{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-52937", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.370Z", "datePublished": "2026-06-24T07:14:27.305Z", "dateUpdated": "2026-06-24T07:14:27.305Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T07:14:27.305Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR\n\nIn the SIOCGIFHWADDR path, tap_ioctl() copies 16 bytes of an\nuninitialised on-stack struct sockaddr_storage to userspace via\nifr_hwaddr, but netif_get_mac_address() only writes sa_family and\ndev->addr_len (6 for Ethernet) bytes, leaving sa_data[6..13] uninitialised.\n\nThose 8 trailing bytes leak kernel stack contents; SIOCGIFHWADDR on a\nmacvtap chardev returns kernel .text and direct-map pointers, defeating\nKASLR.\n\nInitialise ss at declaration."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/tap.c"], "versions": [{"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0", "lessThan": "719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb", "status": "affected", "versionType": "git"}, {"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0", "lessThan": "05305e832be7b9d65b2b72caacf7d850b3942b2a", "status": "affected", "versionType": "git"}, {"version": "3b23a32a63219f51a5298bc55a65ecee866e79d0", "lessThan": "bddc09212c24934643bd44fc794748d2bbb3b6cd", "status": "affected", "versionType": "git"}, {"version": "176188cff67ec1aa55103647b61d02315cc38e98", "status": "affected", "versionType": "git"}, {"version": "1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4", "status": "affected", "versionType": "git"}, {"version": "4d0ae760c02c98fc78b78d3a0509896bc648ad1c", "status": "affected", "versionType": "git"}, {"version": "5.4.103", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.10.21", "lessThan": "5.11", "status": "affected", "versionType": "semver"}, {"version": "5.11.4", "lessThan": "5.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/tap.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.12", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb"}, {"url": "https://git.kernel.org/stable/c/05305e832be7b9d65b2b72caacf7d850b3942b2a"}, {"url": "https://git.kernel.org/stable/c/bddc09212c24934643bd44fc794748d2bbb3b6cd"}], "title": "tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR", "id": "2492102", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492102"}, "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"}, "cwe": "CWE-909", "details": ["A flaw was found in the Linux kernel's tap driver. This vulnerability allows an attacker to potentially disclose sensitive kernel stack memory contents to userspace. The flaw occurs in the `tap_ioctl()` function when handling the `SIOCGIFHWADDR` command, where uninitialized portions of a stack-allocated structure are copied to userspace. This information leak could be used to bypass Kernel Address Space Layout Randomization (KASLR), making it easier for attackers to exploit other vulnerabilities."], "name": "CVE-2026-52937", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52937\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52937\nhttps://lore.kernel.org/linux-cve-announce/2026062434-CVE-2026-52937-62eb@gregkh/T"], "threat_severity": "Moderate"}