{"id":"CVE-2026-64565","state":"PUBLISHED","title":"Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()\n\nThe `ims_pcu_process_data()` processes incoming URB data byte by byte.\nHowever, it fails to check if the `read_pos` index exceeds\nIMS_PCU_BUF_SIZE.\n\nIf a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE,\n`read_pos` will increment indefinitely. Moreover, since `read_pos` is\nlocated immediately after `read_buf`, the attacker can overwrite\n`read_pos` itself to arbitrarily control the index.\n\nThis manipulated `read_pos` is subsequently used in\n`ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a\nheap buffer overflow.\n\nSpecifically, an attacker can overwrite the `cmd_done.wait.head` located\nat offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`.\nConsequently, when the driver calls `complete(&pcu->cmd_done)`, it\ntriggers a control flow hijack by using the manipulated pointer.\n\nFix this by adding a bounds check for `read_pos` before writing to\n`read_buf`. If the packet is too long, discard it, log a warning,\nand reset the parser state.\n\n[dtor: factor out resetting packet state, reset checksum as well]","publishedAt":"2026-08-04T06:23:24.089Z","updatedAt":"2026-08-19T16:28:39.404Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"06cfff93fd40441292567b999091beab11c74504","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"992a7173364dcf63e30012af43da3c2f279839f9","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"3a801bc75ba1d121d0ed60e7234f93ba5651d87d","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"40bbbf2e91fd60715525bf0405c67876af817edf","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"d03a740e087de7dcb2a26dc1123377bd3d1d84ca","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"875115b82c295277b81b6dfee7debc725f44e854","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/misc/ims-pcu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/misc/ims-pcu.c"]}],"references":["https://git.kernel.org/stable/c/06cfff93fd40441292567b999091beab11c74504","https://git.kernel.org/stable/c/992a7173364dcf63e30012af43da3c2f279839f9","https://git.kernel.org/stable/c/3a801bc75ba1d121d0ed60e7234f93ba5651d87d","https://git.kernel.org/stable/c/40bbbf2e91fd60715525bf0405c67876af817edf","https://git.kernel.org/stable/c/ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49","https://git.kernel.org/stable/c/d03a740e087de7dcb2a26dc1123377bd3d1d84ca","https://git.kernel.org/stable/c/875115b82c295277b81b6dfee7debc725f44e854"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64565.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64565","state":"PUBLISHED","datePublished":"2026-08-04T06:23:24.089Z","dateUpdated":"2026-08-19T16:28:39.404Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.797Z"},"containers":{"cna":{"title":"Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()\n\nThe `ims_pcu_process_data()` processes incoming URB data byte by byte.\nHowever, it fails to check if the `read_pos` index exceeds\nIMS_PCU_BUF_SIZE.\n\nIf a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE,\n`read_pos` will increment indefinitely. Moreover, since `read_pos` is\nlocated immediately after `read_buf`, the attacker can overwrite\n`read_pos` itself to arbitrarily control the index.\n\nThis manipulated `read_pos` is subsequently used in\n`ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a\nheap buffer overflow.\n\nSpecifically, an attacker can overwrite the `cmd_done.wait.head` located\nat offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`.\nConsequently, when the driver calls `complete(&pcu->cmd_done)`, it\ntriggers a control flow hijack by using the manipulated pointer.\n\nFix this by adding a bounds check for `read_pos` before writing to\n`read_buf`. If the packet is too long, discard it, log a warning,\nand reset the parser state.\n\n[dtor: factor out resetting packet state, reset checksum as well]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"06cfff93fd40441292567b999091beab11c74504","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"992a7173364dcf63e30012af43da3c2f279839f9","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"3a801bc75ba1d121d0ed60e7234f93ba5651d87d","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"40bbbf2e91fd60715525bf0405c67876af817edf","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"d03a740e087de7dcb2a26dc1123377bd3d1d84ca","versionType":"git"},{"version":"628329d52474323938a03826941e166bc7c8eff4","status":"affected","lessThan":"875115b82c295277b81b6dfee7debc725f44e854","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/misc/ims-pcu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/misc/ims-pcu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/06cfff93fd40441292567b999091beab11c74504"},{"url":"https://git.kernel.org/stable/c/992a7173364dcf63e30012af43da3c2f279839f9"},{"url":"https://git.kernel.org/stable/c/3a801bc75ba1d121d0ed60e7234f93ba5651d87d"},{"url":"https://git.kernel.org/stable/c/40bbbf2e91fd60715525bf0405c67876af817edf"},{"url":"https://git.kernel.org/stable/c/ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49"},{"url":"https://git.kernel.org/stable/c/d03a740e087de7dcb2a26dc1123377bd3d1d84ca"},{"url":"https://git.kernel.org/stable/c/875115b82c295277b81b6dfee7debc725f44e854"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:28:39.404Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}