CVE-2026-46086

{"id": "CVE-2026-46086", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "c502fa9f094cb03d1d1685c71e2105ab359bc2b8", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "a6ae4511c07b91f597e461406c6330f0d4ff810e", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "0b9e4bbfb7c949151e3acd44ed4aa33614d2e110", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "81af4137a30c4c2dc694dea8cacb180bd66000ef", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "5424e678f9b304e148cf5dcc047cffc7a56a3bb5", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "9a2d9d4e657b23dc21f24cf139e3aeff0b61341f", "versionType": "git"}, {"status": "affected", "version": "960b589f86c74ce582922fcb996103271081f4de", "lessThan": "df4601653201de21b487c3e7fffd464790cab808", "versionType": "git"}], "programFiles": ["net/bridge/br_arp_nd_proxy.c", "net/bridge/br_fdb.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.14"}, {"status": "unaffected", "version": "0", "lessThan": "3.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.86", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.27", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.4", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bridge/br_arp_nd_proxy.c", "net/bridge/br_fdb.c"], "defaultStatus": "affected"}]}], "published": "2026-05-27T14:17:30.080", "references": [{"url": "https://git.kernel.org/stable/c/0b9e4bbfb7c949151e3acd44ed4aa33614d2e110", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5424e678f9b304e148cf5dcc047cffc7a56a3bb5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/81af4137a30c4c2dc694dea8cacb180bd66000ef", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9a2d9d4e657b23dc21f24cf139e3aeff0b61341f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a6ae4511c07b91f597e461406c6330f0d4ff810e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c502fa9f094cb03d1d1685c71e2105ab359bc2b8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/df4601653201de21b487c3e7fffd464790cab808", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: use a stable FDB dst snapshot in RCU readers\n\nLocal FDB entries can be rewritten in place by `fdb_delete_local()`, which\nupdates `f->dst` to another port or to `NULL` while keeping the entry\nalive. Several bridge RCU readers inspect `f->dst`, including\n`br_fdb_fillbuf()` through the `brforward_read()` sysfs path.\n\nThese readers currently load `f->dst` multiple times and can therefore\nobserve inconsistent values across the check and later dereference.\nIn `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change\n`f->dst` after the NULL check and before the `port_no` dereference,\nleading to a NULL-ptr-deref.\n\nFix this by taking a single `READ_ONCE()` snapshot of `f->dst` in each\naffected RCU reader and using that snapshot for the rest of the access\nsequence. Also publish the in-place `f->dst` updates in `fdb_delete_local()`\nwith `WRITE_ONCE()` so the readers and writer use matching access patterns."}], "lastModified": "2026-06-24T17:08:46.907", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "381832F6-7D7D-4333-9276-B44B01372277", "versionEndExcluding": "5.10.259", "versionStartIncluding": "3.14.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801", "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757", "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A1A92866-F406-43B5-B2D1-CFC274753E9D", "versionEndExcluding": "6.6.140", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "55DA1C62-9991-451E-B8A8-E0004E00F789", "versionEndExcluding": "6.12.86", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A10AC84F-C058-47D5-85B4-E6E51A613B74", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "851B1505-0318-49F4-8D7C-196BE04FF173"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1795E18E-AE30-4230-809F-E40317FB96BD"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0F91AF02-7C23-4888-A580-07C166BE8128"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "61A7DB5C-EB54-4D4A-AB38-8060F13C8779"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4FF2C86B-7087-4EFC-A256-3AF313C25325"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "14AC6A73-D01C-44F4-9821-BAE9600E72D5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.14:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "055557BE-1FE9-45F5-8A95-F8D3C9B031E4"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}