{"id":"CVE-2025-38323","state":"PUBLISHED","title":"net: atm: add lec_mutex","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: add lec_mutex\n\nsyzbot found its way in net/atm/lec.c, and found an error path\nin lecd_attach() could leave a dangling pointer in dev_lec[].\n\nAdd a mutex to protect dev_lecp[] uses from lecd_attach(),\nlec_vcc_attach() and lec_mcast_attach().\n\nFollowing patch will use this mutex for /proc/net/atm/lec.\n\nBUG: KASAN: slab-use-after-free in lecd_attach net/atm/lec.c:751 [inline]\nBUG: KASAN: slab-use-after-free in lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008\nRead of size 8 at addr ffff88807c7b8e68 by task syz.1.17/6142\n\nCPU: 1 UID: 0 PID: 6142 Comm: syz.1.17 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xcd/0x680 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n lecd_attach net/atm/lec.c:751 [inline]\n lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \n\nAllocated by task 6132:\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 kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4328 [inline]\n __kvmalloc_node_noprof+0x27b/0x620 mm/slub.c:5015\n alloc_netdev_mqs+0xd2/0x1570 net/core/dev.c:11711\n lecd_attach net/atm/lec.c:737 [inline]\n lane_ioctl+0x17db/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 6132:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2381 [inline]\n slab_free mm/slub.c:4643 [inline]\n kfree+0x2b4/0x4d0 mm/slub.c:4842\n free_netdev+0x6c5/0x910 net/core/dev.c:11892\n lecd_attach net/atm/lec.c:744 [inline]\n lane_ioctl+0x1ce8/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893","publishedAt":"2025-07-10T08:14:58.212Z","updatedAt":"2026-05-11T21:25:45.739Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e91274cc7ed88ab5bdc62d426067c82b0b118a0b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a7a713dfb5f9477345450f27c7c0741864511192","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"17e156a94e94a906a570dbf9b48877956c60bef8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18e8f0c4f826fb08c2d3825cdd6c57e24b207e0a","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"dffd03422ae6a459039c8602f410e6c0f4cbc6c8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f4d80b16ecc4229f7e6345158ef34c36be323f0e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"64b378db28a967f7b271b055380c2360279aa424","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d13a3824bfd2b4774b671a75cf766a16637a0e67","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/lec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.4.295","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.239","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.186","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.142","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.95","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.35","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.4","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/lec.c"]}],"references":["https://git.kernel.org/stable/c/e91274cc7ed88ab5bdc62d426067c82b0b118a0b","https://git.kernel.org/stable/c/a7a713dfb5f9477345450f27c7c0741864511192","https://git.kernel.org/stable/c/17e156a94e94a906a570dbf9b48877956c60bef8","https://git.kernel.org/stable/c/18e8f0c4f826fb08c2d3825cdd6c57e24b207e0a","https://git.kernel.org/stable/c/dffd03422ae6a459039c8602f410e6c0f4cbc6c8","https://git.kernel.org/stable/c/f4d80b16ecc4229f7e6345158ef34c36be323f0e","https://git.kernel.org/stable/c/64b378db28a967f7b271b055380c2360279aa424","https://git.kernel.org/stable/c/d13a3824bfd2b4774b671a75cf766a16637a0e67","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38323.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38323","state":"PUBLISHED","datePublished":"2025-07-10T08:14:58.212Z","dateUpdated":"2026-05-11T21:25:45.739Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.004Z"},"containers":{"cna":{"title":"net: atm: add lec_mutex","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: add lec_mutex\n\nsyzbot found its way in net/atm/lec.c, and found an error path\nin lecd_attach() could leave a dangling pointer in dev_lec[].\n\nAdd a mutex to protect dev_lecp[] uses from lecd_attach(),\nlec_vcc_attach() and lec_mcast_attach().\n\nFollowing patch will use this mutex for /proc/net/atm/lec.\n\nBUG: KASAN: slab-use-after-free in lecd_attach net/atm/lec.c:751 [inline]\nBUG: KASAN: slab-use-after-free in lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008\nRead of size 8 at addr ffff88807c7b8e68 by task syz.1.17/6142\n\nCPU: 1 UID: 0 PID: 6142 Comm: syz.1.17 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xcd/0x680 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n lecd_attach net/atm/lec.c:751 [inline]\n lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \n\nAllocated by task 6132:\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 kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4328 [inline]\n __kvmalloc_node_noprof+0x27b/0x620 mm/slub.c:5015\n alloc_netdev_mqs+0xd2/0x1570 net/core/dev.c:11711\n lecd_attach net/atm/lec.c:737 [inline]\n lane_ioctl+0x17db/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 6132:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2381 [inline]\n slab_free mm/slub.c:4643 [inline]\n kfree+0x2b4/0x4d0 mm/slub.c:4842\n free_netdev+0x6c5/0x910 net/core/dev.c:11892\n lecd_attach net/atm/lec.c:744 [inline]\n lane_ioctl+0x1ce8/0x23e0 net/atm/lec.c:1008\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x118/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e91274cc7ed88ab5bdc62d426067c82b0b118a0b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a7a713dfb5f9477345450f27c7c0741864511192","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"17e156a94e94a906a570dbf9b48877956c60bef8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18e8f0c4f826fb08c2d3825cdd6c57e24b207e0a","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"dffd03422ae6a459039c8602f410e6c0f4cbc6c8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f4d80b16ecc4229f7e6345158ef34c36be323f0e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"64b378db28a967f7b271b055380c2360279aa424","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d13a3824bfd2b4774b671a75cf766a16637a0e67","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/lec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.4.295","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.239","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.186","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.142","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.95","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.35","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.4","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/lec.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e91274cc7ed88ab5bdc62d426067c82b0b118a0b"},{"url":"https://git.kernel.org/stable/c/a7a713dfb5f9477345450f27c7c0741864511192"},{"url":"https://git.kernel.org/stable/c/17e156a94e94a906a570dbf9b48877956c60bef8"},{"url":"https://git.kernel.org/stable/c/18e8f0c4f826fb08c2d3825cdd6c57e24b207e0a"},{"url":"https://git.kernel.org/stable/c/dffd03422ae6a459039c8602f410e6c0f4cbc6c8"},{"url":"https://git.kernel.org/stable/c/f4d80b16ecc4229f7e6345158ef34c36be323f0e"},{"url":"https://git.kernel.org/stable/c/64b378db28a967f7b271b055380c2360279aa424"},{"url":"https://git.kernel.org/stable/c/d13a3824bfd2b4774b671a75cf766a16637a0e67"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:25:45.739Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.4.295"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.239"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.186"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.95"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.15.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.16"}]}]}],"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":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T17:36:33.359Z"}}]}}}