{"id":"CVE-2022-49956","state":"PUBLISHED","title":"staging: rtl8712: fix use after free bugs","description":"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.","publishedAt":"2025-06-18T11:00:18.341Z","updatedAt":"2026-08-05T08:56:53.613Z","severity":{"score":7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/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":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"7dce6b0ee7d78667d6c831ced957a08769973063","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"376e15487fec837301d888068a3fcc82efb6171a","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"d0aac7146e96bf39e79c65087d21dfa02ef8db38","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"19e3f69d19801940abc2ac37c169882769ed9770","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"dc02aaf950015850e7589696521c7fca767cea77","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"b1727def850904e4b8ba384043775672841663a1","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"e230a4455ac3e9b112f0367d1b8e255e141afae0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/staging/rtl8712/rtl8712_cmd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.37","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.37","versionType":"semver"},{"version":"4.9.328","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.293","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.258","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.213","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.142","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.66","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.8","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/staging/rtl8712/rtl8712_cmd.c"]}],"references":["https://git.kernel.org/stable/c/7dce6b0ee7d78667d6c831ced957a08769973063","https://git.kernel.org/stable/c/376e15487fec837301d888068a3fcc82efb6171a","https://git.kernel.org/stable/c/9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27","https://git.kernel.org/stable/c/d0aac7146e96bf39e79c65087d21dfa02ef8db38","https://git.kernel.org/stable/c/19e3f69d19801940abc2ac37c169882769ed9770","https://git.kernel.org/stable/c/dc02aaf950015850e7589696521c7fca767cea77","https://git.kernel.org/stable/c/b1727def850904e4b8ba384043775672841663a1","https://git.kernel.org/stable/c/e230a4455ac3e9b112f0367d1b8e255e141afae0"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49956.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49956","state":"PUBLISHED","datePublished":"2025-06-18T11:00:18.341Z","dateUpdated":"2026-08-05T08:56:53.613Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-06-18T10:57:27.382Z"},"containers":{"cna":{"title":"staging: rtl8712: fix use after free bugs","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"7dce6b0ee7d78667d6c831ced957a08769973063","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"376e15487fec837301d888068a3fcc82efb6171a","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"d0aac7146e96bf39e79c65087d21dfa02ef8db38","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"19e3f69d19801940abc2ac37c169882769ed9770","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"dc02aaf950015850e7589696521c7fca767cea77","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"b1727def850904e4b8ba384043775672841663a1","versionType":"git"},{"version":"2865d42c78a9121caad52cb02d1fbb7f5cdbc4ef","status":"affected","lessThan":"e230a4455ac3e9b112f0367d1b8e255e141afae0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/staging/rtl8712/rtl8712_cmd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.37","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.37","versionType":"semver"},{"version":"4.9.328","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.293","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.258","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.213","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.142","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.66","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.8","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/staging/rtl8712/rtl8712_cmd.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:56:53.613Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}