Answer in brief
CVE-2025-71304 records a Medium severity (CVSS 5.5) vulnerability in smack: /smack/doi: accept previously used values. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-71304 records a Medium severity (CVSS 5.5) vulnerability in smack: /smack/doi: accept previously used values. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <eb718a3c8181ada679340db34cd61bce48e44749 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <6ec091c5c7eeabd249a7c46813cad1e9f555f859 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <199452f22d2f74b897fe826f81ec402b0a8461a0 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <f8071500177f38cff38892bd85ac631cc6e010b2 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <5a247a84de0ba44edbbd6be851c8a6b2aa60ff85 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <8beebb8ad9a003f978e53b06237986588223e15e || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <33d589ed60ae433b483761987b85e0d24e54584e | eb718a3c8181ada679340db34cd61bce48e44749, 6ec091c5c7eeabd249a7c46813cad1e9f555f859, 199452f22d2f74b897fe826f81ec402b0a8461a0, 1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3, f8071500177f38cff38892bd85ac631cc6e010b2, 5a247a84de0ba44edbbd6be851c8a6b2aa60ff85, 8beebb8ad9a003f978e53b06237986588223e15e, 33d589ed60ae433b483761987b85e0d24e54584e |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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)
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <eb718a3c8181ada679340db34cd61bce48e44749 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <6ec091c5c7eeabd249a7c46813cad1e9f555f859 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <199452f22d2f74b897fe826f81ec402b0a8461a0 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <f8071500177f38cff38892bd85ac631cc6e010b2 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <5a247a84de0ba44edbbd6be851c8a6b2aa60ff85 || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <8beebb8ad9a003f978e53b06237986588223e15e || >=e114e473771c848c3cfec05f0123e70f1cdbdc99 <33d589ed60ae433b483761987b85e0d24e54584e | eb718a3c8181ada679340db34cd61bce48e44749, 6ec091c5c7eeabd249a7c46813cad1e9f555f859, 199452f22d2f74b897fe826f81ec402b0a8461a0, 1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3, f8071500177f38cff38892bd85ac631cc6e010b2, 5a247a84de0ba44edbbd6be851c8a6b2aa60ff85, 8beebb8ad9a003f978e53b06237986588223e15e, 33d589ed60ae433b483761987b85e0d24e54584e |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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)
Quoted source text, attributed separately from HOL analysis.