{"id":"CVE-2025-39998","state":"PUBLISHED","title":"scsi: target: target_core_configfs: Add length check to avoid buffer overflow","description":"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.","publishedAt":"2025-10-15T07:58:22.354Z","updatedAt":"2026-10-15T22:02:35.977Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"e6eeee5dc0d9221ff96d1b229b1d0222c8871b84","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"764a91e2fc9639e07aac93bc70e387e6b1e33084","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"ddc79fba132b807ff775467acceaf48b456e008b","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"f03aa5e39da7d045615b3951d2a6ca1d7132f881","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"53c6351597e6a17ec6619f6f060d54128cb9a187","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"4b292286949588bd2818e66ff102db278de8dd26","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"a150275831b765b0f1de8b8ff52ec5c6933ac15d","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"27e06650a5eafe832a90fd2604f0c5e920857fae","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/target/target_core_configfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.4.301","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.246","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.195","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.156","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.110","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.51","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.11","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17.1","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/target/target_core_configfs.c"]}],"references":["https://git.kernel.org/stable/c/e6eeee5dc0d9221ff96d1b229b1d0222c8871b84","https://git.kernel.org/stable/c/764a91e2fc9639e07aac93bc70e387e6b1e33084","https://git.kernel.org/stable/c/ddc79fba132b807ff775467acceaf48b456e008b","https://git.kernel.org/stable/c/e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4","https://git.kernel.org/stable/c/f03aa5e39da7d045615b3951d2a6ca1d7132f881","https://git.kernel.org/stable/c/53c6351597e6a17ec6619f6f060d54128cb9a187","https://git.kernel.org/stable/c/4b292286949588bd2818e66ff102db278de8dd26","https://git.kernel.org/stable/c/a150275831b765b0f1de8b8ff52ec5c6933ac15d","https://git.kernel.org/stable/c/27e06650a5eafe832a90fd2604f0c5e920857fae"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/39xxx/CVE-2025-39998.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39998","state":"PUBLISHED","datePublished":"2025-10-15T07:58:22.354Z","dateUpdated":"2026-10-15T22:02:35.977Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.151Z"},"containers":{"cna":{"title":"scsi: target: target_core_configfs: Add length check to avoid buffer overflow","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"e6eeee5dc0d9221ff96d1b229b1d0222c8871b84","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"764a91e2fc9639e07aac93bc70e387e6b1e33084","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"ddc79fba132b807ff775467acceaf48b456e008b","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"f03aa5e39da7d045615b3951d2a6ca1d7132f881","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"53c6351597e6a17ec6619f6f060d54128cb9a187","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"4b292286949588bd2818e66ff102db278de8dd26","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"a150275831b765b0f1de8b8ff52ec5c6933ac15d","versionType":"git"},{"version":"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5","status":"affected","lessThan":"27e06650a5eafe832a90fd2604f0c5e920857fae","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/target/target_core_configfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.4.301","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.246","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.195","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.156","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.110","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.51","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.11","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17.1","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/target/target_core_configfs.c"]}],"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"}],"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/<gp>/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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:07:00.453Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2025-39998","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-15T21:56:02.868317Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T22:02:35.977Z"}}]}}}