Not yet scoredPublished Dec 8, 2025

CVE-2023-53825kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg().

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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In the Linux kernel, the following vulnerability has been resolved: kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). syzkaller found a memory leak in kcm_sendmsg(), and commit c821a88bd720 ("kcm: Fix memory leak in error path of kcm_sendmsg()") suppressed it by updating kcm_tx_msg(head)->last_skb if partial data is copied so that the following sendmsg() will resume from the skb. However, we cannot know how many bytes were copied when we get the error. Thus, we could mess up the MSG_MORE queue. When kcm_sendmsg() fails for SOCK_DGRAM, we should purge the queue as we do so for UDP by udp_flush_pending_frames(). Even without this change, when the error occurred, the following sendmsg() resumed from a wrong skb and the queue was messed up. However, we have yet to get such a report, and only syzkaller stumbled on it. So, this can be changed safely. Note this does not change SOCK_SEQPACKET behaviour.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before 21b467735b0888a8daa048f83d3b9b50fdab71ce; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before d4b8f380b0a041ee6a84fdac14127d8fe1dcad7b; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before 1ce8362b4ac6b8e65fd04a22ea37ec776ee1ec5b; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before 2e18493c421428a936946c452461b8e979088f17; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before 55d2e7c1ab8eaa7b62575b8a4194132795d1f9fc; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before e5b28ce127a690f3acc49a6a342e6c9442c9edd6; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before 992b2ac783aad360b98ed9d4686e86176a20f6f1; from ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 before a22730b1b4bf437c6bbfdeff5feddf54be4aeada	CNA record

References

References

https://git.kernel.org/stable/c/21b467735b0888a8daa048f83d3b9b50fdab71ce
https://git.kernel.org/stable/c/d4b8f380b0a041ee6a84fdac14127d8fe1dcad7b
https://git.kernel.org/stable/c/1ce8362b4ac6b8e65fd04a22ea37ec776ee1ec5b
https://git.kernel.org/stable/c/2e18493c421428a936946c452461b8e979088f17
https://git.kernel.org/stable/c/55d2e7c1ab8eaa7b62575b8a4194132795d1f9fc
https://git.kernel.org/stable/c/e5b28ce127a690f3acc49a6a342e6c9442c9edd6
https://git.kernel.org/stable/c/992b2ac783aad360b98ed9d4686e86176a20f6f1
https://git.kernel.org/stable/c/a22730b1b4bf437c6bbfdeff5feddf54be4aeada

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.