CVE-2026-52930ipc/shm: serialize orphan cleanup with shm_nattch updates
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ipc/shm: serialize orphan cleanup with shm_nattch updates shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that does not serialize all fields tested by shm_may_destroy(). In particular, shm_nattch is updated while holding shm_perm.lock, and attach paths can do that without holding the rwsem. Do not decide that an orphaned segment is unused before taking the object lock. Move the shm_may_destroy() check under shm_perm.lock, matching the other destroy paths, and unlock the segment when it no longer qualifies for removal.
Timeline
ID reserved
By Linux
- 15 days later
· 15 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < 1f0d01e35dbb228084d5187212e32c91a30dcbeb
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < 6560be3f6a5bb84f006f184f0c966747bb58e1a3
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < db752ebfdaf2c7f27cd9690ef48b616af068319c
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < 030bbc857bd51d4b25a90d931d3f8775ef22823a
- affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – < 2e5c6f4fd4001562781e99bbfc7f1f0127187542
- affected 3.1
- unaffected < 3.1
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References11
- https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 (opens in a new tab)
- https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 (opens in a new tab)
- https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb (opens in a new tab)
- https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3 (opens in a new tab)
- https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 (opens in a new tab)
- https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c (opens in a new tab)
- https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a (opens in a new tab)
- https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-38700 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-52930)Record last updated .