CVE-2026-46149

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The check at the memcpy() site only\nguards the destination page write, not the source read, so memcpy() will\nread past the stack buffer and copy adjacent stack contents to the sysfs\nreader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic()\nwill be triggered.\n\nCommit 27e06650a5ea (\"scsi: target: target_core_configfs: Add length\ncheck to avoid buffer overflow\") added the same bound to the\ntarget_lu_gp_members_show() but the tg_pt_gp variant was missed so\nresolve that here."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is triggered by reading a configfs/sysfs attribute file (target/.../alua/tg_pt_gps/<grp>/members); there is no network-reachable path and the formatted IQN comes from local admin config, so it requires local system access.\nAC:L - Given a target configured with a sufficiently long iSCSI IQN (the vulnerable configuration), simply reading the file deterministically triggers the out-of-bounds read/fortify_panic with no race or memory-layout dependency.\nPR:L - The members attribute is CONFIGFS_ATTR_RO (mode 0444, world-readable) with no capability check in the show path, so any unprivileged local user who can read the globally-mounted configfs file triggers it.\nUI:N - Exploitation is a single read() of the file with no victim/user interaction required.\nS:U - The impact (stack info leak / panic) stays within the kernel's own security authority with no crossing of a trust boundary such as a VM or IOMMU.\nC:H - The memcpy reads past the 256-byte stack buffer and copies adjacent kernel stack contents (potential pointers/canary) into the userspace-readable sysfs page, an out-of-bounds read disclosing kernel memory.\nI:N - The destination page write is bounded by the PAGE_SIZE check, so no kernel memory is modified; the bug is a read-only overflow providing no write primitive.\nA:H - With CONFIG_FORTIFY_SOURCE enabled, the over-read memcpy triggers fortify_panic(), causing a kernel panic (denial of service)."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_configfs.c"], "versions": [{"version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "d3cc9d490c207d57a289054397349f6f8c90354e", "status": "affected", "versionType": "git"}, {"version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "db0a4759d62cad4ff891e2d81ae4be73bb57f4a4", "status": "affected", "versionType": "git"}, {"version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "12f2201a56957ba020392223a7393a5eba080c1b", "status": "affected", "versionType": "git"}, {"version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "1f678d13e939f91840cb1ebe9b88544923539d3c", "status": "affected", 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there is no network-reachable path and the formatted IQN comes from local admin config, so it requires local system access.\nAC:L - Given a target configured with a sufficiently long iSCSI IQN (the vulnerable configuration), simply reading the file deterministically triggers the out-of-bounds read/fortify_panic with no race or memory-layout dependency.\nPR:L - The members attribute is CONFIGFS_ATTR_RO (mode 0444, world-readable) with no capability check in the show path, so any unprivileged local user who can read the globally-mounted configfs file triggers it.\nUI:N - Exploitation is a single read() of the file with no victim/user interaction required.\nS:U - The impact (stack info leak / panic) stays within the kernel's own security authority with no crossing of a trust boundary such as a VM or IOMMU.\nC:H - The memcpy reads past the 256-byte stack buffer and copies adjacent kernel stack contents (potential pointers/canary) into the userspace-readable sysfs page, an out-of-bounds read disclosing kernel memory.\nI:N - The destination page write is bounded by the PAGE_SIZE check, so no kernel memory is modified; the bug is a read-only overflow providing no write primitive.\nA:H - With CONFIG_FORTIFY_SOURCE enabled, the over-read memcpy triggers fortify_panic(), causing a kernel panic (denial of service)."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "d3cc9d490c207d57a289054397349f6f8c90354e", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "db0a4759d62cad4ff891e2d81ae4be73bb57f4a4", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "12f2201a56957ba020392223a7393a5eba080c1b", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "1f678d13e939f91840cb1ebe9b88544923539d3c", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "00d91bfdce5033f5d9b4915638ae9b0553848b5d", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "e501154f9d82c95d2719bcbbaf679d8fd3226ef7", "versionType": "git"}, {"status": "affected", "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "772a896a56e0e3ef9424a025cec9176f9d8f4552", "versionType": "git"}], "programFiles": ["drivers/target/target_core_configfs.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.38"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.38", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.88", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.30", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.7", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/target/target_core_configfs.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/d3cc9d490c207d57a289054397349f6f8c90354e"}, {"url": "https://git.kernel.org/stable/c/db0a4759d62cad4ff891e2d81ae4be73bb57f4a4"}, {"url": "https://git.kernel.org/stable/c/12f2201a56957ba020392223a7393a5eba080c1b"}, {"url": "https://git.kernel.org/stable/c/1f678d13e939f91840cb1ebe9b88544923539d3c"}, {"url": "https://git.kernel.org/stable/c/72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e"}, {"url": "https://git.kernel.org/stable/c/00d91bfdce5033f5d9b4915638ae9b0553848b5d"}, {"url": "https://git.kernel.org/stable/c/e501154f9d82c95d2719bcbbaf679d8fd3226ef7"}, {"url": "https://git.kernel.org/stable/c/772a896a56e0e3ef9424a025cec9176f9d8f4552"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()\n\ntarget_tg_pt_gp_members_show() formats LUN paths with snprintf() into a\n256-byte stack buffer, then will memcpy() cur_len bytes from that\nbuffer. snprintf() returns the length the output would have had, which\ncan exceed the buffer size when the fabric WWN is long because iSCSI IQN\nnames can be up to 223 bytes. 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The check at the memcpy() site only\nguards the destination page write, not the source read, so memcpy() will\nread past the stack buffer and copy adjacent stack contents to the sysfs\nreader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic()\nwill be triggered.\n\nCommit 27e06650a5ea (\"scsi: target: target_core_configfs: Add length\ncheck to avoid buffer overflow\") added the same bound to the\ntarget_lu_gp_members_show() but the tg_pt_gp variant was missed so\nresolve that here."}], "id": "CVE-2026-46149", "lastModified": "2026-10-19T20:18:35.093", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46149", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:20:25.998388Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:30.513", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/00d91bfdce5033f5d9b4915638ae9b0553848b5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/12f2201a56957ba020392223a7393a5eba080c1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f678d13e939f91840cb1ebe9b88544923539d3c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/772a896a56e0e3ef9424a025cec9176f9d8f4552"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3cc9d490c207d57a289054397349f6f8c90354e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db0a4759d62cad4ff891e2d81ae4be73bb57f4a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e501154f9d82c95d2719bcbbaf679d8fd3226ef7"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-126"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()", "id": "2482566", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482566"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["A flaw was found in the Linux kernel's SCSI target subsystem. This vulnerability, a buffer overflow, occurs in the `tg_pt_gp_members_show()` function when processing long iSCSI IQN names. An attacker could potentially exploit this by providing a specially crafted input, leading to the disclosure of sensitive information from the kernel stack or a denial of service (DoS) if `CONFIG_FORTIFY_SOURCE` is enabled."], "name": "CVE-2026-46149", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46149\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46149\nhttps://lore.kernel.org/linux-cve-announce/2026052822-CVE-2026-46149-ad2e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5,1f678d13e939f91840cb1ebe9b88544923539d3c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5,72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5,00d91bfdce5033f5d9b4915638ae9b0553848b5d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5,e501154f9d82c95d2719bcbbaf679d8fd3226ef7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5,772a896a56e0e3ef9424a025cec9176f9d8f4552)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.38"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.38)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-28T11:45:16.112355+00:00", "updated": "2026-10-23T01:30:13.893647+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}