Answer in brief
CVE-2026-31657 records a Critical severity (CVSS 9.8) vulnerability in batman-adv: hold claim backbone gateways by reference. 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 9.8. 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 | >=23721387c409087fd3b97e274f34d3ddc0970b74 <5202f071b367ffbc8e279fc7a00db14f5e587f52 || >=23721387c409087fd3b97e274f34d3ddc0970b74 <69d1ce9c72eca91203ffdb8d08bacd511100aec6 || >=23721387c409087fd3b97e274f34d3ddc0970b74 <f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 || >=23721387c409087fd3b97e274f34d3ddc0970b74 <2f55b58b5a0bbed192d60c444a45a49cdf1b545f || >=23721387c409087fd3b97e274f34d3ddc0970b74 <7962b522222628596ca9ecc8722efc95367aadbd || >=23721387c409087fd3b97e274f34d3ddc0970b74 <4dee4c0688443aaf5bbec74aa203c851d1d53c35 || >=23721387c409087fd3b97e274f34d3ddc0970b74 <1f2dc36c297d27733f1b380ea644cf15a361bd7b || >=23721387c409087fd3b97e274f34d3ddc0970b74 <82d8701b2c930d0e96b0dbc9115a218d791cb0d2 | 5202f071b367ffbc8e279fc7a00db14f5e587f52, 69d1ce9c72eca91203ffdb8d08bacd511100aec6, f4858832ddef2f39f21e30b7226bbcd3c4b2bc96, 2f55b58b5a0bbed192d60c444a45a49cdf1b545f, 7962b522222628596ca9ecc8722efc95367aadbd, 4dee4c0688443aaf5bbec74aa203c851d1d53c35, 1f2dc36c297d27733f1b380ea644cf15a361bd7b, 82d8701b2c930d0e96b0dbc9115a218d791cb0d2 |
| Linux/Linuxgeneric | 3.5 | Not reported |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.
Quoted source text, attributed separately from HOL analysis.