{"id":"CVE-2026-72033","state":"PUBLISHED","title":"orangefs: keep the readdir entry size 64-bit in fill_from_part()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: keep the readdir entry size 64-bit in fill_from_part()\n\nfill_from_part() computes the size of a directory entry in size_t but\nstores it in a __u32. An entry length near U32_MAX wraps it to a small\nvalue, bypasses the bounds check, and is then used to index the entry,\nreading far past the directory part -- an out-of-bounds read that oopses\nthe kernel.\n\nCompute the size as a u64 so it cannot truncate; the bounds check then\nrejects the entry. The trailer is supplied by the userspace client.","publishedAt":"2026-08-15T05:51:55.102Z","updatedAt":"2026-08-17T05:39:36.089Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/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":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"1679780f482feeb82acb5995587d4fb1d1fe82fd","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"a72bbb43689591c9d36e3bb45c2d4e688cf92682","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"36723b28e3293047f087f4501f1ef4ead418dd84","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"82fc886e244c76fadf05ef1958aaf8815478ccde","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/orangefs/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","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/orangefs/dir.c"]}],"references":["https://git.kernel.org/stable/c/1679780f482feeb82acb5995587d4fb1d1fe82fd","https://git.kernel.org/stable/c/a72bbb43689591c9d36e3bb45c2d4e688cf92682","https://git.kernel.org/stable/c/36723b28e3293047f087f4501f1ef4ead418dd84","https://git.kernel.org/stable/c/07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9","https://git.kernel.org/stable/c/fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1","https://git.kernel.org/stable/c/82fc886e244c76fadf05ef1958aaf8815478ccde","https://git.kernel.org/stable/c/e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729","https://git.kernel.org/stable/c/18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72033.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72033","state":"PUBLISHED","datePublished":"2026-08-15T05:51:55.102Z","dateUpdated":"2026-08-17T05:39:36.089Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.901Z"},"containers":{"cna":{"title":"orangefs: keep the readdir entry size 64-bit in fill_from_part()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: keep the readdir entry size 64-bit in fill_from_part()\n\nfill_from_part() computes the size of a directory entry in size_t but\nstores it in a __u32. An entry length near U32_MAX wraps it to a small\nvalue, bypasses the bounds check, and is then used to index the entry,\nreading far past the directory part -- an out-of-bounds read that oopses\nthe kernel.\n\nCompute the size as a u64 so it cannot truncate; the bounds check then\nrejects the entry. The trailer is supplied by the userspace client."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"1679780f482feeb82acb5995587d4fb1d1fe82fd","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"a72bbb43689591c9d36e3bb45c2d4e688cf92682","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"36723b28e3293047f087f4501f1ef4ead418dd84","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"82fc886e244c76fadf05ef1958aaf8815478ccde","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729","versionType":"git"},{"version":"480e3e532e31666a18520a7964bb4095d7a16b9a","status":"affected","lessThan":"18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/orangefs/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","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/orangefs/dir.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1679780f482feeb82acb5995587d4fb1d1fe82fd"},{"url":"https://git.kernel.org/stable/c/a72bbb43689591c9d36e3bb45c2d4e688cf92682"},{"url":"https://git.kernel.org/stable/c/36723b28e3293047f087f4501f1ef4ead418dd84"},{"url":"https://git.kernel.org/stable/c/07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9"},{"url":"https://git.kernel.org/stable/c/fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1"},{"url":"https://git.kernel.org/stable/c/82fc886e244c76fadf05ef1958aaf8815478ccde"},{"url":"https://git.kernel.org/stable/c/e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729"},{"url":"https://git.kernel.org/stable/c/18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - fill_from_part() parses readdir trailer bytes relayed by pvfs2-client-core from an OrangeFS/PVFS server over the cluster network; a malicious or compromised server can supply crafted directory-entry lengths that reach the kernel during getdents on HPC client nodes without local shell access.\nAC:L - An entry length near U32_MAX makes padlen truncate to a small __u32, reliably bypassing the bounds check and forcing the subsequent s[*len] probe; the attacker fully controls the trailer fields and no race, heap layout, or timing condition beyond readdir is required.\nPR:N - A remote malicious OrangeFS/PVFS metadata server needs no account, capabilities, or namespaces on victim HPC compute nodes; once clients mount the filesystem, any process with directory read access can trigger parsing of attacker-supplied trailer bytes.\nUI:N - No victim interaction is required beyond normal automated directory scans (cron, parallel job launchers, monitoring); the attacker does not need a user to mount the filesystem or click anything—only pre-existing cluster mounts to the compromised server.\nS:U - The out-of-bounds read and resulting kernel oops occur entirely within the victim client's kernel address space during VFS readdir processing; there is no inherent crossing of VM, container, IOMMU, or sandbox security boundaries.\nC:H - The integer truncation lets the kernel index gigabytes past the vzalloc readdir part buffer via s[*len], an unbounded out-of-bounds read over adjacent kernel memory before the fault; per CNA guidance OOB reads of this class are rated High.\nI:H - The bounds bypass is a memory-corruption class flaw that can reach beyond the allocated directory part into adjacent kernel heap; even though the immediate access is a read, CNA guidance rates such unchecked OOB probes as High integrity impact due to exploit chaining potential.\nA:H - The maintainer confirmed the out-of-bounds read oopses the kernel; the inflated index can touch unmapped pages far outside the PART_SIZE-limited trailer buffer, causing a kernel fault, panic, or node crash on HPC clients during routine readdir."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:39:36.089Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}