{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38227", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.995Z", "datePublished": "2025-07-04T13:37:41.922Z", "dateUpdated": "2026-08-05T12:00:30.091Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:30.091Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vidtv: Terminating the subsequent process of initialization failure\n\nsyzbot reported a slab-use-after-free Read in vidtv_mux_init. [1]\n\nAfter PSI initialization fails, the si member is accessed again, resulting\nin this uaf.\n\nAfter si initialization fails, the subsequent process needs to be exited.\n\n[1]\nBUG: KASAN: slab-use-after-free in vidtv_mux_pid_ctx_init drivers/media/test-drivers/vidtv/vidtv_mux.c:78 [inline]\nBUG: KASAN: slab-use-after-free in vidtv_mux_init+0xac2/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:524\nRead of size 8 at addr ffff88802fa42acc by task syz.2.37/6059\n\nCPU: 0 UID: 0 PID: 6059 Comm: syz.2.37 Not tainted 6.14.0-rc5-syzkaller #0\nHardware name: Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n\n__dump_stack lib/dump_stack.c:94 [inline]\ndump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\nprint_address_description mm/kasan/report.c:408 [inline]\nprint_report+0xc3/0x670 mm/kasan/report.c:521\nkasan_report+0xd9/0x110 mm/kasan/report.c:634\nvidtv_mux_pid_ctx_init drivers/media/test-drivers/vidtv/vidtv_mux.c:78\nvidtv_mux_init+0xac2/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:524\nvidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194\nvidtv_start_feed drivers/media/test-drivers/vidtv/vidtv_bridge.c:239\ndmx_section_feed_start_filtering drivers/media/dvb-core/dvb_demux.c:973\ndvb_dmxdev_feed_start drivers/media/dvb-core/dmxdev.c:508 [inline]\ndvb_dmxdev_feed_restart.isra.0 drivers/media/dvb-core/dmxdev.c:537\ndvb_dmxdev_filter_stop+0x2b4/0x3a0 drivers/media/dvb-core/dmxdev.c:564\ndvb_dmxdev_filter_free drivers/media/dvb-core/dmxdev.c:840 [inline]\ndvb_demux_release+0x92/0x550 drivers/media/dvb-core/dmxdev.c:1246\n__fput+0x3ff/0xb70 fs/file_table.c:464\ntask_work_run+0x14e/0x250 kernel/task_work.c:227\nexit_task_work include/linux/task_work.h:40 [inline]\ndo_exit+0xad8/0x2d70 kernel/exit.c:938\ndo_group_exit+0xd3/0x2a0 kernel/exit.c:1087\n__do_sys_exit_group kernel/exit.c:1098 [inline]\n__se_sys_exit_group kernel/exit.c:1096 [inline]\n__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096\nx64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f871d58d169\nCode: Unable to access opcode bytes at 0x7f871d58d13f.\nRSP: 002b:00007fff4b19a788 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f871d58d169\nRDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: 00007fff4b19a7ec R08: 0000000b4b19a87f R09: 00000000000927c0\nR10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003\nR13: 00000000000927c0 R14: 000000000001d553 R15: 00007fff4b19a840\n \n\nAllocated by task 6059:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394\n kmalloc_noprof include/linux/slab.h:901 [inline]\n kzalloc_noprof include/linux/slab.h:1037 [inline]\n vidtv_psi_pat_table_init drivers/media/test-drivers/vidtv/vidtv_psi.c:970\n vidtv_channel_si_init drivers/media/test-drivers/vidtv/vidtv_channel.c:423\n vidtv_mux_init drivers/media/test-drivers/vidtv/vidtv_mux.c:519\n vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194\n vidtv_start_feed drivers/media/test-drivers/vidtv/vidtv_bridge.c:239\n dmx_section_feed_start_filtering drivers/media/dvb-core/dvb_demux.c:973\n dvb_dmxdev_feed_start drivers/media/dvb-core/dmxdev.c:508 [inline]\n dvb_dmxdev_feed_restart.isra.0 drivers/media/dvb-core/dmxdev.c:537\n dvb_dmxdev_filter_stop+0x2b4/0x3a0 drivers/media/dvb-core/dmxdev.c:564\n dvb_dmxdev_filter_free drivers/media/dvb-core/dmxdev.c:840 [inline]\n dvb_demux_release+0x92/0x550 drivers/media/dvb-core/dmxdev.c:1246\n __fput+0x3ff/0xb70 fs/file_tabl\n---truncated---" } ], "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 vulnerability is reached only through the local DVB character device `/dev/dvb/adapterN/demux0` via the `DMX_SET_FILTER`/`DMX_START` ioctl sequence. No network or remote data path feeds `vidtv_mux_init()`.\nAC:L - The only precondition is an allocation failure inside `vidtv_channel_si_init()`, which a local attacker can induce with memory/slab pressure, and the feed start/stop sequence can be retried without limit until one attempt hits the error path. The subsequent use-after-free is deterministic once the failure occurs, and the attacker also controls the heap spray that reclaims the freed PAT object.\nPR:L - Only an open file descriptor on the DVB demux node is required; udev's `70-uaccess.rules` grants the active local user an ACL on `SUBSYSTEM==\"dvb\"` nodes (and `50-udev-default.rules` puts them in group `video`). No capability check exists anywhere between the ioctl entry and `vidtv_mux_init()`.\nUI:N - The attacker performs the entire open/ioctl/close sequence itself in a single process; no victim action or cooperation is needed.\nS:U - The corruption stays within the kernel's own memory and security authority, with no crossing into a hypervisor, IOMMU, or other separate security scope.\nC:H - The freed `struct vidtv_psi_table_pat` lives in a general-purpose kmalloc cache the attacker can reclaim, after which `vidtv_mux_pid_ctx_init()` and the periodic `vidtv_mux_push_si()` worker walk an attacker-controlled `program` linked list and use an attacker-controlled `num_pmt` as an index bound, yielding an arbitrary kernel read primitive.\nI:H - The streaming worker writes back into the freed objects (`vidtv_psi_pat_table_update_sec_len()` updates the section length, continuity counters are updated through freed contexts), and teardown double-frees the PAT/SDT/NIT/EIT tables, giving freelist corruption that is a well-established route to controlled kernel writes and privilege escalation.\nA:H - Even unexploited, the use-after-free reliably produces a KASAN-reported bad dereference, a wild pointer walk of the freed program list, or a NULL/OOB access on `m->si.pmt_secs`, and the double-free corrupts the slab allocator — all leading to an oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/test-drivers/vidtv/vidtv_channel.c" ], "versions": [ { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "e1d72ff111eceea6b28dccb7ca4e8f4900b11729", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "7e62be1f3b241bc9faee547864bb39332955509b", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "685c18bc5a36f823ee725e85aac1303ef5f535ba", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "9824e1732a163e005aa84e12ec439493ebd4f097", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "72541cae73d0809a6416bfcd2ee6473046a0013a", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "f8c2483be6e8bb6c2148315b4a924c65bb442b5e", "status": "affected", "versionType": "git" }, { "version": "3be8037960bccd13052cfdeba8805ad785041d70", "lessThan": "1d5f88f053480326873115092bc116b7d14916ba", "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/media/test-drivers/vidtv/vidtv_channel.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.239", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.186", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.95", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.35", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.10", "versionEndExcluding": "5.10.239" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.186" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.15.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e1d72ff111eceea6b28dccb7ca4e8f4900b11729" }, { "url": "https://git.kernel.org/stable/c/7e62be1f3b241bc9faee547864bb39332955509b" }, { "url": "https://git.kernel.org/stable/c/685c18bc5a36f823ee725e85aac1303ef5f535ba" }, { "url": "https://git.kernel.org/stable/c/9824e1732a163e005aa84e12ec439493ebd4f097" }, { "url": "https://git.kernel.org/stable/c/72541cae73d0809a6416bfcd2ee6473046a0013a" }, { "url": "https://git.kernel.org/stable/c/f8c2483be6e8bb6c2148315b4a924c65bb442b5e" }, { "url": "https://git.kernel.org/stable/c/1d5f88f053480326873115092bc116b7d14916ba" } ], "title": "media: vidtv: Terminating the subsequent process of initialization failure", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:35:44.869Z" } } ] } }