net/smc: unregister the connection before draining the rx tasklet

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80979
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:04 UTC
Updated2026-09-14 13:18:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/smc: unregister the connection before draining the rx tasklet smc_conn_free() calls smc_ism_unset_conn() only while the link group is still on its device list, and never sets conn->killed. smc_lgr_terminate_sched() unlinks the group immediately and defers killing its connections to a work item, so a connection freed in that window keeps its smcd->conn[] slot with both gates in smcd_handle_irq() open, and the device can re-arm the receive tasklet after tasklet_kill() has returned. On the DMB-nocopy path the ghost send buffer is freed right after that drain, so the re-armed tasklet dereferences it. Unregister unconditionally and drain before the detach at both teardown sites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain. Clear conn->sndbuf_desc before freeing it as well, so a reader that samples the pointer cannot get one that is already freed.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001280000 probability, percentile 0.028270000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd b6b6ac713ee82b340a8e3be30b101bd2840deec4 git Not specified
CNA Linux Linux affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5 git Not specified
CNA Linux Linux affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa 5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3 git Not specified
CNA Linux Linux affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa b74d313567dfc1b7e56629ddbad04e728686f235 git Not specified
CNA Linux Linux affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa 36cdf5d48ca191dcd71c28cadbe0981b1d25318d git Not specified
CNA Linux Linux affected 6.6.66 6.6.157 semver Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b74d313567dfc1b7e56629ddbad04e728686f235 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6b6ac713ee82b340a8e3be30b101bd2840deec4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36cdf5d48ca191dcd71c28cadbe0981b1d25318d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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