CVE-2026-93813

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93813", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.790Z", "datePublished": "2026-09-24T16:02:49.907Z", "dateUpdated": "2026-10-03T10:57:45.809Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:57:45.809Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tree-checker: validate INODE_REF's namelen\n\n[BUG]\nA crafted btrfs image can trigger the following crash:\n\n BUG: unable to handle page fault for address: ffffd1dc42884000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n CPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full) 46af0a92938a63be7132e0dfd71e62327c51d5c2\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n RIP: 0010:memcpy+0xc/0x10\n Call Trace:\n <TASK>\n read_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n btrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n reconnect_path+0x165/0x390\n exportfs_decode_fh_raw+0x337/0x400\n ? drop_caches_sysctl_handler+0xb0/0xb0\n </TASK>\n ---[ end trace 0000000000000000 ]---\n RIP: 0010:memcpy+0xc/0x10\n Kernel panic - not syncing: Fatal exception\n\n[CAUSE]\nTThe crafted image has the following corrupted INODE_REF item:\n\n item 9 key (258 INODE_REF 257) itemoff 11544 itemsize 4106\n \tindex 2 namelen 4096 name: d\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\n\nThe itemsize matches the namelen, but the namelen is 4096, way larger\nthan normal name length limit (BTRFS_NAME_LEN, 255).\n\nMeanwhile the memory of the @name is only 255 byte sized, this will cause\nout-of-boundary access, and cause the above crash.\n\n[FIX]\nAdd extra namelen verification for INODE_REF, just like what we have\ndone in ROOT_REF checks.\n\nNow the crafted image can be rejected gracefully:\n\n BTRFS critical (device dm-2): corrupt leaf: root=5 block=30572544 slot=14 ino=259, invalid inode ref name length, has 4096 expect [1, 255]\n BTRFS error (device dm-2): read time tree block corruption detected on logical 30572544 mirror 2\n\n[ Rebase, add a Link: tag, add an simple cause analyze ]"}], "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 - check_inode_ref() failed to cap INODE_REF name_len, so a crafted leaf with name_len 4096 is accepted. Those bytes come from the mounted image, not a protocol field. The overflow is open_by_handle_at() \u2192 do_handle_to_path() \u2192 exportfs_decode_fh_raw() \u2192 reconnect_path() \u2192 btrfs_get_name(); btrfs_fid has only objectid/gen, so an NFS handle does not carry the bad namelen.\nAC:L - The attacker writes an INODE_REF whose name_len exceeds BTRFS_NAME_LEN (255) but fits the item (PoC: 4096/4106), which the old check_inode_ref() allowed. Mounting that image and calling open_by_handle_at() on a directory filehandle for that inode makes reconnect_path() call btrfs_get_name() every time; no race or uninducible device failure is required.\nPR:L - btrfs_fs_type lacks FS_USERNS_MOUNT, so mount_capable() needs init-ns CAP_SYS_ADMIN, but a local user can mount the image via udisks2/polkit. The trigger is open_by_handle_at(): may_decode_fh() admits ns_capable(current_user_ns(), CAP_DAC_READ_SEARCH) with capable_wrt_mount() and O_DIRECTORY, so userns root on that mount is enough.\nUI:N - The attacker authors the INODE_REF, mounts the image (udisks/loop), and calls open_by_handle_at() so reconnect_path() runs btrfs_get_name() on that inode. That is their own action against data they already control; no second user must open a file or confirm a dialog.\nS:U - btrfs_get_name()'s overflow of exportfs_decode_fh_raw()'s nbuf corrupts the host kernel stack only. It does not cross a KVM/Xen guest-host, IOMMU/DMA, or other security-authority boundary.\nC:H - read_extent_buffer() in btrfs_get_name() memcpy's the attacker-chosen INODE_REF name (PoC namelen 4096) into exportfs_decode_fh_raw()'s nbuf[NAME_MAX+1] (256 bytes). That stack overflow overwrites saved frames and is kernel memory corruption usable for arbitrary disclosure.\nI:H - The same unbounded copy, plus name[name_len]='\\0' at offset 4096, is an attacker-controlled out-of-bounds write into kernel stack in exportfs_decode_fh_raw(). Chosen namelen/name bytes enable return-address overwrite and control-flow hijack, not a bounded metadata tweak.\nA:H - The reporter's PoC faults in memcpy() from read_extent_buffer() called by btrfs_get_name() (supervisor write to an unmapped address) and panics. Any name_len that runs nbuf off the mapped stack oopses the host."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-checker.c"], "versions": [{"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "60078a3e25c09d9d8fba828b0d81bb33e449a1b2", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "509d6a4d889e425f305461d8323a7b39ca6c121c", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "4cb41f07685f88ec724a375883bb0c731db8f6eb", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "eeddee090b834a7d4b6a8214d2e3739e64c7a338", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "8f75c19892263bc0555fba922aefe103e841e86d", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "3dc22abc21f5892406c09202fa2627196cc96967", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-checker.c"], "versions": [{"version": "2.6.37", "status": "affected"}, {"version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "2.6.37", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2"}, {"url": "https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c"}, {"url": "https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb"}, {"url": "https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338"}, {"url": "https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d"}, {"url": "https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967"}], "title": "btrfs: tree-checker: validate INODE_REF's namelen", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/tree-checker.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "60078a3e25c09d9d8fba828b0d81bb33e449a1b2", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "509d6a4d889e425f305461d8323a7b39ca6c121c", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "4cb41f07685f88ec724a375883bb0c731db8f6eb", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "eeddee090b834a7d4b6a8214d2e3739e64c7a338", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "8f75c19892263bc0555fba922aefe103e841e86d", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "3dc22abc21f5892406c09202fa2627196cc96967", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/tree-checker.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.37"}, {"lessThan": "2.6.37", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tree-checker: validate INODE_REF's namelen\n\n[BUG]\nA crafted btrfs image can trigger the following crash:\n\n BUG: unable to handle page fault for address: ffffd1dc42884000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n CPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full) 46af0a92938a63be7132e0dfd71e62327c51d5c2\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n RIP: 0010:memcpy+0xc/0x10\n Call Trace:\n <TASK>\n read_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n btrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n reconnect_path+0x165/0x390\n exportfs_decode_fh_raw+0x337/0x400\n ? drop_caches_sysctl_handler+0xb0/0xb0\n </TASK>\n ---[ end trace 0000000000000000 ]---\n RIP: 0010:memcpy+0xc/0x10\n Kernel panic - not syncing: Fatal exception\n\n[CAUSE]\nTThe crafted image has the following corrupted INODE_REF item:\n\n item 9 key (258 INODE_REF 257) itemoff 11544 itemsize 4106\n \tindex 2 namelen 4096 name: d\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\n\nThe itemsize matches the namelen, but the namelen is 4096, way larger\nthan normal name length limit (BTRFS_NAME_LEN, 255).\n\nMeanwhile the memory of the @name is only 255 byte sized, this will cause\nout-of-boundary access, and cause the above crash.\n\n[FIX]\nAdd extra namelen verification for INODE_REF, just like what we have\ndone in ROOT_REF checks.\n\nNow the crafted image can be rejected gracefully:\n\n BTRFS critical (device dm-2): corrupt leaf: root=5 block=30572544 slot=14 ino=259, invalid inode ref name length, has 4096 expect [1, 255]\n BTRFS error (device dm-2): read time tree block corruption detected on logical 30572544 mirror 2\n\n[ Rebase, add a Link: tag, add an simple cause analyze ]"}], "id": "CVE-2026-93813", "lastModified": "2026-10-03T11:17:51.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-24T17:17:14.763", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: btrfs: tree-checker: validate INODE_REF's namelen", "id": "2540541", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540541"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: tree-checker: validate INODE_REF's namelen\n[BUG]\nA crafted btrfs image can trigger the following crash:\nBUG: unable to handle page fault for address: ffffd1dc42884000\n#PF: supervisor write access in kernel mode\n#PF: error_code(0x0002) - not-present page\nCPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full) 46af0a92938a63be7132e0dfd71e62327c51d5c2\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\nRIP: 0010:memcpy+0xc/0x10\nCall Trace:\n<TASK>\nread_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\nbtrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\nreconnect_path+0x165/0x390\nexportfs_decode_fh_raw+0x337/0x400\n? drop_caches_sysctl_handler+0xb0/0xb0\n</TASK>\n---[ end trace 0000000000000000 ]---\nRIP: 0010:memcpy+0xc/0x10\nKernel panic - not syncing: Fatal exception\n[CAUSE]\nTThe crafted image has the following corrupted INODE_REF item:\nitem 9 key (258 INODE_REF 257) itemoff 11544 itemsize 4106\nindex 2 namelen 4096 name: d\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\nThe itemsize matches the namelen, but the namelen is 4096, way larger\nthan normal name length limit (BTRFS_NAME_LEN, 255).\nMeanwhile the memory of the @name is only 255 byte sized, this will cause\nout-of-boundary access, and cause the above crash.\n[FIX]\nAdd extra namelen verification for INODE_REF, just like what we have\ndone in ROOT_REF checks.\nNow the crafted image can be rejected gracefully:\nBTRFS critical (device dm-2): corrupt leaf: root=5 block=30572544 slot=14 ino=259, invalid inode ref name length, has 4096 expect [1, 255]\nBTRFS error (device dm-2): read time tree block corruption detected on logical 30572544 mirror 2\n[ Rebase, add a Link: tag, add an simple cause analyze ]", "A flaw was found in the Linux kernel's Btrfs file system. The file system validation mechanism fails to properly verify file name lengths in file reference entries, leading to an out-of-bounds memory access when processing corrupted data. A local attacker can exploit this issue by mounting or processing a specially crafted Btrfs file system image, causing the operating system to crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-93813", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93813\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93813\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93813.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,eeddee090b834a7d4b6a8214d2e3739e64c7a338)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8f75c19892263bc0555fba922aefe103e841e86d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3dc22abc21f5892406c09202fa2627196cc96967)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-24T20:30:17.879286+00:00", "updated": "2026-10-01T20:45:12.586547+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}