CVE-2022-49127

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without that rare debug config the tracker ops are compiled out as stubs.\nPR:L - An unprivileged user can obtain CAP_NET_ADMIN via user namespaces (unshare -Urn), create/destroy netdevs and network namespaces, and drive dismantle paths that exercise the tracker.\nUI:N - The attacker can create and tear down their own network devices/namespaces and trigger late hold/put paths without any victim action.\nS:U - Impact stays within the local kernel\u2019s networking reference-tracking state; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Use-after-free of heap-allocated struct ref_tracker objects after dir_exit frees them can be leveraged for arbitrary kernel memory disclosure via heap reuse.\nI:H - The same UAF enables heap spraying and corruption of reused tracker/list metadata, which can yield arbitrary write or control-flow hijacking primitives.\nA:H - UAF of freed trackers and the WARN_ON_ONCE path can oops/panic the kernel (including under panic_on_warn), causing a full availability loss."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/ref_tracker.h", "lib/ref_tracker.c"], "versions": [{"version": "4e66934eaadc83b27ada8d42b60894018f3bfabf", "lessThan": "3743c9de303fa36c2e2ca2522ab280c52bcafbd2", "status": "affected", "versionType": "git"}, {"version": "4e66934eaadc83b27ada8d42b60894018f3bfabf", "lessThan": "e3ececfe668facd87d920b608349a32607060e66", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/ref_tracker.h", "lib/ref_tracker.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.17.3", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "5.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "5.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3743c9de303fa36c2e2ca2522ab280c52bcafbd2"}, {"url": "https://git.kernel.org/stable/c/e3ececfe668facd87d920b608349a32607060e66"}], "title": "ref_tracker: implement use-after-free detection", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2022-49127", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-02-27T18:17:18.309932Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:34.926Z"}}]}}

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{"bugzilla": {"description": "kernel: ref_tracker: implement use-after-free detection", "id": "2347703", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347703"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nref_tracker: implement use-after-free detection\nWhenever ref_tracker_dir_init() is called, mark the struct ref_tracker_dir\nas dead.\nTest the dead status from ref_tracker_alloc() and ref_tracker_free()\nThis should detect buggy dev_put()/dev_hold() happening too late\nin netdevice dismantle process.", "A vulnerability was found in the Linux kernel's ref_tracker subsystem, which can lead to a use-after-free condition due to improper handling of reference tracking during network device teardown. Specifically, when ref_tracker_dir_init() is invoked, it marks the associated ref_tracker_dir structure as dead. However, if functions such as dev_put() or dev_hold() are called after this point, particularly during the dismantling of network devices, they may operate on already freed memory, which can lead to memory corruption and system instability."], "name": "CVE-2022-49127", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49127\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49127\nhttps://lore.kernel.org/linux-cve-announce/2025022605-CVE-2022-49127-15e6@gregkh/T"], "statement": "While the NVD has assigned this vulnerability a High severity rating with a CVSS score of 7.8, this assessment represents a theoretical worst-case scenario. It presumes potential chaining of exploitation that could impact confidentiality or integrity. However, in the absence of a confirmed proof-of-concept, evidence of attacker control, or any demonstrated real-world exploitation, this rating likely overstates the immediate and practical risk to our environment.", "threat_severity": "Low"}

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