CVE-2025-71304smack: /smack/doi: accept previously used values
- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% 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: smack: /smack/doi: accept previously used values Writing to /smack/doi a value that has ever been written there in the past disables networking for non-ambient labels. E.g. # cat /smack/doi 3 # netlabelctl -p cipso list Configured CIPSO mappings (1) DOI value : 3 mapping type : PASS_THROUGH # netlabelctl -p map list Configured NetLabel domain mappings (3) domain: "_" (IPv4) protocol: UNLABELED domain: DEFAULT (IPv4) protocol: CIPSO, DOI = 3 domain: DEFAULT (IPv6) protocol: UNLABELED # cat /smack/ambient _ # cat /proc/$$/attr/smack/current _ # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.964 ms # echo foo >/proc/$$/attr/smack/current # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.956 ms unknown option 86 # echo 4 >/smack/doi # echo 3 >/smack/doi !> [ 214.050395] smk_cipso_doi:691 cipso add rc = -17 # echo 3 >/smack/doi !> [ 249.402261] smk_cipso_doi:678 remove rc = -2 !> [ 249.402261] smk_cipso_doi:691 cipso add rc = -17 # ping -c1 10.1.95.12 !!> ping: 10.1.95.12: Address family for hostname not supported # echo _ >/proc/$$/attr/smack/current # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.617 ms This happens because Smack keeps decommissioned DOIs, fails to re-add them, and consequently refuses to add the “default” domain map: # netlabelctl -p cipso list Configured CIPSO mappings (2) DOI value : 3 mapping type : PASS_THROUGH DOI value : 4 mapping type : PASS_THROUGH # netlabelctl -p map list Configured NetLabel domain mappings (2) domain: "_" (IPv4) protocol: UNLABELED !> (no ipv4 map for default domain here) domain: DEFAULT (IPv6) protocol: UNLABELED Fix by clearing decommissioned DOI definitions and serializing concurrent DOI updates with a new lock. Also: - allow /smack/doi to live unconfigured, since adding a map (netlbl_cfg_cipsov4_map_add) may fail. CIPSO_V4_DOI_UNKNOWN(0) indicates the unconfigured DOI - add new DOI before removing the old default map, so the old map remains if the add fails (2008-02-04, Casey Schaufler)
Timeline
ID reserved
By Linux
- 19 days later
· 19 days later
Published
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 · Analyzed | 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)
- 0.16% · top 95% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < eb718a3c8181ada679340db34cd61bce48e44749
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 6ec091c5c7eeabd249a7c46813cad1e9f555f859
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 199452f22d2f74b897fe826f81ec402b0a8461a0
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < f8071500177f38cff38892bd85ac631cc6e010b2
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 5a247a84de0ba44edbbd6be851c8a6b2aa60ff85
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 8beebb8ad9a003f978e53b06237986588223e15e
- affected e114e473771c848c3cfec05f0123e70f1cdbdc99 – < 33d589ed60ae433b483761987b85e0d24e54584e
- affected 2.6.25
- unaffected < 2.6.25
- unaffected 5.10.252 – ≤ 5.10.*
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.14 – ≤ 6.18.*
- unaffected 6.19.4 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/eb718a3c8181ada679340db34cd61bce48e44749 (opens in a new tab)
- https://git.kernel.org/stable/c/6ec091c5c7eeabd249a7c46813cad1e9f555f859 (opens in a new tab)
- https://git.kernel.org/stable/c/199452f22d2f74b897fe826f81ec402b0a8461a0 (opens in a new tab)
- https://git.kernel.org/stable/c/1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3 (opens in a new tab)
- https://git.kernel.org/stable/c/f8071500177f38cff38892bd85ac631cc6e010b2 (opens in a new tab)
- https://git.kernel.org/stable/c/5a247a84de0ba44edbbd6be851c8a6b2aa60ff85 (opens in a new tab)
- https://git.kernel.org/stable/c/8beebb8ad9a003f978e53b06237986588223e15e (opens in a new tab)
- https://git.kernel.org/stable/c/33d589ed60ae433b483761987b85e0d24e54584e (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-2025-209968 (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-2025-71304)Record last updated .