CVE-2026-93125

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93125", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.087Z", "datePublished": "2026-09-17T16:11:29.895Z", "dateUpdated": "2026-10-30T12:36:03.562Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:36:03.562Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max\n\ncheck_kfunc_args() detects a kfunc argument named rdonly_buf_size or\nrdwr_buf_size and stores reg->var_off.value into meta->r0_size, a u64,\nand does not bound it. check_kfunc_call() later copies that value into\nthe returned register's mem_size field:\n\n meta->r0_size = reg->var_off.value;\n ...\n regs[BPF_REG_0].mem_size = meta.r0_size;\n\nregs[BPF_REG_0].mem_size is u32. A constant whose upper 32 bits are set\ngets truncated instead of causing a load-time rejection, so the verifier\nrecords a PTR_TO_MEM register with an approximately 4 GiB mem_size for\nwhatever allocation the kfunc returned. A later access check against\nthat register uses the truncated, wrong bound.\n\nReject rdonly_buf_size/rdwr_buf_size values that exceed U32_MAX at the\npoint meta->r0_size is set."}], "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_kfunc_args() takes the oversized rdonly_buf_size/rdwr_buf_size from the BPF program's own constant (reg->var_off.value) on the local bpf(BPF_PROG_LOAD) path (bpf_prog_load \u2192 bpf_check \u2192 check_kfunc_call). That immediate is not a field of a received packet or a ksmbd/nfsd message.\nAC:L - The attacker picks a 64-bit immediate with upper bits set (e.g. ~0ULL as in hid_rdesc_fixup_get_data_overflow) as the rdonly_buf_size/rdwr_buf_size argument; tnum_is_const succeeds and regs[BPF_REG_0].mem_size = meta.r0_size truncates deterministically, with no race or layout outside their control.\nPR:L - do_check_common() rejects BPF_PSEUDO_KFUNC_CALL unless env->bpf_capable, which bpf_check() sets from bpf_token_capable(token, CAP_BPF). CAP_BPF is a reduced capability and is delegable into a user namespace via a BPF token, so init-namespace root is not required.\nUI:N - The attacker loads the crafted program with bpf(BPF_PROG_LOAD) and runs it themselves via BPF_PROG_TEST_RUN or by attaching their own HID-BPF/io_uring struct_ops. No separate victim action such as mounting an image is required.\nS:U - The truncated PTR_TO_MEM mem_size lets the verified program read and write host kernel memory, which is a standard kernel privilege escalation in the same authority. It does not cross a KVM/Xen, IOMMU, or guest-to-host boundary.\nC:H - check_kfunc_call() copies the truncated r0_size into a PTR_TO_MEM register, so check_mem_region_access() allows loads of up to ~4 GiB. bpf_kfunc_call_test_get_rdonly_mem takes const int rdonly_buf_size: a value such as 0x1FFFFFFFF becomes -1, the size > 8 check fails open, and the 8-byte prog_test_ref_kfunc is treated as a 4 GiB readable buffer.\nI:H - rdwr_buf_size kfuncs (bpf_kfunc_call_test_get_rdwr_mem, hid_bpf_get_data, bpf_io_uring_get_region) mark R0 as writable PTR_TO_MEM. The same truncated mem_size lets check_mem_region_access() accept stores past the real object, which is an arbitrary kernel write.\nA:H - Those verifier-allowed out-of-bounds loads and stores overrun the kfunc's actual object (prog_test_struct from get_mem, hid_bpf_get_data's ctx_kern->data, or an io_uring mapped region) and can oops or panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "00bb52be60da16cd5ead4eb9f8ddc9a66d003ff2", "status": "affected", "versionType": "git"}, {"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "2147065d3a4e1d5d42ae553fef165f17ec5e0e79", "status": "affected", "versionType": "git"}, {"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "b6ac0b5732047d43172b9dfbe6b57b9b8de303c2", "status": "affected", "versionType": "git"}, {"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "93a20b14f8627b2d3486e3ec1d3f2e7275a506ec", "status": "affected", "versionType": "git"}, {"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "56a3846830ac95a472297d0cbba75cbff29540bb", "status": "affected", "versionType": "git"}, {"version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "lessThan": "2aaf67f0516fde29620d0edfc29c01b9ea7ad430", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "6.1", "status": "affected"}, {"version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.1", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/00bb52be60da16cd5ead4eb9f8ddc9a66d003ff2"}, {"url": "https://git.kernel.org/stable/c/2147065d3a4e1d5d42ae553fef165f17ec5e0e79"}, {"url": "https://git.kernel.org/stable/c/b6ac0b5732047d43172b9dfbe6b57b9b8de303c2"}, {"url": "https://git.kernel.org/stable/c/93a20b14f8627b2d3486e3ec1d3f2e7275a506ec"}, {"url": "https://git.kernel.org/stable/c/56a3846830ac95a472297d0cbba75cbff29540bb"}, {"url": "https://git.kernel.org/stable/c/2aaf67f0516fde29620d0edfc29c01b9ea7ad430"}], "title": "bpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "00bb52be60da16cd5ead4eb9f8ddc9a66d003ff2", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}, {"lessThan": "2147065d3a4e1d5d42ae553fef165f17ec5e0e79", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}, {"lessThan": "b6ac0b5732047d43172b9dfbe6b57b9b8de303c2", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}, {"lessThan": "93a20b14f8627b2d3486e3ec1d3f2e7275a506ec", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}, {"lessThan": "56a3846830ac95a472297d0cbba75cbff29540bb", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}, {"lessThan": "2aaf67f0516fde29620d0edfc29c01b9ea7ad430", "status": "affected", "version": "eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"lessThan": "6.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nbpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max\n\ncheck_kfunc_args() detects a kfunc argument named rdonly_buf_size or\nrdwr_buf_size and stores reg->var_off.value into meta->r0_size, a u64,\nand does not bound it. check_kfunc_call() later copies that value into\nthe returned register's mem_size field:\n\n meta->r0_size = reg->var_off.value;\n ...\n regs[BPF_REG_0].mem_size = meta.r0_size;\n\nregs[BPF_REG_0].mem_size is u32. A constant whose upper 32 bits are set\ngets truncated instead of causing a load-time rejection, so the verifier\nrecords a PTR_TO_MEM register with an approximately 4 GiB mem_size for\nwhatever allocation the kfunc returned. A later access check against\nthat register uses the truncated, wrong bound.\n\nReject rdonly_buf_size/rdwr_buf_size values that exceed U32_MAX at the\npoint meta->r0_size is set."}], "id": "CVE-2026-93125", "lastModified": "2026-10-30T13:20:57.950", "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": "2026-09-17T17:18:07.247", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/00bb52be60da16cd5ead4eb9f8ddc9a66d003ff2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2147065d3a4e1d5d42ae553fef165f17ec5e0e79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2aaf67f0516fde29620d0edfc29c01b9ea7ad430"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/56a3846830ac95a472297d0cbba75cbff29540bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/93a20b14f8627b2d3486e3ec1d3f2e7275a506ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6ac0b5732047d43172b9dfbe6b57b9b8de303c2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae,56a3846830ac95a472297d0cbba75cbff29540bb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb1f7f71c126c8fd50ea81af98f97c4b581ea4ae,2aaf67f0516fde29620d0edfc29c01b9ea7ad430)"}}], "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": "affected", "versions": {"scheme": "semver", "value": "6.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "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": "2026-09-19T07:15:13.938152+00:00", "updated": "2026-09-20T05:00:11.713657+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-197"]}