{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39998", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.151Z", "datePublished": "2025-10-15T07:58:22.354Z", "dateUpdated": "2026-08-05T12:07:00.453Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:07:00.453Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: target_core_configfs: Add length check to avoid buffer overflow\n\nA buffer overflow arises from the usage of snprintf to write into the\nbuffer \"buf\" in target_lu_gp_members_show function located in\n/drivers/target/target_core_configfs.c. This buffer is allocated with\nsize LU_GROUP_NAME_BUF (256 bytes).\n\nsnprintf(...) formats multiple strings into buf with the HBA name\n(hba->hba_group.cg_item), a slash character, a devicename (dev->\ndev_group.cg_item) and a newline character, the total formatted string\nlength may exceed the buffer size of 256 bytes.\n\nSince snprintf() returns the total number of bytes that would have been\nwritten (the length of %s/%sn ), this value may exceed the buffer length\n(256 bytes) passed to memcpy(), this will ultimately cause function\nmemcpy reporting a buffer overflow error.\n\nAn additional check of the return value of snprintf() can avoid this\nbuffer overflow." } ], "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 read(2) on a configfs attribute file at /sys/kernel/config/target/core/alua/lu_gps//members, which requires local access to the system. There is no network-facing path into target_lu_gp_members_show().\nAC:L - The over-read is fully deterministic — once an HBA+device name pair exceeding 255 combined characters exists, every read of the members file executes memcpy() with a length larger than the 256-byte stack source, with no race or memory-layout dependency.\nPR:L - The members attribute is CONFIGFS_ATTR_RO (mode 0444) under 0755 configfs directories, so any unprivileged local account — or a container with /sys bind-mounted read-only — can perform the triggering read; only the pre-existing long backstore name is admin-created state, not a privilege the attacker must hold.\nUI:N - Exploitation is a single read() by the attacker with no victim action required. No administrator or other user must be induced to do anything at exploit time.\nS:U - The out-of-bounds read and the resulting disclosure/panic are confined to the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~65 bytes of kernel stack memory adjacent to buf[256] are copied into the configfs page and returned to userspace, plausibly leaking the stack canary, saved registers, and kernel/list pointers that defeat KASLR and stack protector. This is well beyond a \"few bytes\" bounded read.\nI:N - The (cur_len + len) > PAGE_SIZE check correctly bounds the memcpy destination inside the get_zeroed_page() buffer, so no kernel memory is written out of bounds and no write or control-flow primitive is produced.\nA:H - With CONFIG_FORTIFY_SOURCE (default in distro kernels) the runtime source-size check in fortify_memcpy_chk() fires and calls fortify_panic(), producing a kernel BUG/panic; KASAN builds BUG as well, and the attacker can trigger this at will by re-reading the file." } ] } ], "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": "e6eeee5dc0d9221ff96d1b229b1d0222c8871b84", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "764a91e2fc9639e07aac93bc70e387e6b1e33084", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "ddc79fba132b807ff775467acceaf48b456e008b", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "f03aa5e39da7d045615b3951d2a6ca1d7132f881", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "53c6351597e6a17ec6619f6f060d54128cb9a187", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "4b292286949588bd2818e66ff102db278de8dd26", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "a150275831b765b0f1de8b8ff52ec5c6933ac15d", "status": "affected", "versionType": "git" }, { "version": "c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5", "lessThan": "27e06650a5eafe832a90fd2604f0c5e920857fae", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/target_core_configfs.c" ], "versions": [ { "version": "2.6.38", "status": "affected" }, { "version": "0", "lessThan": "2.6.38", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.301", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.246", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.195", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.156", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.110", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.51", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.11", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.1", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "2.6.38", "versionEndExcluding": "5.4.301" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.10.246" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.15.195" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.1.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.6.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.12.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.16.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.17.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e6eeee5dc0d9221ff96d1b229b1d0222c8871b84" }, { "url": "https://git.kernel.org/stable/c/764a91e2fc9639e07aac93bc70e387e6b1e33084" }, { "url": "https://git.kernel.org/stable/c/ddc79fba132b807ff775467acceaf48b456e008b" }, { "url": "https://git.kernel.org/stable/c/e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4" }, { "url": "https://git.kernel.org/stable/c/f03aa5e39da7d045615b3951d2a6ca1d7132f881" }, { "url": "https://git.kernel.org/stable/c/53c6351597e6a17ec6619f6f060d54128cb9a187" }, { "url": "https://git.kernel.org/stable/c/4b292286949588bd2818e66ff102db278de8dd26" }, { "url": "https://git.kernel.org/stable/c/a150275831b765b0f1de8b8ff52ec5c6933ac15d" }, { "url": "https://git.kernel.org/stable/c/27e06650a5eafe832a90fd2604f0c5e920857fae" } ], "title": "scsi: target: target_core_configfs: Add length check to avoid buffer overflow", "x_generator": { "engine": "bippy-1.2.0" } } } }