{"id":"CVE-2024-27005","state":"PUBLISHED","title":"interconnect: Don't access req_list while it's being manipulated","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ninterconnect: Don't access req_list while it's being manipulated\n\nThe icc_lock mutex was split into separate icc_lock and icc_bw_lock\nmutexes in [1] to avoid lockdep splats. However, this didn't adequately\nprotect access to icc_node::req_list.\n\nThe icc_set_bw() function will eventually iterate over req_list while\nonly holding icc_bw_lock, but req_list can be modified while only\nholding icc_lock. This causes races between icc_set_bw(), of_icc_get(),\nand icc_put().\n\nExample A:\n\n  CPU0                               CPU1\n  ----                               ----\n  icc_set_bw(path_a)\n    mutex_lock(&icc_bw_lock);\n                                     icc_put(path_b)\n                                       mutex_lock(&icc_lock);\n    aggregate_requests()\n      hlist_for_each_entry(r, ...\n                                       hlist_del(...\n        <r = invalid pointer>\n\nExample B:\n\n  CPU0                               CPU1\n  ----                               ----\n  icc_set_bw(path_a)\n    mutex_lock(&icc_bw_lock);\n                                     path_b = of_icc_get()\n                                       of_icc_get_by_index()\n                                         mutex_lock(&icc_lock);\n                                         path_find()\n                                           path_init()\n    aggregate_requests()\n      hlist_for_each_entry(r, ...\n                                             hlist_add_head(...\n        <r = invalid pointer>\n\nFix this by ensuring icc_bw_lock is always held before manipulating\nicc_node::req_list. The additional places icc_bw_lock is held don't\nperform any memory allocations, so we should still be safe from the\noriginal lockdep splats that motivated the separate locks.\n\n[1] commit af42269c3523 (\"interconnect: Fix locking for runpm vs reclaim\")","publishedAt":"2024-05-01T05:28:59.193Z","updatedAt":"2026-10-30T12:18:05.338Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/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":"9be2957f014d91088db1eb5dd09d9a03d7184dce","status":"affected","lessThan":"fe549d8e976300d0dd75bd904eb216bed8b145e0","versionType":"git"},{"version":"ee42bfc791aa3cd78e29046f26a09d189beb3efb","status":"affected","lessThan":"19ec82b3cad1abef2a929262b8c1528f4e0c192d","versionType":"git"},{"version":"ffb8917c70a4c88725ee40f9eeee9240ad1c1869","status":"affected","lessThan":"8401bc2c188030fb14d1cb43c402a1cf42d86dd2","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"d0d04efa2e367921654b5106cc5c05e3757c2b42","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"4c65507121ea8e0b47fae6d2049c8688390d46b6","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"de1bf25b6d771abdb52d43546cf57ad775fb68a1","versionType":"git"},{"version":"2f3a124696d43de3c837f87a9f767c56ee86cf2a","status":"affected","versionType":"git"},{"version":"5.15.133","status":"affected","lessThan":"5.15.151","versionType":"semver"},{"version":"6.1.55","status":"affected","lessThan":"6.1.81","versionType":"semver"},{"version":"6.5.5","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/interconnect/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"5.15.151","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.81","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.29","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.8.8","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/interconnect/core.c"]}],"references":["https://git.kernel.org/stable/c/fe549d8e976300d0dd75bd904eb216bed8b145e0","https://git.kernel.org/stable/c/19ec82b3cad1abef2a929262b8c1528f4e0c192d","https://git.kernel.org/stable/c/8401bc2c188030fb14d1cb43c402a1cf42d86dd2","https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42","https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6","https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/"],"weaknesses":[],"ingestedAt":"2026-10-30T12:34:06.950Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/27xxx/CVE-2024-27005.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-27005","state":"PUBLISHED","datePublished":"2024-05-01T05:28:59.193Z","dateUpdated":"2026-10-30T12:18:05.338Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.207Z"},"containers":{"cna":{"title":"interconnect: Don't access req_list while it's being manipulated","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ninterconnect: Don't access req_list while it's being manipulated\n\nThe icc_lock mutex was split into separate icc_lock and icc_bw_lock\nmutexes in [1] to avoid lockdep splats. However, this didn't adequately\nprotect access to icc_node::req_list.\n\nThe icc_set_bw() function will eventually iterate over req_list while\nonly holding icc_bw_lock, but req_list can be modified while only\nholding icc_lock. This causes races between icc_set_bw(), of_icc_get(),\nand icc_put().\n\nExample A:\n\n  CPU0                               CPU1\n  ----                               ----\n  icc_set_bw(path_a)\n    mutex_lock(&icc_bw_lock);\n                                     icc_put(path_b)\n                                       mutex_lock(&icc_lock);\n    aggregate_requests()\n      hlist_for_each_entry(r, ...\n                                       hlist_del(...\n        <r = invalid pointer>\n\nExample B:\n\n  CPU0                               CPU1\n  ----                               ----\n  icc_set_bw(path_a)\n    mutex_lock(&icc_bw_lock);\n                                     path_b = of_icc_get()\n                                       of_icc_get_by_index()\n                                         mutex_lock(&icc_lock);\n                                         path_find()\n                                           path_init()\n    aggregate_requests()\n      hlist_for_each_entry(r, ...\n                                             hlist_add_head(...\n        <r = invalid pointer>\n\nFix this by ensuring icc_bw_lock is always held before manipulating\nicc_node::req_list. The additional places icc_bw_lock is held don't\nperform any memory allocations, so we should still be safe from the\noriginal lockdep splats that motivated the separate locks.\n\n[1] commit af42269c3523 (\"interconnect: Fix locking for runpm vs reclaim\")"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9be2957f014d91088db1eb5dd09d9a03d7184dce","status":"affected","lessThan":"fe549d8e976300d0dd75bd904eb216bed8b145e0","versionType":"git"},{"version":"ee42bfc791aa3cd78e29046f26a09d189beb3efb","status":"affected","lessThan":"19ec82b3cad1abef2a929262b8c1528f4e0c192d","versionType":"git"},{"version":"ffb8917c70a4c88725ee40f9eeee9240ad1c1869","status":"affected","lessThan":"8401bc2c188030fb14d1cb43c402a1cf42d86dd2","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"d0d04efa2e367921654b5106cc5c05e3757c2b42","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"4c65507121ea8e0b47fae6d2049c8688390d46b6","versionType":"git"},{"version":"af42269c3523492d71ebbe11fefae2653e9cdc78","status":"affected","lessThan":"de1bf25b6d771abdb52d43546cf57ad775fb68a1","versionType":"git"},{"version":"2f3a124696d43de3c837f87a9f767c56ee86cf2a","status":"affected","versionType":"git"},{"version":"5.15.133","status":"affected","lessThan":"5.15.151","versionType":"semver"},{"version":"6.1.55","status":"affected","lessThan":"6.1.81","versionType":"semver"},{"version":"6.5.5","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/interconnect/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"5.15.151","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.81","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.29","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.8.8","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/interconnect/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/fe549d8e976300d0dd75bd904eb216bed8b145e0"},{"url":"https://git.kernel.org/stable/c/19ec82b3cad1abef2a929262b8c1528f4e0c192d"},{"url":"https://git.kernel.org/stable/c/8401bc2c188030fb14d1cb43c402a1cf42d86dd2"},{"url":"https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42"},{"url":"https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6"},{"url":"https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1"}],"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 - The interconnect framework is reached only through local syscall paths — V4L2 ioctls on /dev/videoN (venus), DRM render-node submissions driving GPU devfreq, block I/O driving UFS/eMMC clock scaling — all of which require local access to the device. No network-facing protocol handler reaches `icc_set_bw()` or `icc_put()`.\nAC:L - The attacker directly controls the reading side of the race and can spin it in a tight loop (repeated `VIDIOC_STREAMON`/`STREAMOFF` on /dev/videoN, or continuous GPU/IO load forcing OPP bandwidth transitions), so the `req_list` walk in `aggregate_requests()` can be issued arbitrarily often against recurring `path_init()`/`icc_put()` mutations, with unlimited retries and no condition outside the attacker's influence gating success.\nPR:L - An ordinary unprivileged local account suffices — access to /dev/videoN (video/media group, or any app on Android), /dev/dri/renderD128, or simply generating filesystem I/O is enough to drive `icc_set_bw()` into `aggregate_requests()`. No capability, root, or namespace privilege is required.\nUI:N - The attacker's own process triggers both the bandwidth-vote storm and the racing condition entirely on its own. No victim action, no file to open, no filesystem to mount.\nS:U - The corruption is confined to kernel heap objects and interconnect provider state within the same kernel security authority. There is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The list walk continues through a `kfree()`d `struct icc_path` from a general-purpose kmalloc cache, so a sprayed `req_node.next` steers subsequent iterations to arbitrary kernel addresses, reading `enabled`/`tag`/`avg_bw`/`peak_bw` from them; those values surface in `node->avg_bw`/`peak_bw`, giving a use-after-free based arbitrary-read primitive.\nI:H - This is a use-after-free plus hlist corruption on a `GFP_KERNEL` kmalloc object, which is a standard heap-spray and write-primitive foundation; concretely, garbage read from freed memory is aggregated into `node->avg_bw`/`peak_bw` and programmed into interconnect hardware through `apply_constraints()` → `p->set()`, corrupting system bus configuration.\nA:H - `icc_put()` uses `hlist_del()` (leaving `LIST_POISON1` in `next`) immediately followed by `kfree(path)`, so a racing `hlist_for_each_entry()` dereferences a poison or dangling pointer and oopses/panics the kernel; `hlist_add_head()` racing the same walk can likewise send it into a corrupted chain."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:18:05.338Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.133","versionEndExcluding":"5.15.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.55","versionEndExcluding":"6.1.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.29"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.8.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.5"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.3,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-06-06T18:46:13.449387Z","id":"CVE-2024-27005","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-11-05T15:17:57.462Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1","tags":["x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-04T17:16:33.949Z"}}]}}}