491"
        },
        {
            "target": {
                "function": "uncore_clean_online",
                "file": "arch/x86/events/amd/uncore.c"
            },
            "id": "CVE-2022-49784-2dc20bfd",
            "digest": {
                "length": 185.0,
                "function_hash": "138331147804805638851038710843549549633"
            },
            "deprecated": false,
            "signature_type": "Function",
            "signature_version": "v1",
            "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f75be9885d49e3717de962345c4572ddab52b178"
        },
        {
            "target": {
                "file": "arch/x86/events/amd/uncore.c"
            },
            "id": "CVE-2022-49784-55b15090",
            "digest": {
                "threshold": 0.9,
                "line_hashes": [
                    "181180899582266149785191880045677211287",
                    "276101935781763025137018848947803783055",
                    "182797600511125342051260085263803581824",
                    "172648177076713874682864192783968217584"
                ]
            },
            "deprecated": false,
            "signature_type": "Line",
            "signature_version": "v1",
            "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f75be9885d49e3717de962345c4572ddab52b178"
        },
        {
            "target": {
                "file": "arch/x86/events/amd/uncore.c"
            },
            "id": "CVE-2022-49784-8dad3a90",
            "digest": {
                "threshold": 0.9,
                "line_hashes": [
                    "181180899582266149785191880045677211287",
                    "276101935781763025137018848947803783055",
                    "182797600511125342051260085263803581824",
                    "172648177076713874682864192783968217584"
                ]
            },
            "deprecated": false,
            "signature_type": "Line",
            "signature_version": "v1",
            "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@bdfe34597139cfcecd47a2eb97fea44d77157491"
        }
    ]
}

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.0.0
Fixed
6.0.10