CVE-2026-53223
net: guard timestamp cmsgs to real error queue skbs
Description
In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.
INFO
Published Date :
June 25, 2026, 9:16 a.m.
Last Modified :
July 2, 2026, 8:47 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest version.
- Apply the provided patch for net: guard timestamp cmsgs.
- Verify correct skb ownership and destuctor.
- Test packet handling and timestamping functionality.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53223.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53223 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53223
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53223 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53223 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:4.11:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.11:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.11:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.11:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.11:rc8:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.11:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10.14 up to (excluding) 4.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.11.1 up to (excluding) 5.10.259 Added Reference Type kernel.org: https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': '24a0d548d3a765cd4558224e4f8e06e14cba26e3', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': '71ff5cdd5da61d0438e902aa0fd68c28bc901abe', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': 'ad9a0374ee6d11048e1f74cd5180bad58b9848b4', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': 'b903e9b5629ec8dd6db92174070045bf81ad7060', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': 'e0665b2a8e90bb08bd205062c75662b502d31797', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': '3dde4fb941fa5649ab809f6cd3e20e0c424a4e31', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': 'eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a', 'versionType': 'git'}, {'status': 'affected', 'version': '8605330aac5a5785630aec8f64378a54891937cc', 'lessThan': '1ee90b77b727df903033db873c75caac5c27ec98', 'versionType': 'git'}, {'status': 'affected', 'version': 'cdaf15b43bd31003220cb080bcbbd57787a2fca9', 'versionType': 'git'}, {'status': 'affected', 'version': '4.10.14', 'lessThan': '4.11', 'versionType': 'semver'}], 'programFiles': ['include/net/sock.h', 'net/core/skbuff.c', 'net/socket.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/net/sock.h', 'net/core/skbuff.c', 'net/socket.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership. Added Reference https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98 Added Reference https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3 Added Reference https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31 Added Reference https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe Added Reference https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4 Added Reference https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060 Added Reference https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797 Added Reference https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a