{"id":"CVE-2026-80598","state":"PUBLISHED","title":"ntfs3: fix out-of-bounds read in decompress_lznt","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in decompress_lznt\n\ndecompress_lznt() does not validate array index bounds before accessing\nthe decompression table. A corrupted NTFS3 image with invalid compressed\ndata can trigger an out-of-bounds read.\n\nAdd index bounds checking to prevent the OOB access.","publishedAt":"2026-08-28T06:48:24.097Z","updatedAt":"2026-10-16T19:26:29.603Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"1113fa5b01a47a1a4cdbb9c695197ca6215f02a8","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"61415ffa365d2eca6986914afd0d1412444aa1dd","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"bd77afca2ae9b6d44d37902e3ad672ebb028b070","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"c694f8ea2611e7413b3f04ee47e04a9b7b45817b","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"ff05a98150ebb2b03919a9c05c576681e86abbb7","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"a93980141253c932aa6ae5d4422d90e0162dc774","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"7160a57192fb16d7a6fa9b7f5c7ac341d2444a89","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/lznt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/lznt.c"]}],"references":["https://git.kernel.org/stable/c/1113fa5b01a47a1a4cdbb9c695197ca6215f02a8","https://git.kernel.org/stable/c/61415ffa365d2eca6986914afd0d1412444aa1dd","https://git.kernel.org/stable/c/bd77afca2ae9b6d44d37902e3ad672ebb028b070","https://git.kernel.org/stable/c/c694f8ea2611e7413b3f04ee47e04a9b7b45817b","https://git.kernel.org/stable/c/ff05a98150ebb2b03919a9c05c576681e86abbb7","https://git.kernel.org/stable/c/a93980141253c932aa6ae5d4422d90e0162dc774","https://git.kernel.org/stable/c/7160a57192fb16d7a6fa9b7f5c7ac341d2444a89"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80598.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80598","state":"PUBLISHED","datePublished":"2026-08-28T06:48:24.097Z","dateUpdated":"2026-10-16T19:26:29.603Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.771Z"},"containers":{"cna":{"title":"ntfs3: fix out-of-bounds read in decompress_lznt","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in decompress_lznt\n\ndecompress_lznt() does not validate array index bounds before accessing\nthe decompression table. A corrupted NTFS3 image with invalid compressed\ndata can trigger an out-of-bounds read.\n\nAdd index bounds checking to prevent the OOB access."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"1113fa5b01a47a1a4cdbb9c695197ca6215f02a8","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"61415ffa365d2eca6986914afd0d1412444aa1dd","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"bd77afca2ae9b6d44d37902e3ad672ebb028b070","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"c694f8ea2611e7413b3f04ee47e04a9b7b45817b","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"ff05a98150ebb2b03919a9c05c576681e86abbb7","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"a93980141253c932aa6ae5d4422d90e0162dc774","versionType":"git"},{"version":"522e010b58379fbe19b38fdef5016bca0c3cf405","status":"affected","lessThan":"7160a57192fb16d7a6fa9b7f5c7ac341d2444a89","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/lznt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/lznt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1113fa5b01a47a1a4cdbb9c695197ca6215f02a8"},{"url":"https://git.kernel.org/stable/c/61415ffa365d2eca6986914afd0d1412444aa1dd"},{"url":"https://git.kernel.org/stable/c/bd77afca2ae9b6d44d37902e3ad672ebb028b070"},{"url":"https://git.kernel.org/stable/c/c694f8ea2611e7413b3f04ee47e04a9b7b45817b"},{"url":"https://git.kernel.org/stable/c/ff05a98150ebb2b03919a9c05c576681e86abbb7"},{"url":"https://git.kernel.org/stable/c/a93980141253c932aa6ae5d4422d90e0162dc774"},{"url":"https://git.kernel.org/stable/c/7160a57192fb16d7a6fa9b7f5c7ac341d2444a89"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - decompress_lznt() is reached only when the kernel reads LZNT-compressed NTFS file data through local VFS paths (read/mmap/write on compressed files) after an ntfs3 mount; it is not invoked from network protocol parsers such as nfsd, ksmbd, or the TCP/IP stack.\nAC:L - Attacker fully controls the on-disk LZNT compressed stream in a crafted file/image and can reliably drive the index past s_max_off[] bounds to trigger the out-of-bounds read; syzbot/syzkaller reproduced this without races or attacker-uncontrollable memory layout.\nPR:L - Triggering decompression requires only read access to a compressed file via open/read/mmap, or mounting a malicious NTFS image which needs CAP_SYS_ADMIN obtainable by unprivileged users inside user+mount namespaces on typical Linux systems.\nUI:N - No separate victim action is required when the attacker has local access: they can mount a crafted NTFS image in a user namespace and read the malicious compressed file themselves to reach decompress_lznt() without anyone else interacting with the system.\nS:U - The flaw corrupts or discloses kernel memory during NTFS LZNT decompression within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries and is not a sandbox or hypervisor escape.\nC:H - The bug performs out-of-bounds reads of kernel memory past the nine-element s_max_off[] table in .rodata, and attacker-controlled index values feed parse_pair() and decompression output, enabling disclosure of sensitive kernel data into page-cache buffers returned to userspace.\nI:H - Unbounded index growth from malformed LZNT input passes attacker-influenced shift widths into parse_pair(), producing malformed backreference offset/length pairs that drive the LZ copy loop and can corrupt kernel page-cache memory in ways chainable toward arbitrary write primitives.\nA:H - Out-of-bounds access to s_max_off[] is a kernel memory safety violation that KASAN/KFENCE report and can oops or panic the kernel; repeated reads of a malicious compressed file can reliably deny service to the reading process or the entire system."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-30T07:08:34.000Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80598","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:18:18.558534Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:29.603Z"}}]}}}