CVE-2023-53825 (GCVE-0-2023-53825)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2025-12-09 01:29
VLAI?
Title
kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg().
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 21b467735b0888a8daa048f83d3b9b50fdab71ce (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < d4b8f380b0a041ee6a84fdac14127d8fe1dcad7b (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 1ce8362b4ac6b8e65fd04a22ea37ec776ee1ec5b (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 2e18493c421428a936946c452461b8e979088f17 (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 55d2e7c1ab8eaa7b62575b8a4194132795d1f9fc (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < e5b28ce127a690f3acc49a6a342e6c9442c9edd6 (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 992b2ac783aad360b98ed9d4686e86176a20f6f1 (git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < a22730b1b4bf437c6bbfdeff5feddf54be4aeada (git)
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    Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 4.14.326 , ≤ 4.14.* (semver)
Unaffected: 4.19.295 , ≤ 4.19.* (semver)
Unaffected: 5.4.257 , ≤ 5.4.* (semver)
Unaffected: 5.10.195 , ≤ 5.10.* (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.54 , ≤ 6.1.* (semver)
Unaffected: 6.5.4 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/kcm/kcmsock.c"
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              "version": "0",
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              "status": "unaffected",
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              "lessThanOrEqual": "6.1.*",
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        }
      ],
      "cpeApplicability": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg().\n\nsyzkaller found a memory leak in kcm_sendmsg(), and commit c821a88bd720\n(\"kcm: Fix memory leak in error path of kcm_sendmsg()\") suppressed it by\nupdating kcm_tx_msg(head)-\u003elast_skb if partial data is copied so that the\nfollowing sendmsg() will resume from the skb.\n\nHowever, we cannot know how many bytes were copied when we get the error.\nThus, we could mess up the MSG_MORE queue.\n\nWhen kcm_sendmsg() fails for SOCK_DGRAM, we should purge the queue as we\ndo so for UDP by udp_flush_pending_frames().\n\nEven without this change, when the error occurred, the following sendmsg()\nresumed from a wrong skb and the queue was messed up.  However, we have\nyet to get such a report, and only syzkaller stumbled on it.  So, this\ncan be changed safely.\n\nNote this does not change SOCK_SEQPACKET behaviour."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T01:29:38.539Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/21b467735b0888a8daa048f83d3b9b50fdab71ce"
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          "url": "https://git.kernel.org/stable/c/d4b8f380b0a041ee6a84fdac14127d8fe1dcad7b"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53825",
    "datePublished": "2025-12-09T01:29:38.539Z",
    "dateReserved": "2025-12-09T01:27:17.824Z",
    "dateUpdated": "2025-12-09T01:29:38.539Z",
    "state": "PUBLISHED"
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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