384 lines
23 KiB
JSON
384 lines
23 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21812",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-29T08:45:45.774Z",
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"datePublished": "2025-02-27T20:01:02.837Z",
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"dateUpdated": "2026-08-05T11:54:40.014Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:54:40.014Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: rcu protect dev->ax25_ptr\n\nsyzbot found a lockdep issue [1].\n\nWe should remove ax25 RTNL dependency in ax25_setsockopt()\n\nThis should also fix a variety of possible UAF in ax25.\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Not tainted\n------------------------------------------------------\nsyz.5.1818/12806 is trying to acquire lock:\n ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}, at: ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n\nbut task is already holding lock:\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #1 (sk_lock-AF_AX25){+.+.}-{0:0}:\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n lock_sock_nested+0x48/0x100 net/core/sock.c:3642\n lock_sock include/net/sock.h:1618 [inline]\n ax25_kill_by_device net/ax25/af_ax25.c:101 [inline]\n ax25_device_event+0x24d/0x580 net/ax25/af_ax25.c:146\n notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85\n __dev_notify_flags+0x207/0x400\n dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026\n dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:563\n dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:820\n sock_do_ioctl+0x240/0x460 net/socket.c:1234\n sock_ioctl+0x626/0x8e0 net/socket.c:1339\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n-> #0 (rtnl_mutex){+.+.}-{4:4}:\n check_prev_add kernel/locking/lockdep.c:3161 [inline]\n check_prevs_add kernel/locking/lockdep.c:3280 [inline]\n validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904\n __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n __mutex_lock_common kernel/locking/mutex.c:585 [inline]\n __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735\n ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n do_sock_setsockopt+0x3af/0x720 net/socket.c:2324\n __sys_setsockopt net/socket.c:2349 [inline]\n __do_sys_setsockopt net/socket.c:2355 [inline]\n __se_sys_setsockopt net/socket.c:2352 [inline]\n __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2352\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n lock(sk_lock-AF_AX25);\n lock(rtnl_mutex);\n lock(sk_lock-AF_AX25);\n lock(rtnl_mutex);\n\n *** DEADLOCK ***\n\n1 lock held by syz.5.1818/12806:\n #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 12806 Comm: syz.5.1818 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074\n check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206\n check_prev_add kernel/locking/lockdep.c:3161 [inline]\n check_prevs_add kernel/lockin\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The controllable attack path is an AF_AX25 socket driven by local syscalls (setsockopt SO_BINDTODEVICE, connect/sendmsg autobind, close), which is what both frees the ax25_dev and re-dereferences the dangling dev->ax25_ptr. Although received AX.25 frames also read dev->ax25_ptr in ax25_rcv(), an adjacent radio/L2 peer cannot itself cause the free, so the attacker must be local.\nAC:L - No race needs to be won: SO_BINDTODEVICE stores ax25->ax25_dev without a reference while ax25_release() drops one, so a single setsockopt+close deterministically drives the refcount to zero and kfree()s the object still published in dev->ax25_ptr. The pure device-down race variant is also attacker-driven by spinning setsockopt/connect in a loop.\nPR:L - ax25_create() imposes no capability check for SOCK_DGRAM/SOCK_SEQPACKET, and the AF_AX25 module autoloads via the net-pf-3 alias, so any unprivileged local user in the init namespace can reach every vulnerable path. Root is only needed for the one-time deployment setup of the AX.25 port, not by the attacker.\nUI:N - The entire sequence is performed by the attacker's own process through socket(), setsockopt(), connect()/sendmsg() and close(); no victim action is involved.\nS:U - The freed ax25_dev and the corrupted kernel heap are entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - After the free, ax25_fillin_cb() copies bytes from the reclaimed slab object into the socket's t1/t2/t3/n2/paclen/window/backoff fields, which userspace reads back with getsockopt() — a direct kernel heap disclosure — and the general UAF read of ax25_dev->dev/->forward enables broader information leakage.\nI:H - The dangling pointer yields repeated refcount_dec() and stores to ax25_dev->forward and ->device_up into memory that has been reallocated for other kernel objects, giving a controlled decrement/write primitive on a groomed heap that is exploitable for privilege escalation.\nA:H - Dereferencing and freeing the already-freed ax25_dev reliably produces a kernel oops/panic (and netdev refcount underflow), and the same commit fixes a genuine sk_lock-AF_AX25 versus rtnl_mutex ABBA deadlock that permanently wedges the rtnl mutex and with it the entire networking stack."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/netdevice.h",
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"include/net/ax25.h",
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"net/ax25/af_ax25.c",
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"net/ax25/ax25_dev.c",
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"net/ax25/ax25_ip.c",
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"net/ax25/ax25_out.c",
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"net/ax25/ax25_route.c"
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],
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"versions": [
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{
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"version": "c433570458e49bccea5c551df628d058b3526289",
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"lessThan": "2802ed4ced27ebd474828fc67ffd7d66f11e3605",
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"status": "affected",
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{
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"version": "c39b8fd4997bf99503b8e48d8cb0eedb1d9a54f0",
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},
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{
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{
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"version": "77768c96dcf860c43b970b87b2a09229f84ea560",
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"status": "affected",
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},
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{
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"status": "affected",
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},
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{
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},
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{
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"version": "4.9.149",
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"status": "affected",
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},
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{
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"status": "affected",
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},
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{
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},
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{
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{
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"product": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/netdevice.h",
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"include/net/ax25.h",
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"net/ax25/af_ax25.c",
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"net/ax25/ax25_dev.c",
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"net/ax25/ax25_ip.c",
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"net/ax25/ax25_out.c",
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"net/ax25/ax25_route.c"
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],
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"versions": [
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{
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{
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"status": "unaffected",
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},
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{
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"version": "6.1.129",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.76",
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"status": "unaffected",
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},
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{
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"version": "6.12.13",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.13.2",
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"lessThanOrEqual": "6.13.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"operator": "OR",
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},
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},
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{
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2802ed4ced27ebd474828fc67ffd7d66f11e3605"
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},
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{
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"url": "https://git.kernel.org/stable/c/7705d8a7f2c26c80973c81093db07c6022b2b30e"
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},
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{
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"url": "https://git.kernel.org/stable/c/8937f5e38a218531dce2a89fae60e3adcc2311e1"
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{
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"url": "https://git.kernel.org/stable/c/c2531db6de3c95551be58878f859c6a053b7eb2e"
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{
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"url": "https://git.kernel.org/stable/c/95fc45d1dea8e1253f8ec58abc5befb71553d666"
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}
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],
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"title": "ax25: rcu protect dev->ax25_ptr",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
|
|
"scope": "UNCHANGED",
|
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"version": "3.1",
|
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"baseScore": 7.8,
|
|
"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21812",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-03-04T18:00:00.916644Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
|
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"lang": "en",
|
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"type": "CWE",
|
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"cweId": "CWE-416",
|
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
|
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2025-03-04T18:07:17.248Z"
|
|
}
|
|
},
|
|
{
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2025-11-03T20:59:48.635Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |