{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49956", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.382Z", "datePublished": "2025-06-18T11:00:18.341Z", "dateUpdated": "2026-08-05T08:56:53.613Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:53.613Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8712: fix use after free bugs\n\n_Read/Write_MACREG callbacks are NULL so the read/write_macreg_hdl()\nfunctions don't do anything except free the \"pcmd\" pointer. It\nresults in a use after free. Delete them." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is in the rtl8712 host-to-firmware cmd filter (`cmd_hdl_filter` → `r8712_cmd_thread`), a local driver software path for queued `cmd_obj`s, not WiFi-frame RX (Adjacent) or USB probe/URB handling (Physical); adapter presence is an environmental precondition.\nAC:H - Triggering requires a `_Read_MACREG`/`_Write_MACREG` `cmd_obj` on the cmd queue, but no in-tree caller has ever enqueued those codes since the driver was added—success depends on a condition the attacker cannot influence.\nPR:L - If those H2C commands were issued, they would come from wireless management paths gated by `CAP_NET_ADMIN`; per kernel CNA guidance that capability is reachable via user namespaces, so Privileges Required is Low rather than High.\nUI:N - Command dequeue and filter execution run entirely in the driver's cmd thread with no separate victim action such as mounting a filesystem or confirming a prompt.\nS:U - The resulting heap UAF/double-free stays inside the host kernel's security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After `r8712_free_cmd_obj()` the freed `cmd_obj` is reused for `cmdcode`/`parmbuf`/`cmdsz` reads; per kernel UAF guidance that enables disclosure of reclaimed heap contents.\nI:H - The same path later double-frees `pcmd`, a classic heap UAF/double-free primitive that can be groomed into arbitrary write or control-flow hijack, so Integrity is High.\nA:H - Use-after-free and double-free of `cmd_obj` cause kernel oops/KASAN/BUG failures in the cmd thread, which is Availability High under kernel CVSS guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/rtl8712/rtl8712_cmd.c" ], "versions": [ { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "7dce6b0ee7d78667d6c831ced957a08769973063", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "376e15487fec837301d888068a3fcc82efb6171a", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "d0aac7146e96bf39e79c65087d21dfa02ef8db38", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "19e3f69d19801940abc2ac37c169882769ed9770", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "dc02aaf950015850e7589696521c7fca767cea77", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "b1727def850904e4b8ba384043775672841663a1", "status": "affected", "versionType": "git" }, { "version": "2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef", "lessThan": "e230a4455ac3e9b112f0367d1b8e255e141afae0", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/rtl8712/rtl8712_cmd.c" ], "versions": [ { "version": "2.6.37", "status": "affected" }, { "version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.328", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.293", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.258", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.213", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.142", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.66", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.8", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "4.9.328" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "4.14.293" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "4.19.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.4.213" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.10.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.15.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.19.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7dce6b0ee7d78667d6c831ced957a08769973063" }, { "url": "https://git.kernel.org/stable/c/376e15487fec837301d888068a3fcc82efb6171a" }, { "url": "https://git.kernel.org/stable/c/9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27" }, { "url": "https://git.kernel.org/stable/c/d0aac7146e96bf39e79c65087d21dfa02ef8db38" }, { "url": "https://git.kernel.org/stable/c/19e3f69d19801940abc2ac37c169882769ed9770" }, { "url": "https://git.kernel.org/stable/c/dc02aaf950015850e7589696521c7fca767cea77" }, { "url": "https://git.kernel.org/stable/c/b1727def850904e4b8ba384043775672841663a1" }, { "url": "https://git.kernel.org/stable/c/e230a4455ac3e9b112f0367d1b8e255e141afae0" } ], "title": "staging: rtl8712: fix use after free bugs", "x_generator": { "engine": "bippy-1.2.0" } } } }