CWE-416
AllowedUse After Free
Abstraction: Variant · Status: Stable
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
10208 vulnerabilities reference this CWE, most recent first.
GHSA-H762-GWWM-V9VJ
Vulnerability from github – Published: 2025-08-24 12:31 – Updated: 2025-08-24 12:31A flaw has been found in appneta tcpreplay up to 4.5.1. The affected element is the function fix_ipv6_checksums of the file edit_packet.c of the component tcprewrite. This manipulation causes use after free. The attack is restricted to local execution. The exploit has been published and may be used. Upgrading to version 4.5.2-beta3 is sufficient to fix this issue. It is advisable to upgrade the affected component.
{
"affected": [],
"aliases": [
"CVE-2025-9385"
],
"database_specific": {
"cwe_ids": [
"CWE-119",
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-24T11:15:33Z",
"severity": "MODERATE"
},
"details": "A flaw has been found in appneta tcpreplay up to 4.5.1. The affected element is the function fix_ipv6_checksums of the file edit_packet.c of the component tcprewrite. This manipulation causes use after free. The attack is restricted to local execution. The exploit has been published and may be used. Upgrading to version 4.5.2-beta3 is sufficient to fix this issue. It is advisable to upgrade the affected component.",
"id": "GHSA-h762-gwwm-v9vj",
"modified": "2025-08-24T12:31:34Z",
"published": "2025-08-24T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-9385"
},
{
"type": "WEB",
"url": "https://github.com/appneta/tcpreplay/issues/972"
},
{
"type": "WEB",
"url": "https://github.com/appneta/tcpreplay/issues/972#issuecomment-3199019278"
},
{
"type": "WEB",
"url": "https://drive.google.com/file/d/1BQZF558bRHv07wtlCoZgtqTlEpHgfytp/view?usp=sharing"
},
{
"type": "WEB",
"url": "https://vuldb.com/?ctiid.321218"
},
{
"type": "WEB",
"url": "https://vuldb.com/?id.321218"
},
{
"type": "WEB",
"url": "https://vuldb.com/?submit.630497"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-H76P-MPRH-FVMV
Vulnerability from github – Published: 2024-01-11 21:31 – Updated: 2024-04-19 09:30An issue was discovered in the Linux kernel before 6.6.8. do_vcc_ioctl in net/atm/ioctl.c has a use-after-free because of a vcc_recvmsg race condition.
{
"affected": [],
"aliases": [
"CVE-2023-51780"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-11T19:15:12Z",
"severity": "HIGH"
},
"details": "An issue was discovered in the Linux kernel before 6.6.8. do_vcc_ioctl in net/atm/ioctl.c has a use-after-free because of a vcc_recvmsg race condition.",
"id": "GHSA-h76p-mprh-fvmv",
"modified": "2024-04-19T09:30:46Z",
"published": "2024-01-11T21:31:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-51780"
},
{
"type": "WEB",
"url": "https://github.com/torvalds/linux/commit/24e90b9e34f9e039f56b5f25f6e6eb92cdd8f4b3"
},
{
"type": "WEB",
"url": "https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.8"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20240419-0001"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H78P-V7HC-728F
Vulnerability from github – Published: 2024-02-28 09:30 – Updated: 2024-12-31 18:30In the Linux kernel, the following vulnerability has been resolved:
usb: dwc3: gadget: Free gadget structure only after freeing endpoints
As part of commit e81a7018d93a ("usb: dwc3: allocate gadget structure dynamically") the dwc3_gadget_release() was added which will free the dwc->gadget structure upon the device's removal when usb_del_gadget_udc() is called in dwc3_gadget_exit().
However, simply freeing the gadget results a dangling pointer situation: the endpoints created in dwc3_gadget_init_endpoints() have their dep->endpoint.ep_list members chained off the list_head anchored at dwc->gadget->ep_list. Thus when dwc->gadget is freed, the first dwc3_ep in the list now has a dangling prev pointer and likewise for the next pointer of the dwc3_ep at the tail of the list. The dwc3_gadget_free_endpoints() that follows will result in a use-after-free when it calls list_del().
This was caught by enabling KASAN and performing a driver unbind. The recent commit 568262bf5492 ("usb: dwc3: core: Add shutdown callback for dwc3") also exposes this as a panic during shutdown.
There are a few possibilities to fix this. One could be to perform a list_del() of the gadget->ep_list itself which removes it from the rest of the dwc3_ep chain.
Another approach is what this patch does, by splitting up the usb_del_gadget_udc() call into its separate "del" and "put" components. This allows dwc3_gadget_free_endpoints() to be called before the gadget is finally freed with usb_put_gadget().
{
"affected": [],
"aliases": [
"CVE-2021-46986"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-28T09:15:37Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: Free gadget structure only after freeing endpoints\n\nAs part of commit e81a7018d93a (\"usb: dwc3: allocate gadget structure\ndynamically\") the dwc3_gadget_release() was added which will free\nthe dwc-\u003egadget structure upon the device\u0027s removal when\nusb_del_gadget_udc() is called in dwc3_gadget_exit().\n\nHowever, simply freeing the gadget results a dangling pointer\nsituation: the endpoints created in dwc3_gadget_init_endpoints()\nhave their dep-\u003eendpoint.ep_list members chained off the list_head\nanchored at dwc-\u003egadget-\u003eep_list. Thus when dwc-\u003egadget is freed,\nthe first dwc3_ep in the list now has a dangling prev pointer and\nlikewise for the next pointer of the dwc3_ep at the tail of the list.\nThe dwc3_gadget_free_endpoints() that follows will result in a\nuse-after-free when it calls list_del().\n\nThis was caught by enabling KASAN and performing a driver unbind.\nThe recent commit 568262bf5492 (\"usb: dwc3: core: Add shutdown\ncallback for dwc3\") also exposes this as a panic during shutdown.\n\nThere are a few possibilities to fix this. One could be to perform\na list_del() of the gadget-\u003eep_list itself which removes it from\nthe rest of the dwc3_ep chain.\n\nAnother approach is what this patch does, by splitting up the\nusb_del_gadget_udc() call into its separate \"del\" and \"put\"\ncomponents. This allows dwc3_gadget_free_endpoints() to be\ncalled before the gadget is finally freed with usb_put_gadget().",
"id": "GHSA-h78p-v7hc-728f",
"modified": "2024-12-31T18:30:50Z",
"published": "2024-02-28T09:30:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46986"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H79P-MFPR-8QM4
Vulnerability from github – Published: 2026-02-24 15:30 – Updated: 2026-02-25 15:31Use-after-free in the Graphics: ImageLib component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8.
{
"affected": [],
"aliases": [
"CVE-2026-2789"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-24T14:16:27Z",
"severity": "CRITICAL"
},
"details": "Use-after-free in the Graphics: ImageLib component. This vulnerability affects Firefox \u003c 148, Firefox ESR \u003c 115.33, and Firefox ESR \u003c 140.8.",
"id": "GHSA-h79p-mfpr-8qm4",
"modified": "2026-02-25T15:31:37Z",
"published": "2026-02-24T15:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2789"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2015179"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-13"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-14"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-15"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-16"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-17"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7C6-V859-VR9J
Vulnerability from github – Published: 2024-12-02 12:38 – Updated: 2024-12-02 12:38Memory corruption when multiple threads try to unregister the CVP buffer at the same time.
{
"affected": [],
"aliases": [
"CVE-2024-33053"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-12-02T11:15:08Z",
"severity": "MODERATE"
},
"details": "Memory corruption when multiple threads try to unregister the CVP buffer at the same time.",
"id": "GHSA-h7c6-v859-vr9j",
"modified": "2024-12-02T12:38:27Z",
"published": "2024-12-02T12:38:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-33053"
},
{
"type": "WEB",
"url": "https://docs.qualcomm.com/product/publicresources/securitybulletin/december-2024-bulletin.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7C8-WRGV-C7F2
Vulnerability from github – Published: 2026-07-19 12:30 – Updated: 2026-07-29 21:30In the Linux kernel, the following vulnerability has been resolved:
gfs2: fix use-after-free in gfs2_qd_dealloc
gfs2_qd_dealloc(), called as an RCU callback from gfs2_qd_dispose(), accesses the superblock object sdp through qd->qd_sbd after freeing qd. It does so to decrement sd_quota_count and wake up sd_kill_wait.
However, by the time the RCU callback runs, gfs2_put_super() may have already freed sdp via free_sbd(). This can happen when gfs2_quota_cleanup() is called during unmount: it disposes of quota objects via call_rcu() and then waits on sd_kill_wait with a 60-second timeout. If the timeout expires, or if gfs2_gl_hash_clear() triggers additional qd_put() calls that schedule more RCU callbacks after the wait completes, gfs2_put_super() will proceed to free the superblock while RCU callbacks referencing it are still pending.
Add an rcu_barrier() before free_sbd() in gfs2_put_super() to ensure all pending RCU callbacks (including gfs2_qd_dealloc) have completed before the superblock is freed.
{
"affected": [],
"aliases": [
"CVE-2026-63804"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-19T12:16:53Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: fix use-after-free in gfs2_qd_dealloc\n\ngfs2_qd_dealloc(), called as an RCU callback from gfs2_qd_dispose(),\naccesses the superblock object sdp through qd-\u003eqd_sbd after freeing qd.\nIt does so to decrement sd_quota_count and wake up sd_kill_wait.\n\nHowever, by the time the RCU callback runs, gfs2_put_super() may have\nalready freed sdp via free_sbd(). This can happen when\ngfs2_quota_cleanup() is called during unmount: it disposes of quota\nobjects via call_rcu() and then waits on sd_kill_wait with a 60-second\ntimeout. If the timeout expires, or if gfs2_gl_hash_clear() triggers\nadditional qd_put() calls that schedule more RCU callbacks after the\nwait completes, gfs2_put_super() will proceed to free the superblock\nwhile RCU callbacks referencing it are still pending.\n\nAdd an rcu_barrier() before free_sbd() in gfs2_put_super() to ensure\nall pending RCU callbacks (including gfs2_qd_dealloc) have completed\nbefore the superblock is freed.",
"id": "GHSA-h7c8-wrgv-c7f2",
"modified": "2026-07-29T21:30:54Z",
"published": "2026-07-19T12:30:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63804"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4fe388218826df8607ae41a6305df67db08a9093"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8745d9f7e1682c39f0a1578895ac74205e2a6757"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d0d5ba20cad661f7f287d4c66d2c19022ce2fd0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b85ef03f726b15047a6fa6d11b639bdf6c0ee4f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9c9ec2c319f843b70ecdf939d48b52d189bc081"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7HQ-XFR6-P8J2
Vulnerability from github – Published: 2026-08-11 18:31 – Updated: 2026-08-11 18:31Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.
{
"affected": [],
"aliases": [
"CVE-2026-62711"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-11T17:18:21Z",
"severity": "HIGH"
},
"details": "Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.",
"id": "GHSA-h7hq-xfr6-p8j2",
"modified": "2026-08-11T18:31:14Z",
"published": "2026-08-11T18:31:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62711"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62711"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7J9-XX82-GQXR
Vulnerability from github – Published: 2022-05-24 19:02 – Updated: 2023-12-29 00:30Microsoft Office Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31175, CVE-2021-31176, CVE-2021-31179.
{
"affected": [],
"aliases": [
"CVE-2021-31177"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-05-11T19:15:00Z",
"severity": "HIGH"
},
"details": "Microsoft Office Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31175, CVE-2021-31176, CVE-2021-31179.",
"id": "GHSA-h7j9-xx82-gqxr",
"modified": "2023-12-29T00:30:26Z",
"published": "2022-05-24T19:02:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-31177"
},
{
"type": "WEB",
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31177"
},
{
"type": "WEB",
"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-576"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7JC-CC8W-WCWG
Vulnerability from github – Published: 2025-10-14 15:31 – Updated: 2025-11-03 18:31Use-after-free in MediaTrackGraphImpl::GetInstance() This vulnerability affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
{
"affected": [],
"aliases": [
"CVE-2025-11708"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-14T13:15:36Z",
"severity": "CRITICAL"
},
"details": "Use-after-free in MediaTrackGraphImpl::GetInstance() This vulnerability affects Firefox \u003c 144, Firefox ESR \u003c 140.4, Thunderbird \u003c 144, and Thunderbird \u003c 140.4.",
"id": "GHSA-h7jc-cc8w-wcwg",
"modified": "2025-11-03T18:31:46Z",
"published": "2025-10-14T15:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11708"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1988931"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2025-81"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2025-83"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2025-84"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2025-85"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-H7P9-F9R3-6533
Vulnerability from github – Published: 2024-10-21 18:30 – Updated: 2025-11-04 00:31In the Linux kernel, the following vulnerability has been resolved:
btrfs: wait for fixup workers before stopping cleaner kthread during umount
During unmount, at close_ctree(), we have the following steps in this order:
1) Park the cleaner kthread - this doesn't destroy the kthread, it basically halts its execution (wake ups against it work but do nothing);
2) We stop the cleaner kthread - this results in freeing the respective struct task_struct;
3) We call btrfs_stop_all_workers() which waits for any jobs running in all the work queues and then free the work queues.
Syzbot reported a case where a fixup worker resulted in a crash when doing a delayed iput on its inode while attempting to wake up the cleaner at btrfs_add_delayed_iput(), because the task_struct of the cleaner kthread was already freed. This can happen during unmount because we don't wait for any fixup workers still running before we call kthread_stop() against the cleaner kthread, which stops and free all its resources.
Fix this by waiting for any fixup workers at close_ctree() before we call kthread_stop() against the cleaner and run pending delayed iputs.
The stack traces reported by syzbot were the following:
BUG: KASAN: slab-use-after-free in __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065 Read of size 8 at addr ffff8880272a8a18 by task kworker/u8:3/52
CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btrfs-fixup btrfs_work_helper Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154 btrfs_writepage_fixup_worker+0xc16/0xdf0 fs/btrfs/inode.c:2842 btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Allocated by task 2: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4187 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2206 kernel_clone+0x223/0x880 kernel/fork.c:2787 kernel_thread+0x1bc/0x240 kernel/fork.c:2849 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:765 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Freed by task 61: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_h ---truncated---
{
"affected": [],
"aliases": [
"CVE-2024-49867"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-21T18:15:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: wait for fixup workers before stopping cleaner kthread during umount\n\nDuring unmount, at close_ctree(), we have the following steps in this order:\n\n1) Park the cleaner kthread - this doesn\u0027t destroy the kthread, it basically\n halts its execution (wake ups against it work but do nothing);\n\n2) We stop the cleaner kthread - this results in freeing the respective\n struct task_struct;\n\n3) We call btrfs_stop_all_workers() which waits for any jobs running in all\n the work queues and then free the work queues.\n\nSyzbot reported a case where a fixup worker resulted in a crash when doing\na delayed iput on its inode while attempting to wake up the cleaner at\nbtrfs_add_delayed_iput(), because the task_struct of the cleaner kthread\nwas already freed. This can happen during unmount because we don\u0027t wait\nfor any fixup workers still running before we call kthread_stop() against\nthe cleaner kthread, which stops and free all its resources.\n\nFix this by waiting for any fixup workers at close_ctree() before we call\nkthread_stop() against the cleaner and run pending delayed iputs.\n\nThe stack traces reported by syzbot were the following:\n\n BUG: KASAN: slab-use-after-free in __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065\n Read of size 8 at addr ffff8880272a8a18 by task kworker/u8:3/52\n\n CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.12.0-rc1-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n Workqueue: btrfs-fixup btrfs_work_helper\n Call Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162\n class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]\n try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154\n btrfs_writepage_fixup_worker+0xc16/0xdf0 fs/btrfs/inode.c:2842\n btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314\n process_one_work kernel/workqueue.c:3229 [inline]\n process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310\n worker_thread+0x870/0xd30 kernel/workqueue.c:3391\n kthread+0x2f0/0x390 kernel/kthread.c:389\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n \u003c/TASK\u003e\n\n Allocated by task 2:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:319 [inline]\n __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345\n kasan_slab_alloc include/linux/kasan.h:247 [inline]\n slab_post_alloc_hook mm/slub.c:4086 [inline]\n slab_alloc_node mm/slub.c:4135 [inline]\n kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4187\n alloc_task_struct_node kernel/fork.c:180 [inline]\n dup_task_struct+0x57/0x8c0 kernel/fork.c:1107\n copy_process+0x5d1/0x3d50 kernel/fork.c:2206\n kernel_clone+0x223/0x880 kernel/fork.c:2787\n kernel_thread+0x1bc/0x240 kernel/fork.c:2849\n create_kthread kernel/kthread.c:412 [inline]\n kthreadd+0x60d/0x810 kernel/kthread.c:765\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\n Freed by task 61:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:230 [inline]\n slab_free_h\n---truncated---",
"id": "GHSA-h7p9-f9r3-6533",
"modified": "2025-11-04T00:31:40Z",
"published": "2024-10-21T18:30:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49867"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/41fd1e94066a815a7ab0a7025359e9b40e4b3576"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4c98fe0dfa2ae83c4631699695506d8941db4bfe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/65d11eb276836d49003a8060cf31fa2284ad1047"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/70b60c8d9b42763d6629e44f448aa5d8ae477d61"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9da40aea63f8769f28afb91aea0fac4cf6fbbb65"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a71349b692ab34ea197949e13e3cc42570fe73d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bf0de0f9a0544c11f96f93206da04ab87dcea1f4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cd686dfff63f27d712877aef5b962fbf6b8bc264"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ed87190e9d9c80aad220fb6b0b03a84d22e2c95b"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation
Strategy: Language Selection
Choose a language that provides automatic memory management.
Mitigation
Strategy: Attack Surface Reduction
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
No CAPEC attack patterns related to this CWE.