CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6345 vulnerabilities reference this CWE, most recent first.
GHSA-6743-FX46-J8W6
Vulnerability from github – Published: 2022-05-24 17:20 – Updated: 2022-05-24 17:20An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0. janus_sdp_preparse in sdp.c has a NULL pointer dereference.
{
"affected": [],
"aliases": [
"CVE-2020-13900"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-06-10T22:15:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0. janus_sdp_preparse in sdp.c has a NULL pointer dereference.",
"id": "GHSA-6743-fx46-j8w6",
"modified": "2022-05-24T17:20:22Z",
"published": "2022-05-24T17:20:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-13900"
},
{
"type": "WEB",
"url": "https://github.com/meetecho/janus-gateway/pull/2214"
},
{
"type": "WEB",
"url": "https://github.com/meetecho/janus-gateway/blob/v0.10.0/sdp.c#L64"
},
{
"type": "WEB",
"url": "https://github.com/meetecho/janus-gateway/blob/v0.10.0/sdp.c#L74"
},
{
"type": "WEB",
"url": "https://github.com/merrychap/CVEs/tree/master/CVE-2020-13900"
},
{
"type": "WEB",
"url": "https://github.com/merrychap/poc_exploits/tree/master/janus-webrtc/CVE-2020-13900"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-674V-8JWC-QM6F
Vulnerability from github – Published: 2022-05-17 02:51 – Updated: 2022-05-17 02:51ImageMagick allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted ps file.
{
"affected": [],
"aliases": [
"CVE-2014-9812"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-03-30T15:59:00Z",
"severity": "MODERATE"
},
"details": "ImageMagick allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted ps file.",
"id": "GHSA-674v-8jwc-qm6f",
"modified": "2022-05-17T02:51:57Z",
"published": "2022-05-17T02:51:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2014-9812"
},
{
"type": "WEB",
"url": "https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream\u0026id=f093a3119704fd6d349a9ee32b9f71cabe7d04c8"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1343468"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2014/12/24/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2016/06/02/13"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-675J-298R-VV37
Vulnerability from github – Published: 2024-05-01 15:30 – Updated: 2026-05-12 12:31In the Linux kernel, the following vulnerability has been resolved:
wifi: wilc1000: fix RCU usage in connect path
With lockdep enabled, calls to the connect function from cfg802.11 layer lead to the following warning:
============================= WARNING: suspicious RCU usage 6.7.0-rc1-wt+ #333 Not tainted
drivers/net/wireless/microchip/wilc1000/hif.c:386 suspicious rcu_dereference_check() usage! [...] stack backtrace: CPU: 0 PID: 100 Comm: wpa_supplicant Not tainted 6.7.0-rc1-wt+ #333 Hardware name: Atmel SAMA5 unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x34/0x48 dump_stack_lvl from wilc_parse_join_bss_param+0x7dc/0x7f4 wilc_parse_join_bss_param from connect+0x2c4/0x648 connect from cfg80211_connect+0x30c/0xb74 cfg80211_connect from nl80211_connect+0x860/0xa94 nl80211_connect from genl_rcv_msg+0x3fc/0x59c genl_rcv_msg from netlink_rcv_skb+0xd0/0x1f8 netlink_rcv_skb from genl_rcv+0x2c/0x3c genl_rcv from netlink_unicast+0x3b0/0x550 netlink_unicast from netlink_sendmsg+0x368/0x688 netlink_sendmsg from _syssendmsg+0x190/0x430 __sys_sendmsg from syssendmsg+0x110/0x158 _sys_sendmsg from sys_sendmsg+0xe8/0x150 sys_sendmsg from ret_fast_syscall+0x0/0x1c
This warning is emitted because in the connect path, when trying to parse target BSS parameters, we dereference a RCU pointer whithout being in RCU critical section. Fix RCU dereference usage by moving it to a RCU read critical section. To avoid wrapping the whole wilc_parse_join_bss_param under the critical section, just use the critical section to copy ies data
{
"affected": [],
"aliases": [
"CVE-2024-27053"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-01T13:15:50Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wilc1000: fix RCU usage in connect path\n\nWith lockdep enabled, calls to the connect function from cfg802.11 layer\nlead to the following warning:\n\n=============================\nWARNING: suspicious RCU usage\n6.7.0-rc1-wt+ #333 Not tainted\n-----------------------------\ndrivers/net/wireless/microchip/wilc1000/hif.c:386\nsuspicious rcu_dereference_check() usage!\n[...]\nstack backtrace:\nCPU: 0 PID: 100 Comm: wpa_supplicant Not tainted 6.7.0-rc1-wt+ #333\nHardware name: Atmel SAMA5\n unwind_backtrace from show_stack+0x18/0x1c\n show_stack from dump_stack_lvl+0x34/0x48\n dump_stack_lvl from wilc_parse_join_bss_param+0x7dc/0x7f4\n wilc_parse_join_bss_param from connect+0x2c4/0x648\n connect from cfg80211_connect+0x30c/0xb74\n cfg80211_connect from nl80211_connect+0x860/0xa94\n nl80211_connect from genl_rcv_msg+0x3fc/0x59c\n genl_rcv_msg from netlink_rcv_skb+0xd0/0x1f8\n netlink_rcv_skb from genl_rcv+0x2c/0x3c\n genl_rcv from netlink_unicast+0x3b0/0x550\n netlink_unicast from netlink_sendmsg+0x368/0x688\n netlink_sendmsg from ____sys_sendmsg+0x190/0x430\n ____sys_sendmsg from ___sys_sendmsg+0x110/0x158\n ___sys_sendmsg from sys_sendmsg+0xe8/0x150\n sys_sendmsg from ret_fast_syscall+0x0/0x1c\n\nThis warning is emitted because in the connect path, when trying to parse\ntarget BSS parameters, we dereference a RCU pointer whithout being in RCU\ncritical section.\nFix RCU dereference usage by moving it to a RCU read critical section. To\navoid wrapping the whole wilc_parse_join_bss_param under the critical\nsection, just use the critical section to copy ies data",
"id": "GHSA-675j-298r-vv37",
"modified": "2026-05-12T12:31:44Z",
"published": "2024-05-01T15:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27053"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/205c50306acf58a335eb19fa84e40140f4fe814f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4bfd20d5f5c62b5495d6c0016ee6933bd3add7ce"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5800ec78775c0cd646f71eb9bf8402fb794807de"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/745003b5917b610352f52fe0d11ef658d6471ec2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b4bbf38c350acb6500cbe667b1e2e68f896e4b38"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d80fc436751cfa6b02a8eda74eb6cce7dadfe5a2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dd50d3ead6e3707bb0a5df7cc832730c93ace3a7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e556006de4ea93abe2b46cba202a2556c544b8b2"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6779-G665-3PPQ
Vulnerability from github – Published: 2022-05-17 02:36 – Updated: 2022-05-17 02:36An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. w3m allows remote attackers to cause a denial of service (segmentation fault and crash) via a crafted HTML page.
{
"affected": [],
"aliases": [
"CVE-2016-9434"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2016-12-12T02:59:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. w3m allows remote attackers to cause a denial of service (segmentation fault and crash) via a crafted HTML page.",
"id": "GHSA-6779-g665-3ppq",
"modified": "2022-05-17T02:36:43Z",
"published": "2022-05-17T02:36:43Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2016-9434"
},
{
"type": "WEB",
"url": "https://github.com/tats/w3m/issues/15"
},
{
"type": "WEB",
"url": "https://github.com/tats/w3m/blob/master/ChangeLog"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/201701-08"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2016/11/18/3"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/94407"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6779-V6GP-JMXV
Vulnerability from github – Published: 2024-12-28 12:30 – Updated: 2025-01-08 18:30In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps_info()
Fix two issues with memory allocation in amdgpu_discovery_get_nps_info() for mem_ranges:
-
Add a check for allocation failure to avoid dereferencing a null pointer.
-
As suggested by Christophe, use kvcalloc() for memory allocation, which checks for multiplication overflow.
Additionally, assign the output parameters nps_type and range_cnt after the kvcalloc() call to prevent modifying the output parameters in case of an error return.
{
"affected": [],
"aliases": [
"CVE-2024-56697"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-12-28T10:15:16Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps_info()\n\nFix two issues with memory allocation in amdgpu_discovery_get_nps_info()\nfor mem_ranges:\n\n - Add a check for allocation failure to avoid dereferencing a null\n pointer.\n\n - As suggested by Christophe, use kvcalloc() for memory allocation,\n which checks for multiplication overflow.\n\nAdditionally, assign the output parameters nps_type and range_cnt after\nthe kvcalloc() call to prevent modifying the output parameters in case\nof an error return.",
"id": "GHSA-6779-v6gp-jmxv",
"modified": "2025-01-08T18:30:48Z",
"published": "2024-12-28T12:30:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56697"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a1144da794adedb9447437c57d69add56494309d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d14bea4e094871226ea69772d69dab8b7b5f4915"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e8f1dbaa0437eba4e8c1d6a6d81eca2e2ce3d197"
}
],
"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-677C-PQCW-QH84
Vulnerability from github – Published: 2024-06-19 15:30 – Updated: 2024-11-01 15:31In the Linux kernel, the following vulnerability has been resolved:
mptcp: clear 'kern' flag from fallback sockets
The mptcp ULP extension relies on sk->sk_sock_kern being set correctly: It prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); from working for plain tcp sockets (any userspace-exposed socket).
But in case of fallback, accept() can return a plain tcp sk. In such case, sk is still tagged as 'kernel' and setsockopt will work.
This will crash the kernel, The subflow extension has a NULL ctx->conn mptcp socket:
BUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0 Call Trace: tcp_data_ready+0xf8/0x370 [..]
{
"affected": [],
"aliases": [
"CVE-2021-47593"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-06-19T15:15:53Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: clear \u0027kern\u0027 flag from fallback sockets\n\nThe mptcp ULP extension relies on sk-\u003esk_sock_kern being set correctly:\nIt prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, \"mptcp\", 6); from\nworking for plain tcp sockets (any userspace-exposed socket).\n\nBut in case of fallback, accept() can return a plain tcp sk.\nIn such case, sk is still tagged as \u0027kernel\u0027 and setsockopt will work.\n\nThis will crash the kernel, The subflow extension has a NULL ctx-\u003econn\nmptcp socket:\n\nBUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0\nCall Trace:\n tcp_data_ready+0xf8/0x370\n [..]",
"id": "GHSA-677c-pqcw-qh84",
"modified": "2024-11-01T15:31:45Z",
"published": "2024-06-19T15:30:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47593"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/451f1eded7f56e93aaf52eb547ba97742d9c0e97"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c26ac0ea3a91c210cf90452e625dc441adf3e549"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d6692b3b97bdc165d150f4c1505751a323a80717"
}
],
"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-677F-C75X-79M2
Vulnerability from github – Published: 2025-05-26 15:30 – Updated: 2025-12-16 21:30In the Linux kernel, the following vulnerability has been resolved:
net_sched: Flush gso_skb list too during ->change()
Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen.
This patch introduces a new helper, qdisc_dequeue_internal(), which ensures both the gso_skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.
{
"affected": [],
"aliases": [
"CVE-2025-37992"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-26T15:15:19Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: Flush gso_skb list too during -\u003echange()\n\nPreviously, when reducing a qdisc\u0027s limit via the -\u003echange() operation, only\nthe main skb queue was trimmed, potentially leaving packets in the gso_skb\nlist. This could result in NULL pointer dereference when we only check\nsch-\u003elimit against sch-\u003eq.qlen.\n\nThis patch introduces a new helper, qdisc_dequeue_internal(), which ensures\nboth the gso_skb list and the main queue are properly flushed when trimming\nexcess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie)\nare updated to use this helper in their -\u003echange() routines.",
"id": "GHSA-677f-c75x-79m2",
"modified": "2025-12-16T21:30:49Z",
"published": "2025-05-26T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37992"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.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"
}
]
}
GHSA-677F-PP67-87JC
Vulnerability from github – Published: 2022-05-13 01:11 – Updated: 2025-04-11 04:07The pkinit_server_return_padata function in plugins/preauth/pkinit/pkinit_srv.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 attempts to find an agility KDF identifier in inappropriate circumstances, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted Draft 9 request.
{
"affected": [],
"aliases": [
"CVE-2012-1016"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2013-03-05T04:54:00Z",
"severity": "MODERATE"
},
"details": "The pkinit_server_return_padata function in plugins/preauth/pkinit/pkinit_srv.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 attempts to find an agility KDF identifier in inappropriate circumstances, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted Draft 9 request.",
"id": "GHSA-677f-pp67-87jc",
"modified": "2025-04-11T04:07:58Z",
"published": "2022-05-13T01:11:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2012-1016"
},
{
"type": "WEB",
"url": "https://github.com/krb5/krb5/commit/db64ca25d661a47b996b4e2645998b5d7f0eb52c"
},
{
"type": "WEB",
"url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=7527"
},
{
"type": "WEB",
"url": "http://secunia.com/advisories/55040"
},
{
"type": "WEB",
"url": "http://web.mit.edu/kerberos/www/krb5-1.10"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-6782-3G9Q-CMG4
Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-15 18:30In the Linux kernel, the following vulnerability has been resolved:
drm/amd: Fix a few more NULL pointer dereference in device cleanup
I found a few more paths that cleanup fails due to a NULL version pointer on unsupported hardware.
Add NULL checks as applicable.
(cherry picked from commit f5a05f8414fc10f307eb965f303580c7778f8dd2)
{
"affected": [],
"aliases": [
"CVE-2026-43367"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-08T15:16:47Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd: Fix a few more NULL pointer dereference in device cleanup\n\nI found a few more paths that cleanup fails due to a NULL version pointer\non unsupported hardware.\n\nAdd NULL checks as applicable.\n\n(cherry picked from commit f5a05f8414fc10f307eb965f303580c7778f8dd2)",
"id": "GHSA-6782-3g9q-cmg4",
"modified": "2026-05-15T18:30:30Z",
"published": "2026-05-08T15:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43367"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38f1640db7f8bf57b9e09c5b0b8b205a598f1b3e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5edcb0d6729b88f192ec8b0896aaf581e3593c9c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/72ecb1dae72775fa9fea0159d8445d620a0a2295"
}
],
"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-67C3-X939-573C
Vulnerability from github – Published: 2025-09-18 15:30 – Updated: 2025-12-11 21:31In the Linux kernel, the following vulnerability has been resolved:
mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()
KCSAN found an issue in obj_stock_flush_required(): stock->cached_objcg can be reset between the check and dereference:
================================================================== BUG: KCSAN: data-race in drain_all_stock / drain_obj_stock
write to 0xffff888237c2a2f8 of 8 bytes by task 19625 on cpu 0: drain_obj_stock+0x408/0x4e0 mm/memcontrol.c:3306 refill_obj_stock+0x9c/0x1e0 mm/memcontrol.c:3340 obj_cgroup_uncharge+0xe/0x10 mm/memcontrol.c:3408 memcg_slab_free_hook mm/slab.h:587 [inline] __cache_free mm/slab.c:3373 [inline] __do_kmem_cache_free mm/slab.c:3577 [inline] kmem_cache_free+0x105/0x280 mm/slab.c:3602 __d_free fs/dcache.c:298 [inline] dentry_free fs/dcache.c:375 [inline] __dentry_kill+0x422/0x4a0 fs/dcache.c:621 dentry_kill+0x8d/0x1e0 dput+0x118/0x1f0 fs/dcache.c:913 __fput+0x3bf/0x570 fs/file_table.c:329 _fput+0x15/0x20 fs/filetable.c:349 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd
read to 0xffff888237c2a2f8 of 8 bytes by task 19632 on cpu 1: obj_stock_flush_required mm/memcontrol.c:3319 [inline] drain_all_stock+0x174/0x2a0 mm/memcontrol.c:2361 try_charge_memcg+0x6d0/0xd10 mm/memcontrol.c:2703 try_charge mm/memcontrol.c:2837 [inline] mem_cgroup_charge_skmem+0x51/0x140 mm/memcontrol.c:7290 sock_reserve_memory+0xb1/0x390 net/core/sock.c:1025 sk_setsockopt+0x800/0x1e70 net/core/sock.c:1525 udp_lib_setsockopt+0x99/0x6c0 net/ipv4/udp.c:2692 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2817 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3668 __sys_setsockopt+0x1c3/0x230 net/socket.c:2271 __do_sys_setsockopt net/socket.c:2282 [inline] __se_sys_setsockopt net/socket.c:2279 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2279 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd
value changed: 0xffff8881382d52c0 -> 0xffff888138893740
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19632 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00387-g534293368afa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Fix it by using READ_ONCE()/WRITE_ONCE() for all accesses to stock->cached_objcg.
{
"affected": [],
"aliases": [
"CVE-2023-53401"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-18T14:15:43Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()\n\nKCSAN found an issue in obj_stock_flush_required():\nstock-\u003ecached_objcg can be reset between the check and dereference:\n\n==================================================================\nBUG: KCSAN: data-race in drain_all_stock / drain_obj_stock\n\nwrite to 0xffff888237c2a2f8 of 8 bytes by task 19625 on cpu 0:\n drain_obj_stock+0x408/0x4e0 mm/memcontrol.c:3306\n refill_obj_stock+0x9c/0x1e0 mm/memcontrol.c:3340\n obj_cgroup_uncharge+0xe/0x10 mm/memcontrol.c:3408\n memcg_slab_free_hook mm/slab.h:587 [inline]\n __cache_free mm/slab.c:3373 [inline]\n __do_kmem_cache_free mm/slab.c:3577 [inline]\n kmem_cache_free+0x105/0x280 mm/slab.c:3602\n __d_free fs/dcache.c:298 [inline]\n dentry_free fs/dcache.c:375 [inline]\n __dentry_kill+0x422/0x4a0 fs/dcache.c:621\n dentry_kill+0x8d/0x1e0\n dput+0x118/0x1f0 fs/dcache.c:913\n __fput+0x3bf/0x570 fs/file_table.c:329\n ____fput+0x15/0x20 fs/file_table.c:349\n task_work_run+0x123/0x160 kernel/task_work.c:179\n resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]\n exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171\n exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296\n do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nread to 0xffff888237c2a2f8 of 8 bytes by task 19632 on cpu 1:\n obj_stock_flush_required mm/memcontrol.c:3319 [inline]\n drain_all_stock+0x174/0x2a0 mm/memcontrol.c:2361\n try_charge_memcg+0x6d0/0xd10 mm/memcontrol.c:2703\n try_charge mm/memcontrol.c:2837 [inline]\n mem_cgroup_charge_skmem+0x51/0x140 mm/memcontrol.c:7290\n sock_reserve_memory+0xb1/0x390 net/core/sock.c:1025\n sk_setsockopt+0x800/0x1e70 net/core/sock.c:1525\n udp_lib_setsockopt+0x99/0x6c0 net/ipv4/udp.c:2692\n udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2817\n sock_common_setsockopt+0x61/0x70 net/core/sock.c:3668\n __sys_setsockopt+0x1c3/0x230 net/socket.c:2271\n __do_sys_setsockopt net/socket.c:2282 [inline]\n __se_sys_setsockopt net/socket.c:2279 [inline]\n __x64_sys_setsockopt+0x66/0x80 net/socket.c:2279\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nvalue changed: 0xffff8881382d52c0 -\u003e 0xffff888138893740\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 19632 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00387-g534293368afa #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023\n\nFix it by using READ_ONCE()/WRITE_ONCE() for all accesses to\nstock-\u003ecached_objcg.",
"id": "GHSA-67c3-x939-573c",
"modified": "2025-12-11T21:31:26Z",
"published": "2025-09-18T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53401"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/33391c7e1a2ad612bf3922cc168cb09a46bbe236"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/33d9490b27e5d8da4444aefd714a4f50189db978"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3b8abb3239530c423c0b97e42af7f7e856e1ee96"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-56
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Select a programming language that is not susceptible to these issues.
Mitigation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Mitigation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
No CAPEC attack patterns related to this CWE.