{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43197", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.992Z", "datePublished": "2026-05-06T11:28:04.829Z", "dateUpdated": "2026-08-09T18:34:53.937Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-09T18:34:53.937Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetconsole: avoid OOB reads, msg is not nul-terminated\n\nmsg passed to netconsole from the console subsystem is not guaranteed\nto be nul-terminated. Before recent\ncommit 7eab73b18630 (\"netconsole: convert to NBCON console infrastructure\")\nthe message would be placed in printk_shared_pbufs, a static global\nbuffer, so KASAN had harder time catching OOB accesses. Now we see:\n\n printk: console [netcon_ext0] enabled\n BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240\n Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594\n\n CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9\n Call Trace:\n kasan_report+0xe4/0x120\n string+0x1f7/0x240\n vsnprintf+0x655/0xba0\n scnprintf+0xba/0x120\n netconsole_write+0x3fe/0xa10\n nbcon_emit_next_record+0x46e/0x860\n nbcon_kthread_func+0x623/0x750\n\n Allocated by task 1:\n nbcon_alloc+0x1ea/0x450\n register_console+0x26b/0xe10\n init_netconsole+0xbb0/0xda0\n\n The buggy address belongs to the object at ffff88813b6d4000\n which belongs to the cache kmalloc-4k of size 4096\n The buggy address is located 0 bytes to the right of\n allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - In a reasonable high-impact deployment, an internet-facing firewall/router can have netfilter LOG/nft log rules and extended netconsole with release prepend enabled, so unauthenticated remote packets can create printk records that flow into the vulnerable netconsole path. Netconsole itself sends UDP output rather than receiving commands, but the vulnerable code is reachable through network-triggered kernel logging.\nAC:L - Once the affected netconsole mode is configured and a log record is generated, the `%s` overread is deterministic and requires no race or attacker-uncontrolled timing. The non-fragmented path is easy to hit with ordinary short log messages.\nPR:N - For the network logging scenario, the attacker only sends packets that match an already configured logging rule and needs no account or privileges on the vulnerable host. Netconsole/configfs setup is an environmental prerequisite, not a per-attack privilege requirement.\nUI:N - No victim user action is required after the affected logging configuration is present. The attacker can trigger log generation directly.\nS:U - The vulnerability is in the kernel’s own console/logging path and impacts kernel memory on the same host security authority. It does not cross a VM, IOMMU, or similar separate security boundary.\nC:H - The bug is an out-of-bounds read caused by treating a length-delimited printk buffer as NUL-terminated, allowing reads past the valid message into adjacent printk/slab memory. The leaked bytes can be transmitted in netconsole UDP output and repeated, so confidentiality impact is high.\nI:N - The vulnerable operation is a read-only string scan/copy into the netconsole transmit buffer. I found no out-of-bounds write, object corruption, or control-flow modification primitive.\nA:H - The fix commit shows a KASAN slab-out-of-bounds BUG in this path, and the unbounded `%s` scan can read past the allocation until a NUL byte or fault. Repeated attacker-triggered log messages can therefore reasonably cause kernel oops/panic or severe logging-path disruption." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/netconsole.c" ], "versions": [ { "version": "c62c0a17f9b7398022f9eebe547878033264f81f", "lessThan": "8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9", "status": "affected", "versionType": "git" }, { "version": "c62c0a17f9b7398022f9eebe547878033264f81f", "lessThan": "3126a2f98beaec5a554a1fb31c46db1e8542665e", "status": "affected", "versionType": "git" }, { "version": "c62c0a17f9b7398022f9eebe547878033264f81f", "lessThan": "74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58", "status": "affected", "versionType": "git" }, { "version": "c62c0a17f9b7398022f9eebe547878033264f81f", "lessThan": "82aec772fca2223bc5774bd9af486fd95766e578", "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/net/netconsole.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.6", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9" }, { "url": "https://git.kernel.org/stable/c/3126a2f98beaec5a554a1fb31c46db1e8542665e" }, { "url": "https://git.kernel.org/stable/c/74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58" }, { "url": "https://git.kernel.org/stable/c/82aec772fca2223bc5774bd9af486fd95766e578" } ], "title": "netconsole: avoid OOB reads, msg is not nul-terminated", "x_generator": { "engine": "bippy-1.2.0" } } } }