Answer in brief
CVE-2021-47291 records a High severity (CVSS 7.8) vulnerability in ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions. 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 7.8. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.3 | Not reported |
| Linux/Linuxgeneric | >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <830251361425c5be044db4d826aaf304ea3d14c6 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <ce8fafb68051fba52546f8bbe8621f7641683680 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <115784bcccf135c3a3548098153413d76f16aae0 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <8fb4792f091e608a0a1d353dfdf07ef55a719db5 | 830251361425c5be044db4d826aaf304ea3d14c6, ce8fafb68051fba52546f8bbe8621f7641683680, 115784bcccf135c3a3548098153413d76f16aae0, 8fb4792f091e608a0a1d353dfdf07ef55a719db5 |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions While running the self-tests on a KASAN enabled kernel, I observed a slab-out-of-bounds splat very similar to the one reported in commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions"). We additionally need to take care of fib6_metrics initialization failure when the caller provides an nh. The fix is similar, explicitly free the route instead of calling fib6_info_release on a half-initialized object.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47291 records a High severity (CVSS 7.8) vulnerability in ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions. 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 7.8. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.3 | Not reported |
| Linux/Linuxgeneric | >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <830251361425c5be044db4d826aaf304ea3d14c6 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <ce8fafb68051fba52546f8bbe8621f7641683680 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <115784bcccf135c3a3548098153413d76f16aae0 || >=f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 <8fb4792f091e608a0a1d353dfdf07ef55a719db5 | 830251361425c5be044db4d826aaf304ea3d14c6, ce8fafb68051fba52546f8bbe8621f7641683680, 115784bcccf135c3a3548098153413d76f16aae0, 8fb4792f091e608a0a1d353dfdf07ef55a719db5 |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions While running the self-tests on a KASAN enabled kernel, I observed a slab-out-of-bounds splat very similar to the one reported in commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions"). We additionally need to take care of fib6_metrics initialization failure when the caller provides an nh. The fix is similar, explicitly free the route instead of calling fib6_info_release on a half-initialized object.
Quoted source text, attributed separately from HOL analysis.