CVE-2026-52924 (GCVE-0-2026-52924)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-28 06:36
VLAI
Title
sctp: purge outqueue on stale COOKIE-ECHO handling
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: purge outqueue on stale COOKIE-ECHO handling sctp_stream_update() is only invoked when the association is moved into COOKIE_WAIT during association setup/reconfiguration. In this path, the outbound stream scheduler state (stream->out_curr) is expected to be clean, since no user data should have been transmitted yet unless the state machine has already partially progressed. However, a corner case exists in sctp_sf_do_5_2_6_stale(): when a Stale Cookie ERROR is received, the association is rolled back from COOKIE_ECHOED to COOKIE_WAIT. In this scenario, user data may already have been queued and even bundled with the COOKIE-ECHO chunk. During the rollback, sctp_stream_update() frees the old stream table and installs a new one, but it does not invalidate stream->out_curr. As a result, out_curr may still point to a freed sctp_stream_out entry from the previous stream state. Later, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on stream->out_curr->ext, which can lead to use-after-free once the old stream state has been released via sctp_stream_free(). This results in crashes such as (reported by Yuqi): BUG: KASAN: slab-use-after-free in sctp_sched_fcfs_dequeue+0x13a/0x140 Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312 CPU: 1 UID: 1001 PID: 9312 Comm: mini_poc Not tainted 7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full) sctp_sched_fcfs_dequeue+0x13a/0x140 sctp_outq_flush+0x1603/0x33e0 sctp_do_sm+0x31c9/0x5d30 sctp_assoc_bh_rcv+0x392/0x6f0 sctp_inq_push+0x1db/0x270 sctp_rcv+0x138d/0x3c10 Fix this by fully purging the association outqueue when handling the Stale Cookie case. This ensures all pending transmit and retransmit state is dropped, and any scheduler cached pointers are invalidated, making it safe to rebuild stream state during COOKIE_WAIT restart. Updating only stream->out_curr would be insufficient, since queued and retransmittable data would still reference the old stream state and trigger later use-after-free in dequeue paths.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 84b7a319105db2f917ccdcf502bdc866082b1285 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 3c0741a441a7df7099d7ca6a64a6a0de09c677c8 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 2afc9e684dc7fecf73db1edc937ebbc47b4b68dc (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 1d4652f677906a64487c13f9ace54b0eb263b5d0 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < a6207349e703cfc04756a4d16dec9176135813a5 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 83ade59e5da365f4bf8bce72c5a38774202b442f (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < e374b22e9b07b72a25909621464ff74096151bfb (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: purge outqueue on stale COOKIE-ECHO handling\n\nsctp_stream_update() is only invoked when the association is moved into\nCOOKIE_WAIT during association setup/reconfiguration. In this path, the\noutbound stream scheduler state (stream-\u003eout_curr) is expected to be\nclean, since no user data should have been transmitted yet unless the\nstate machine has already partially progressed.\n\nHowever, a corner case exists in sctp_sf_do_5_2_6_stale(): when a\nStale Cookie ERROR is received, the association is rolled back from\nCOOKIE_ECHOED to COOKIE_WAIT. In this scenario, user data may already\nhave been queued and even bundled with the COOKIE-ECHO chunk.\n\nDuring the rollback, sctp_stream_update() frees the old stream table\nand installs a new one, but it does not invalidate stream-\u003eout_curr.\nAs a result, out_curr may still point to a freed sctp_stream_out\nentry from the previous stream state.\n\nLater, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on\nstream-\u003eout_curr-\u003eext, which can lead to use-after-free once the old\nstream state has been released via sctp_stream_free().\n\nThis results in crashes such as (reported by Yuqi):\n\n  BUG: KASAN: slab-use-after-free in sctp_sched_fcfs_dequeue+0x13a/0x140\n  Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312\n  CPU: 1 UID: 1001 PID: 9312 Comm: mini_poc Not tainted\n     7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full)\n   sctp_sched_fcfs_dequeue+0x13a/0x140\n   sctp_outq_flush+0x1603/0x33e0\n   sctp_do_sm+0x31c9/0x5d30\n   sctp_assoc_bh_rcv+0x392/0x6f0\n   sctp_inq_push+0x1db/0x270\n   sctp_rcv+0x138d/0x3c10\n\nFix this by fully purging the association outqueue when handling the\nStale Cookie case. This ensures all pending transmit and retransmit\nstate is dropped, and any scheduler cached pointers are invalidated,\nmaking it safe to rebuild stream state during COOKIE_WAIT restart.\n\nUpdating only stream-\u003eout_curr would be insufficient, since queued\nand retransmittable data would still reference the old stream state and\ntrigger later use-after-free in dequeue paths."
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    "datePublished": "2026-06-24T07:14:18.646Z",
    "dateReserved": "2026-06-09T07:44:35.368Z",
    "dateUpdated": "2026-06-28T06:36:46.646Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52924\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T08:16:22.430\",\"lastModified\":\"2026-06-28T08:16:24.060\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: purge outqueue on stale COOKIE-ECHO handling\\n\\nsctp_stream_update() is only invoked when the association is moved into\\nCOOKIE_WAIT during association setup/reconfiguration. In this path, the\\noutbound stream scheduler state (stream-\u003eout_curr) is expected to be\\nclean, since no user data should have been transmitted yet unless the\\nstate machine has already partially progressed.\\n\\nHowever, a corner case exists in sctp_sf_do_5_2_6_stale(): when a\\nStale Cookie ERROR is received, the association is rolled back from\\nCOOKIE_ECHOED to COOKIE_WAIT. In this scenario, user data may already\\nhave been queued and even bundled with the COOKIE-ECHO chunk.\\n\\nDuring the rollback, sctp_stream_update() frees the old stream table\\nand installs a new one, but it does not invalidate stream-\u003eout_curr.\\nAs a result, out_curr may still point to a freed sctp_stream_out\\nentry from the previous stream state.\\n\\nLater, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on\\nstream-\u003eout_curr-\u003eext, which can lead to use-after-free once the old\\nstream state has been released via sctp_stream_free().\\n\\nThis results in crashes such as (reported by Yuqi):\\n\\n  BUG: KASAN: slab-use-after-free in sctp_sched_fcfs_dequeue+0x13a/0x140\\n  Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312\\n  CPU: 1 UID: 1001 PID: 9312 Comm: mini_poc Not tainted\\n     7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full)\\n   sctp_sched_fcfs_dequeue+0x13a/0x140\\n   sctp_outq_flush+0x1603/0x33e0\\n   sctp_do_sm+0x31c9/0x5d30\\n   sctp_assoc_bh_rcv+0x392/0x6f0\\n   sctp_inq_push+0x1db/0x270\\n   sctp_rcv+0x138d/0x3c10\\n\\nFix this by fully purging the association outqueue when handling the\\nStale Cookie case. This ensures all pending transmit and retransmit\\nstate is dropped, and any scheduler cached pointers are invalidated,\\nmaking it safe to rebuild stream state during COOKIE_WAIT restart.\\n\\nUpdating only stream-\u003eout_curr would be insufficient, since queued\\nand retransmittable data would still reference the old stream state and\\ntrigger later use-after-free in dequeue paths.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/sm_statefuns.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"84b7a319105db2f917ccdcf502bdc866082b1285\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"3c0741a441a7df7099d7ca6a64a6a0de09c677c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"2afc9e684dc7fecf73db1edc937ebbc47b4b68dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"1d4652f677906a64487c13f9ace54b0eb263b5d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"a6207349e703cfc04756a4d16dec9176135813a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"83ade59e5da365f4bf8bce72c5a38774202b442f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\",\"lessThan\":\"e374b22e9b07b72a25909621464ff74096151bfb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/sm_statefuns.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1d4652f677906a64487c13f9ace54b0eb263b5d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2afc9e684dc7fecf73db1edc937ebbc47b4b68dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c0741a441a7df7099d7ca6a64a6a0de09c677c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83ade59e5da365f4bf8bce72c5a38774202b442f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84b7a319105db2f917ccdcf502bdc866082b1285\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6207349e703cfc04756a4d16dec9176135813a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e374b22e9b07b72a25909621464ff74096151bfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.